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The
Dornier Do 17, sometimes referred to as the
Fliegender Bleistift ("flying pencil"), was a World War II German light bomber produced by Claudius Dornier's company, Dornier Flugzeugwerke. It was designed as a
Schnellbomber ("fast bomber"), a light bomber which, in theory, would be so fast that it could outrun defending fighter aircraft.
The Dornier was designed with two engines mounted on a "shoulder wing" structure and possessed a twin tail fin
configuration. The type was popular among its crews due to its
handling, especially at low altitude, which made the Do 17 harder to hit
than other German bombers.
Designed in the early 1930s, it was one of the three main
Luftwaffe bomber types used in the first three years of the war. The Do 17 made its combat debut in 1937 during the Spanish Civil War, operating in the Condor Legion in various roles. Along with the Heinkel He 111
it was the main bomber type of the German air arm in 1939–1940. The
Dornier was used throughout the early war, and saw action in significant
numbers in every major campaign theatre as a front line aircraft until
the end of 1941, when its effectiveness and usage was curtailed as its
bomb load and range were limited.
Production of the Dornier ended in the summer of 1940, in favour of the newer and more powerful Junkers Ju 88. The successor of the Do 17 was the much more powerful Dornier Do 217,
which started to appear in strength in 1942. Even so, the Do 17
continued service in the Luftwaffe in various roles until the end of the
war, as a glider tug, research and trainer aircraft. A considerable number of surviving examples were sent to other Axis nations as well as countries like Finland. Few Dornier Do 17s survived the war and the last was scrapped in Finland in 1952.
On 3 September 2010, the Royal Air Force Museum London announced the discovery of a Henschel-built Dornier Do 17Z buried in the Goodwin Sands off the coast of Kent, England. On 10 June 2013, the salvage team successfully raised the airframe from the seabed.
Do 17 |
|
A formation of Dornier Do 17Zs, circa 1940 |
Role |
Light bomber, night fighter and Reconnaissance aircraft |
Manufacturer |
Dornier Flugzeugwerke |
First flight |
23 November 1934[1] |
Introduction |
1937 |
Retired |
15 September 1952 (Finnish Air Force)[2] |
Primary users |
Luftwaffe
Royal Yugoslav Air Force
Finnish Air Force
Spanish Air Force |
Number built |
2,139[3] |
Variants |
Dornier Do 215 |
Development
In 1932, the Ordnance Department (
Heereswaffenamt) issued a specification for the construction of a "freight aircraft for German State Railways", and a "high speed mail plane for Lufthansa".
[1] The factory at Friedrichshafen began work on the design on 1 August 1932.
[1]
When the Nazis took power in 1933, Hermann Göring became National Commissar for aviation with former Deutsche Luft Hansa employee Erhard Milch as his deputy, soon forming the Ministry of Aviation. The Ministry of Aviation designated the new aircraft
Do 17, and on 17 March 1933, just three months after taking office, Milch gave the go ahead for the building of prototypes.
At the end of 1933, the Ministry of Aviation issued an order for a
"high speed aircraft with double tail," and for a "freight aircraft with
special equipment," in other words, a bomber. The original design (the
Do 17 V1) configuration in 1932 had sported a single vertical stabilizer,
and Dornier continued developing that model. The Do 17 was first
demonstrated in mock-up form in April 1933. The "special equipment" was
to be fitted later, to disguise its offensive role.
[4]
In April 1934, the Dornier works at Manzell
began project "definition." During this month, the defensive armament
was designed and the bomb release mechanism details ironed out.
Production of these prototypes began on 20 May 1934 and, on 23 November
1934, the Do 17 V1, with a single fin and powered by two BMW VI
7.3 motors, took off on its first flight. Testing was delayed by a
series of accidents, with V1 being damaged in landing accidents in
February and April 1935. The twin-tailed V2 (powered by low-compression
BMW VI 6.3 engines) first flew on 18 May 1935 and was evaluated together
with the V1 by the Ministry of Aviation at Rechlin
in June. During the tests, the single fin proved to be only marginally
stable, resulting in the V1 being modified with a twin tail. The
aircraft was destroyed in a crash after an engine failure on 21 December
1935.
[5] The V3, also fitted with a twin tail, was originally planned to be powered by Hispano-Suiza 12Ybrs engines, but as these were unavailable, it was fitted with BMW VI 7.3 engines like the V1 and flew on 19 September 1935.
[6] The V1 prototype remained the only built machine with the single stabilizer.
[4]
It is claimed that, unlike the Heinkel He 111 series, whose military use was planned from the start, the Do 17 V1 was contracted as a fast six-passenger mail plane to compete with the smaller Heinkel He 70 monoplane
[7] It has been suggested that it was rejected by Luft Hansa, as the cramped cabin was too uncomfortable for passenger use and the operating costs also were too high for a mail plane.
[8]
According to the story, the three prototypes remained unused in the
Dornier factory in Lowental for almost six months, until Flight Captain
Untucht of Luft Hansa came across them. After receiving permission to
fly one of the machines, he proceeded to put it through an almost stunt
flying routine. After landing, he said that "the machine is as nimble as
a fighter, give it more lateral stability and we'll have a high speed
bomber!" Untucht's comments prompted Dornier to redesign the tail unit
and revived interest in the type.
[9]
Dornier was then ordered to produce the V4 prototype. Some sources
state this differed from the V3 in that the passenger portholes were
removed and the single fin was replaced with two smaller ones.
[10][11] Photographic evidence demonstrates the V3 had twin stabilizers from the start of its construction.
[12]
The tests of the "twin-tailed" V4, V6 and V7 prototypes were positive
and more prototypes like the V8 emerged as the forerunner of the
long-range reconnaissance version, while the V9 was tested as a high-speed airliner.
[13] The V9 machine was still flying in 1944.
[10]
Design
Dornier Do 17Z 3-view drawing
The cockpit and forward fuselage had a conventional stepped cockpit,
and its nose was fully glazed. Early variants had been labelled the
"flying pencil" owing to its sleek and continuous "stick-like" lines. As
a result of the lessons learned in the Spanish Civil War,
the cockpit roof was raised and the lower, or bottom half, of the crew
compartment was a typical under-nose "Bodenlafette", abbreviated
Bola, inverted-casemate design ventral defensive armament position, a common feature of most German medium bombers. The
Bola
was extended back to the leading edge of the wings where the lower-rear
gunners position and upper-rear gunner position were level with each
other.
[14]
As with contemporary German bombers, the crew were concentrated in a
single compartment. The cockpit layout consisted of the pilot seat and
front gunner in the forward part of the cockpit. The pilot sat on the
left side, close up to the Plexiglas windshield. One of the gunners sat
on the right seat, which was set further back to provide room for the
7.92 mm (0.312 in) MG 15 machine gun
to be traversed in use. The Do 17 usually carried a crew of four: the
pilot, a bombardier and two gunners. The bomb-aimer also manned the MG
15 in the nose glazing and
Bola-housed rear lower position. The
two gunners operated the forward-firing MG 15 installed in the front
windshield, the two MGs located in the side windows (one each side) and
the rearward firing weapon. The cockpit offered a bright and panoramic
view at high altitude.
[15][Notes 1] The standard ammunition load was 3,300 rounds of 7,92 mm ammunition in 44 double-drum magazines.
[17]
The wings were of a broad 55 m² (590 ft²) area and had a span of 18 m
(59 ft 0⅝ in) with a flat leading edge which curved in a near-perfect
semicircle into the trailing edge. The positions of the wing roots were
offset. The leading edge wing root merged with the top of the fuselage
and cockpit. As the wing extended backwards, by roughly two-third, it
declined downwards at a sharp angle so that the trailing edge wing root
ended nearly halfway down the side of the fuselage increasing the angle of attack.
[18] This design feature was used on all future Dornier bomber designs, namely the Dornier Do 217.
[19] The trailing edge was faired into the round fuselage shape. The engine nacelle was also faired into the flaps.
The extreme rear of the nacelle was hollow and allowed the flap with an
attached vertical slot to fit into the cavity when deployed.
[20]
The fuselage was 15.80 m (51 ft 9⅝ in) long. It was thin and narrow,
which presented an enemy with a difficult target to hit. The fuselage
had twin vertical stabilizers to increase lateral stability. The power
plant of the Z-1 was to have been the Daimler-Benz DB 601 but, owing to shortages from priority allocation for Bf 109E and Bf 110 fighter production, it was allocated Bramo 323
A-1 power plants. The Bramos could only reach 352 km/h (220 mph) at
1,070 m (3,500 ft). The limited performance of the Bramo 323s ensured
the Do 17 could not reach 416 km/h (260 mph) at 3,960 m (13,000 ft) in
level flight when fully loaded.
[21]
The range of the Do 17Z-1 at ground level was 635 nmi (1,176 km); this
increased to 1,370 km (850 nm) at 4,700 m (15,500 ft). This gave an
average attack range of 400 nmi (740 km). The introduction of the Bramo
323P increased the Z-2 performance slightly in all areas.
[21]
The Dornier had self-sealing fuel tanks
to protect fuel stored in the wings and fuselage. This reduced the loss
of fuel and risk of fire when hit in action, and often enabled the
aircraft to return. Twenty oxygen bottles were provided for crew use
during long flights above 3,660 m (12,000 ft).
[17]
Communications usually consisted of FuG X, the later FuG 10 (
Funkgerät), navigational direction finder
PeilG V direction finder (PeilG -
Peilgerät) and the FuG 25 IFF and FuBI 1 blind-landing devices. The crew communicated by EiV intercom.
[17] A primitive autopilot device, the Siemens K4Ü, was installed and could maintain bearing using the rudder's control surfaces.
[17]
The bomb bay accommodated four bomb racks, the No. 5 for SC50 bombs
and two ETC 500 racks to carry heavier loads of up to 500 kg (1,100 lb)
each. A
Lotfe A, or B bombsight was issued together with the BZA-2 aperture (a modernised optical lens system).
[17]
The aircraft's bomb bay allowed two options. The first was to carry
four 250 kg (550 lb) bombs for a load of 1000 kg (2,200 lb), which
reduced aircraft range. With half the maximum load, ten 50 kg (110 lb)
bombs, additional fuel tanks could be placed into the forward part of
the bomb bay to increase range. The bomb aimer
would deploy the bomb load via the Lotfe (A, B or C 7/A, depending on
the variant) bomb sight which was in the left side of the nose
compartment directly under and forward of the pilot.
[22] When fully loaded, the Z-1 weighed 7,740 kg (17,200 lb).
[21]
Variants
Early Daimler-Benz-powered variants
The initial production variants were the Do 17E-1 bomber, which was tested with two Daimler-Benz DB 600,
[13]
and Do 17F-1 reconnaissance aircraft, powered like the early prototypes
with BMW VI engines, which entered production in late 1936. The first
Luftwaffe units converted to the Do 17 in early 1937.
[23]
The
Do 17E-1 was equipped with two BMW VI 7.3D inline engines of 750 PS each. The crew numbered three. The radio operator manned the two 7.92 mm MG 15 machine guns
within a B-Stand pod in the rear cockpit. They had 750 rounds of
ammunition. The bomb bay was divided into two compartments. Each had
five bomb racks with individual capacity of 50 kg (110 lb). A single ETC
500/IX bomb rack could be mounted externally underneath the aircraft to
carry a 500 kg bomb. A Do 17 E-1 with the designation D-AJUN was tested
with an unusual configuration, two SC 500 bombs mounted side by side under the fuselage.
[Notes 2]
It showed a notable performance reduction due to the increase in weight
and drag, this configuration was not used operationally. The E-1
continued to carry low bomb loads into the Second World War.
The performance of the E-1 enabled it to reach a speed of 330 km/h
(205 mph) at 3,000 m (9,842 ft). Conducting a shallow dive the light
frame of the Do 17 could reach 500 km/h (310 mph). Its maximum ceiling
was 5,500 m (18,044 ft).
Several E-1s were rebuilt as E-2 or E-3, at least three E-2 and one
E-3 were used by DVL and Hansa-Luftbild GmbH (Hansa Aerial Photography
Ltd) in a secret military reconnaissance role prior to the war.
[24]
The
Do 17F-1 was a long-range reconnaissance aircraft based on
field modified Do 17Es. The Do 17 prototype V8 was used to test the
configuration of the F-1 and V11 for the F-2. The defensive armament
consisted of a MG 15 in the B- and C-Stand (B-Stand - an upper rear
firing position, C-Stand — lower gun emplacement). The fuselage had two
cameras along with six ejector tubes for flashlight cartridges. The F-1
would see service until replaced by the Do 17 P in 1938. Only one F-2
was ever built, it was designated D-ACZJ and was used by Zeiss-Jena
Company as a factory aircraft.
[24]
Conversion of two E-2 series aircraft with two BMW 132F radial engines led to the
Do 17 J-1
and J-2. These aircraft served as flight testing machines to evaluate
the BMW 132 for usage in the Do 17. The aircraft were the V18 (
Wrk Nr, or
Werknummer
meaning works/factory number, 2021) and V19 (Wrk Nr 2022) prototypes.
Trials began in late 1937. A similar conversion, but with Bramo 323
radial engines, led to the designation Do 17 L-1 and L-2. Two Do 17
(Wrk Nr 2031 and 2032) were renamed as V20 and V21 prototypes and used
to evaluate the Bramo 323 fur usage in the Do 17. The test were
satisfactory and all future production models would be equipped with
this engine.
[24]
After seeing the Do 17M V1 at the Zürich air races in 1937, the Yugoslav Royal Air Force bought license rights for production at the
Drzavna Fabrika Aviona factory in 1938. They equipped it with the more powerful Gnome-Rhône 14N radial engine (although the French exaggerated its performance)
[25] Dornier designs were delivered to the
Pomorsko Vazduhoplovstvo (Naval Aviation - PV) in 1926, namely the Dornier Komet and Dornier Do Y
heavy bombers. The Yugoslavs were familiar with Dornier designs, and on
19 November 1935 Yugoslav pilots test-flew the Do 17 V-3 prototype,
D-ABIH, W.Nr. 258. They decided to select the Do 17 for service, despite
it being more expensive than any other aircraft, because of the German
willingness to deliver them quickly without limitations on numbers.
[26]
The
Do 17L-0 and
Do 17M-0 were developed in parallel as
replacements for the earlier E and Fs, the L being the reconnaissance
version. Both were designed around the more powerful DB 600A engines,
delivering about 746 kW (1,000 hp). Two L and one M versions were built
as prototypes, both with another MG 15 in the nose.
[27]
The first prototype of the revised version, the Do 17M V1 (D-ABVD) was
powered by two DB 600s, and demonstrated impressive performance,
including a maximum speed of 425 km/h (264 mph).
[28]
At the International Military Aircraft Competition at Zürich, Switzerland in 1937, the Dornier Do 17M V1 proved a leader in its class and was faster than the fastest foreign fighter, the French Dewoitine D.510.
[9] The Do 17, along with the Messerschmitt Bf 109, won many prizes, demonstrating the prowess of German aviation design.
[13][29]
The radial variants
Despite its success, owing to shortages in the supply of the Daimler-Benz engine, the production Do 17M was fitted with the Bramo 323 engine,
[30] with the corresponding reconnaissance aircraft, the Do 17P, being powered by BMW 132Ns to give better range.
[31]
The supply of the DB 600 remained extremely limited as production was
soon switched over to the fuel-injected DB 601, which was reserved for
the Messerschmitt Bf 109 and Messerschmitt Bf 110 fighters. Therefore production versions of the basic Do 17M model airframe were fitted with the new Bramo 323A-1 Fafnir engines of 670 kW (900 hp), which gave reasonable performance and raised the bomb load to 1,000 kg (2,200 lb). The resulting
Do 17M-1 was produced in small numbers and operated until 1941.
[32]
The prototypes for the M-1 series were Do 17M V1 (Wrk Nr 691) and Do
17M V2 (Wrk Nr 692) which were tested with bomb loads of a medium
bomber. The third prototype, Do 17M V3 was evaluated as a fast bomber.
The MV1 was fitted with two Daimler Benz DB 601 inline engines while the
MV2 and MV3 had the Bramo 323 A and D respectively. The Ministry of
Aviation favoured the widespread use of the DB 601, but demand for the
DB 601s in fighter aircraft and the lack of production forced the use of
the Bramo.
[33]
The Do 17M-1 started its service as a medium bomber and was able to
carry 2,200 lb (1,000 kg) of bombs. It was equipped with two air-cooled
Bramo 323 A-1 or A-2. The defensive armament consisted of two, and
later three, MG 15 machine guns. The first was operated in an A-Stand
pod operated by the navigator through the windshield. The position was
allocated 370 rounds of ammunition. The rearward firing B-Stand was
operated by the radio operator and allocated 750 rounds. The rear
position in the lower fuselage was allocated 375 rounds in a C-Stand
pod. The Do 17M could carry a bomb load of either 20 SC50 50 kg (110 lb)
or two SC250
250 kg (550 lb) bombs or 10 SC50 and a single SC250 bomb. The speed of
the M was superior to that of the E variant. The Do 17M could reach
420 km/h (250 mph) at altitudes of 3,500 m (11,500 ft) and could achieve
a maximum service ceiling of 5,790 m (19,000 ft) and a range of 850
nautical miles (1,570 km).
[33]
Reconnaissance aircraft based on the M-1, the under-surfaces of the wing were covered with duralumin
and it had a wider engine axis and longer engine nacelles. The demand
for a reconnaissance aircraft based on the M-1 led to the development of
the P-1 variant.
[34]
The L version would not be able to enter production with the DB 600
owing to its use in the Bf 109, and the Bramo engine was rather thirsty
on fuel and left the M models with too short a range for reconnaissance
use. BMW 132N
radials of 865 PS were selected instead, which had lower fuel
consumption for better range. Another two prototypes with DB 600 engines
were produced as the
Do 17R-0, but did not enter production.
During reconnaissance missions the P-1 was armed with four MG 15s in the
A, B and C—Stands. One machine gun was located in the rear of the
cockpit, another in the lower rear
Bola mount, one facing forward through the windscreen and the other in the nose glazing.
[35]
In earlier variants the B-Stand (the gun position in the upper rear
cockpit) was open to the elements, but the P-1 now provided an enclosed
bulb-shaped mount protecting the radio operator from the weather.
[36]
The P variant had similar features to the Do 17M-1, with added blind flying and camera equipment for reconnaissance work. The
Do 17P-1
was powered by two Bramo 132 N radial engines with a maximum
performance of 865 PS (853 hp, 636 kW) each. The machine was fitted with
several radio variations. The FuG IIIaU radio (
Funkgerät), the PeilG V direction finder (PeilG -
Peilgerät) and the FuBI 1 radio blind-landing device (FuBI -
Funkblindlandegerät).
[33] The crew of three communicated with each other via the EiV intercom (EiV -
Eigenverständigungsanlage).
[33]
The P-1 was equipped with either Rb 20/30 and Rb 50/30 or Rb 20/18 and
Rb 50/18 cameras. The P-1/trop was fitted with filters and protection
for the cameras.
[37] The cameras were controlled remotely by the crew from the cockpit.
[36]
Due to a shortage of night fighters, at least one Do 17P-1 was
assigned to this role. A smooth metal sheet was installed in place of
its glass nose and it was armed with three 20 mm (0.79 in) MG 151/20 cannons. The machine operated under
Luftflotte 1.
[38]
The
Do 17P-2 was identical to the P-1, with the additional
installation of an ETC 500 bomb rack under the fuselage. These aircraft
were designed for night reconnaissance. It is assumed that Dornier
converted most, if not all, P-2 models from existing P-1 production
aircraft.
[33]
Unlike the P-2, the
Do 17R-1 did not see series production. The experiences of the Spanish Civil War proved that unarmed aircraft were easy prey for fighter aircraft.
The R-1 was to be a fast long-range reconnaissance aircraft with two
additional fuel cells inside the fuselage aft of the bomb bay. Two
variants were suggested, the first (variant I) had a single Rb 50/30 and
two Rb 20/30 cameras, while variant II had a third fuel cell to replace
the rear Rb 20/30. The aircraft had a gross weight of 7,250 kg
(15,980 lb) but could be overloaded to 7,500 kg (16,500 lb) in
emergencies. The crew usually numbered three, but a fourth was added
depending on the missions to be flown.
[33]
To achieve a high performance at increased altitudes two DB 600 Gs were
to be used. The power plants were tested in the Do 17RV1 prototype
registered D-ABEE. The second, the RV2, registered D-ATJU, received the
even more powerful DB 601 Aa engines.
[21] The power plant of the R-1s that did exist are not known.
[3]
The lessons from the Spanish Civil War had led Dornier's designers to incorporate more defensive machine guns. Battles with Soviet-built fighter aircraft had demonstrated that the Dornier was not as fast and invulnerable as was first thought.
[21]
To cope with this, a completely new pod-like cockpit was designed to
give the crew more room and better visibility. The roof was extended
upward over the line of the fuselage, sloping down to meet it just in
front of the wing. The dorsal gun was moved to the rear of the pod where
it had a considerably better field of fire. Likewise, the floor was
dropped under the fuselage as a
Bola casemate-style defensive armament emplacement, and the ventral gun moved to the back of the
Bola,
allowing it to fire directly to the rear. The changes in the roof and
floor made the whole front of the aircraft much larger. The rest of the
airframe remained the same. The new cockpit design was nicknamed
Kampfkopf (German: "Battle head").
[21]
Three S variant prototypes with the DB 600 G inline engines were tested. The S-01 (designation D-AFFY), 03 and 04 were flown.
[21] The inverted V-12 engines were constructed as the
Do 17 S-0 reconnaissance version, but it did not go into production. An additional 15
Do 17 U-1 pathfinder models were built, similar to the S-0 but adding another crewman (taking the total to five) to operate the extra radio
equipment. The U models were to fly ahead of other bombers on night
missions, using the radio equipment to locate the target and drop flares
on it. They were personally requested by KG 100 as experimental models
for this role. The U-1 had a maximum speed of 265 mph (424 km/h) and a
combat ceiling of 4,500 m (15,000 ft). The U-1 had a cruising speed of
384 km/h (240 mph) and a maximum reachable height of 5,700 m
(19,000 ft), owing to the "rather low performance of the Bramo 323 A-1
engines". The three prototypes (U-01 - U-03) and twelve production
aircraft were built by 1938.
[21]
Two Do 17Zs in a maintenance hangar. The detached Bramo 323s power plants can be seen.
Dornier Do 17Z: The main variant
The Dornier Do 17Z series was the most recognised and mass-produced
variant, and saw more combat service than the E-U types. The type was
modified as a result of combat experience during the Spanish Civil War.
The forward fuselage
was redesigned, with the cockpit area being "dropped", or extended
further to enable a rear firing gunner position to be installed, and the
canopy extended aft, until it was nearly parallel with the leading edge and wing root.
To test the design, the Do 17S and Do 17U were produced, both to be
powered by the DB 600 power plants. However, a call for all DB 600
series engines to be reserved for fighters led to the variants being
fitted with Bramo Fafnir 323 A radial engines. The bomb load was
increased to 1,000 kg (2,200 lb) and a fourth crew member was added. It
proved to be underpowered, so Bramo 323 P engines were then fitted. Only
three Do 17S and 15 Do 17Us were built.
With the updates, the Dornier, with a full bomb load, had a combat
radius of 322 km (200 mi). Later variants, in the Do 17 Z-3, Z-4 and
Z-5, which were fitted with cameras, dual trainer controls and flotation
aids (for maritime operations) respectively, still could not solve the
problems with range and bomb load.
[14]
At first, a batch of
Z-0s were built with the Fafnir for
testing, the DB 600 again proving to be too hard to obtain. These were
quickly replaced with the
Z-1 model, which added another gun for
the bombardier, but the additional weight of the nose and guns meant the
bomb load was reduced to 500 kg (1,100 lb). The Luftwaffe, not being
satisfied with the test outcome of the Z series, immediately ordered
performance and design studies to increase the overall performance of
the bomber. These resulted in very optimistic speeds and altitudes for
all future Z variants, especially for the Z-5 aircraft. Planned
performance altitudes of up to 7,620 m (25,000 ft) at a maximum speed of
418 km/h (260 mph) with an aircraft weight of 8,100 kg (17,800 lb) were
planned. Unfortunately, production aircraft never reached these
optimistic performances during the service career of the Do 17Z. At
7,740 kg (17,200 lb), the heavy Do 17Z-1 used two Bramo 323 A-1 engines
with self-sealing fuel cells in the fuselage and wings. The crew of four
consumed approximately 20 bottles of oxygen during long flights above
3,700 m (12,100 ft). The Do 17Z-1 had a speed of 352 km/h (220 mph) at
1,100 m (3,500 ft). However, the performance of the Bramo 323s did not
permit the Do 17 to reach 416 km/h (260 mph) at 3,900 m (13,000 ft) and
level flight when fully loaded. Range of the Z-1 at ground level was
635 nmi (1,176 km) while at 4,700 m (15,500 ft) this increased to
850 nmi (1,570 km). This gave an average range of 400 nmi (740 km). The
introduction of the Bramo 323P increased subsequent performance in the
following sub variants.
[21]
This was addressed in the major production model, the
Do 17 Z-2.
The Z-2 mounted the new 323P-1 version of the Fafnir with 746 kW
(1,000 hp), which was specifically tuned to the performance needs of the
Do 17 by decreasing supercharger
power at lower altitudes and thus improving low-level performance. The
increase in takeoff power allowed the bomb load to be increased from
500 kg (1,102 lb) to 1,000 kg (2,200 lb).
[13] However the combat range with a full 1,000 kg (2,200 lb) bomb load was a very short 330 km (200 mi).
[14]
The armament was further upgraded by adding another pair of guns firing
out of the sides of the upper part of the pod, but as the three guns
were all fired by a single gunner, only one of them could be fired at a
time. From May 1940, 422 Do 17 Z-2s flew with
Kampfgeschwader 2,
Kampfgeschwader 3,
Kampfgeschwader 76 and
Kampfgeschwader 77.
[13] The upgrades of the Z-2 had its overall weight increased from 17,600 lbs to 17,920 lbs (7,983 to 8128 kg).
[17] After heavy losses of Do 17s during the Battle of Britain it was decided to replace the MG FF cannon with the more powerful MG 151/15. Losses had mounted in spite of an increase of up to eight machine guns in some Dornier's.
[39] The standard MG 15 machine guns were retained. These features were present in the next variant the Z-3.
The Z-3 formed part of the bomber versions of the Z series, it was,
however, also used as a reconnaissance aircraft by the staff flight of
the particular unit. The engines and the general equipment were
identical to the Z-2 standard; however two cameras — the Rb 50/30 and Rb
20/30 - were incorporated into the crew entry hatch. A handheld camera
was issued to the crew to validate the success during bombing missions.
Autopilot equipment was added later. The Z-2 and Z-3 were identical
visually, and could only be distinguished from each other by the altered
crew hatch on the Z-3. Owing to spacing problems because of the added
camera equipment, the ammunition supply was reduced from 44 to 42
magazines.
[40]
The power plant of the Z-3 was upgraded to the Bramo 323P-2. The Bramo
P-2 remained the engine of all the remaining Z series variants.
[3]
The Z-4 was designed as trainer. Although nearly identical to the Z-2
and Z-3, it featured several equipment changes optimised for blind
flying training. The four-seat aircraft had a single control column with
dual steering, which was achieved by a jib protruding to the right.
Rudder pedals were in front of both seats. The defensive armament and
bomb racks were reduced, or in most cases omitted to reduce weight.
[40]
The Z-5 was similar to the Z-3 with a weight of 19,000 lb (8,600 kg). Designed as an anti-shipping aircraft, the
Z-5, was fitted with flotation cells in the fuselage and engine nacelles in case it was forced down on water.
[13][41]
Usually the flotation devices took the form of inflatable bags stored
in the rear of the engine nacelles and in bulges on either side of the
nose, just behind the front glazing.
[42]
Later variants of the Z model were developed. The Z-6 was to be a
reconnaissance aircraft, although it was only built as a prototype.
During the war only a few were converted from existing combat variants.
The type was selected for weather check flights. It was identical to the
Z-1/Z-2 variants, but offensive armament was omitted and extra fuel
cells fitted. This increased the fuel load to 2,890 l (578 Imperial
Gallons). As flights required higher altitude, the oxygen supply was
increased from 20 to 24 bottles. For long-range flights over water, the
larger dinghy of the Z-5 with its updated emergency escape equipment was
mandatory during operations.
[40]
The Z-6s were also used for night fighter operations. Some of the few
converted Z-6s had the Ju 88C-6 nose installed and were equipped with
machine guns and cannons. The nose proved to be unsatisfactory, and it
was redesigned. In the tip of the new nose was an infrared spotlight which was soon made redundant after the introduction of Lichtenstein radar which was fitted to some of the Z-6.
[42]
Do 17 Z-2s over France, summer 1940
[43]
The Z-8
Geier was not produced. It was intended as a ground
attack aircraft and reached the first planning phase but was given up
due to lack of performance and protective armour allocation against
anti-aircraft artillery. An increase in armour would have meant a
decrease in speed which would have exposed the aircraft further to enemy
fire.
[44]
The Z-9, which was fitted with special bomb release equipment, and
delayed release gear for low-level attack missions. Its purpose was to
suppress enemy air defences. Therefore it was designed to fly over
anti-aircraft positions and drop Butterfly Bombs, an early form of cluster bomb munitions. This could only be done with air superiority,
as the Z-9 was unarmoured. The airframe and equipment was identical to
the Z-1/Z-2 version. Only the bomb bay was altered to accommodate 16
bomb-dispenser systems. The maximum weight of the Z-9 was 7,800 kg
(17,200 lb). The design did not reach serial production.
[44]
After bomber production ended in 1940, the Z model was modified with a "solid" nose from the Ju 88C, fitted with one 20 mm MG FF cannon and three 7.92 mm (.312 in) MG 17 machine guns, to be used as night fighters. Three prototypes were converted from existing Z-series airframes to the
Do 17 Z-7 Kauz I ("screech-owl")
configuration. The standard Z-7 was fitted with Bramo 323P-1 radial
engines and had a crew of three airmen. In comparison to the standard
bomber version, the fuel load arrangement was altered by subdividing
into cells. Two cells were in the wings, with a capacity of 770 litres
(154 imperial gallons) each. A third cell was placed in the bomb bay
within the main fuselage, having a capacity of 895 litres (179 imperial
gallons). The oxygen supply for the three man crew was reduced to nine
bottles, as intercepts at high altitudes were not anticipated. Add-on
armour in the form of heavy steel plates was bolted to the nose bulkhead
to protect the crew against frontal fire. Originally, it was planned to
completely armour the crew compartment. This idea, was given up again
as the increased weight would have reduced flight performance of an
already slow aircraft. The ammunition loads for the three 7.92 mm MG 17
amounted to 3,000 rounds and 400 rounds of ammunition for the 20 mm MG
151 cannon (although some Do 17Z bombers carried a single 20 mm for
ground attack missions).
[40][45]
Later, the design was further modified to the
Do 17 Z-10 Kauz II, the solid nose now containing an infra-red searchlight for the
Spanner Anlage infrared detection system.
[46]
The infrared lamp in the nose was used to illuminate the target while
the display unit in the windshield made the reflection visible to the
target.
[47] The Z-10 was armed with four 7.92 mm (.312 in) MG 17 machine guns grouped above the IR light and two 20 mm MG FF in the lower nose.
[46] The crew could reload the 20 mm cannons' drum magazines internally. The Z-10 contained an IR searchlight (
Spanner-Anlage) for the Spanner infrared detection system.
[48][49] A single
Kauz II was equipped with and tested the Lichtenstein radar.
[38]
Only 10 of these Kauz II designs were converted from existing Z-series airframes. The
Spanner
system proved to be essentially useless and many Z-10 were left without
any detection system. At least one Z-10, coded CD+PV, was used as a
flying test bed to help developing the early low-UHF band B/C version of the Lichtenstein radar system in late 1941–1942.
[Notes 3]
When the Z-10 was stripped of all non-night fighter equipment, it had a
maximum weight of 7,300 kg (16,100 lb). Armament fit was similar to
that of the Z-7, with an added MG 17 and an additional 1,000 rounds of
ammunition in the nose section. Defensive gun positions included the B
and C stand, each equipped with a single MG 15.
[44]
Do 215
Main article: Dornier Do 215
The
Do 215 was developed as an export version of the Do 17Z series, and was used as a bomber, reconnaissance and night fighter aircraft.
Production
German
The Do 17Z was the most produced variant of the Do 17 series
Official figures state 2,139 Do 17s were built on German assembly lines. At the Dornier factory at Oberpfaffenhofen,
328 Do 17Es were built along with a further 77 Do 17Fs and 200 Do 17M
variants. Do 17Z production figures for Oberpfaffenhofen stand at 420.
At Friedrichshafen,
84 Do 17Ks were built, some of which were sold to the Yugoslav Royal
Air Force. Do 17P production was spread out over different factory
lines. At Siebel/Halle, eight were built. At the Henschel factory at Berlin-Schönefeld 73 were constructed. At the HFB plant in Hamburg
149 were built. Henschel also produced some 320 Do 17Zs, HFB
contributed to construction of 74 at its Hamburg plant, and another 73
were built at Siebel. Some 105 examples of the Dornier Do 215B was later built at Oberpfaffenhofen.
[3]
By 19 September 1938, the Luftwaffe had received 579 Dornier Do 17s. These were mostly Do 17E, F, M and P variants.
[50]
During 1939–1940, some 475 Dornier Do 17Z bombers, 16 reconnaissance
aircraft and nine night fighters were built. Another 100 Dornier Do
215s, an updated variant of the Do 17, were built during this period
also.
[51]
Yugoslav
Other governments were interested in the Do 17. In June 1936, the Yugoslav
government ordered 36 Do 17E variants from Germany. The negotiations
for a licence were completed on 27 June 1938 for 36 Do 17Ka's at the
cost of 1,829,825
Reichsmark
(RM). On 18 March 1938, Yugoslavia ordered 16 complete Do 17 Ka-2's and
Ka-3's at a cost of 3,316,788 RM. They received the last on 21 April
1939. The machines were from 72-96% complete.
[52]
The Dorniers were devoid of German equipment, including engines. The
Yugoslavs found a French manufacturer to supply the powerplants instead.
Gnome et Rhône was the supplier chosen, and the Gnome-Rhône Mistral Major
engine was to be used in the Dornier. The French had inflated the
performance data of the engine, claiming it to have 649 kW (870 hp) and a
speed of 420 km/h (261 mph) at 3,850 m (12,320 ft). The constant-speed propellers were also poor, and delivered late. This led to trials with Piaggio Aero and Ratier propellers.
[53]
Only one of the Do 17s delivered was fitted out complete with German
equipment. The rest of the Dorniers were equipped with Belgian FN 7.9 mm
(.31 in) machine guns, Czech camera equipment and eventually Telefunken radio sets.
[25] Altogether, 70 Do 17s were produced by Yugoslav factories.
Operators and operational history
Main article: Operational history of the Dornier Do 17
The rudder of a Dornier Do 17 shot down on 28 August 1940. The hole at the top is a 0.303 in (7.7 mm) bullet hole.
- Bulgaria
- The Bulgarian Air Force
received 11 Do 17 Ms and Ps in 1940 and at least 11 ex-Yugoslav
aircraft in 1941. Six more Do 17 Ms were delivered in 1943. They
remained in service until at least 1945.[54]
- Independent State of Croatia
- The Air Force of the Independent State of Croatia (Zrakoplovstvo Nezavisne Države Hrvatske) received at least 21 Do 17Zs (the last 12 in 1945), 11 ex-Yugoslav Do 17Ka's in 1942 and 30 Do 17Es in 1943.[55]
- Finland
- Finnish Air Force
- 46 Squadron received 15 aircraft in January 1942:[56][57]
- Germany
- Hungary
- Royal Hungarian Air Force received one ex-Yugoslavian Do 17Ka-3.[58]
- Italy
- Regia Aeronautica operated at least one ex-Yugoslavian Do 17Ka-3 under 1° Centro Sperimentale in Guidonia, where it was tested until September 1943.[59]
- Romania
- Royal Romanian Air Force received 10 worn Do 17Ms in November 1942.[60]
- Spanish Republic
- Spanish Republican Air Force received ex-Legion Condor Do 17E, F, and Ps and 13 remained in service after the end of the Spanish Civil War.[61][62]
- Switzerland
- Swiss Air Force operated a single Do 17Z-2, interned after landing at Basel Airport in April 1940.[63]
- Kingdom of Yugoslavia
- United Kingdom
- Royal Air Force pressed into service[64][65] two Yugoslav-built Do 17Ks which escaped Yugoslavia carrying King Peter and gold.[66] The aircraft were given the serials AX706 and AX707. Both aircraft were destroyed in an air attack on Ismaïlia airfield on 27 August 1941.[67]
- United States
- United States Army Air Forces operated at least one Do 17E-1, WkNr 2095. Renamed Axis Sally, it was taken to the United States after the war and tested.[68][69]
Survivors
Until 2007 none of the Dornier twin-engined bomber variants were
thought to have survived intact, but various large relics of the Do 17
and Do 215 are held by public museums and private collectors.
[70][Notes 4] In September 2007 a Do 215 B-5 (variant of Do 17Z) was found largely intact in the shallow waters off Waddenzee in the Netherlands.
[71]
Dornier Do 17Z Werknummer 1160
The fuselage of
1160 undergoing conservation in a hydration tunnel at the RAF Museum Cosford, July 2013. The fuselage is upside down and the cockpit area is nearest the camera
On 3 September 2010, the RAF Museum
announced that a Do 17 had been discovered in 50 ft (15 m) of water off
the coast of England. The aircraft had been discovered in September
2008 on the Goodwin Sands, a large sandbank 6 kilometres (3.7 mi) off the coast of Kent, but the discovery was kept a closely guarded secret. The Dornier Do 17Z-2,
Werknummer 1160, built under license by Henschel
[72] with the full
Geschwaderkennung (combat wing aircraft ID code) of 5K+AR, was operated by 7
Staffel, III
Gruppe,
Kampfgeschwader 3 (KG 3).
The port engine nacelle of
1160 while it was in wash tent; the tyres are still pressurised (July 2013)
On 26 August 1940,
5K+AR was taking part in a raid by KG 2 and KG 3, targeting the RAF stations RAF Debden and RAF Hornchurch.
While flying over clouds, the aircraft became separated from the bomber
formation and lost its bearings; it was then attacked by Boulton Paul Defiant fighters of No. 264 Squadron RAF. One of the Dornier's engines was disabled and the other damaged, so the wounded pilot,
Feldwebel
(Flight Sergeant) Willi Effmert, elected to make a crash landing on the
Goodwin Sands. He and another crew member survived and were taken
prisoner. The other two crew were killed; one is buried at Cannock Chase German war cemetery
and the other in the Netherlands. The identity of the Defiant that shot
down the Dornier is not certain – it may have been one of three 264
Squadron aircraft that was shot down soon after in a battle with Bf 109E fighter escorts of the German fighter wing JG 3
[73][74] or it may have been a Defiant crewed by Fred Dash and Desmond Hughes, who downed two Do 17s on that day in that area.
[75]
The wing section seen port side removed from tent for manual work; It was pulled out in September 2014.
This aircraft is one of at least fourteen Dorniers that are known to have crashed in the area,
[76] and crew from another Do17, call sign U5+DM, designating it as being from the 4.
Staffel/KG 2, are buried in the local Hamilton Road Cemetery, Deal as well as at Cannock Chase.
In June 2010 diving operations were carried out and the survey report
indicated that the aircraft was largely complete, although
5K+AR lay inverted on the seabed, indicating that it ground-looped on landing.
[77]
The port rudder, starboard stabiliser, forward nose glazing,
undercarriage doors and engine cowling were missing, but the discovery
of a small debris field associated with the wreck indicates that some or
all of those parts may still be present at the site.
[77] Some items, including two of the Dornier's six MG 15 machine guns, are missing and are believed to have been stolen by unauthorized divers sometime after the aircraft's discovery.
[78]
After completing fund-raising and devising a plan for recovery and conservation, the Royal Air Force Museum announced that the wreck would be recovered in May 2013.
[79] The recovery was originally planned to take around four weeks, using a specially-constructed lifting frame to raise
5K+AR
from the sea, but this approach was altered as costs escalated with
delays due to bad weather. The aircraft was eventually raised on 10 June
2013.
[80]
It was then taken to the Michael Beetham Restoration Centre at the Royal Air Force Museum's Cosford site, where metallurgists from Imperial College London have a significant role in the post-recovery conservation of the aircraft.
[81] Current plans are to use Citric acid to remove encrustation and chloride compounds from the aluminium airframe.
[82]
Dornier Do 17M-1 (Hansakollen, Norway)
On 2 July 1942, a Dornier Do 17M-1 crashed in Hansakollen in Maridalen, outside of Oslo, Norway.
[83]
The Do 17 was heading to the airport at Gardermoen, but crashed into a
mountainside. All three German aviators on board were killed. They are
buried at the German war cemetery at Alfaset.The wreck is well preserved
and remains clearly visible, over 70 years after the accident.
Specifications (Do 17 Z-2)
Data from Aircraft of the Third Reich,[84] Fighters and Bombers of World War II[85] and Do 17 Z-2 Baubeschreibung, April 1938
General characteristics
- Crew: 4
- Length: 15.8 m (51 ft 10 in)
- Wingspan: 18 m (59 ft 1 in)
- Height: 4.56 m (15 ft 0 in)
- Empty weight: 5,210 kg (11,486 lb)
- Empty equipped: 5,888 kg (12,981 lb) to 5,963 kg (13,146 lb)
- Max takeoff weight: 8,837 kg (19,482 lb)
- Fuel capacity: standard fuel 1,540 l (339 imp gal), with aux tank in forward bomb bay 2,435 l (536 imp gal)
- Powerplant: 2 × Bramo 323P 9-cyl. air-cooled radial piston engines with 1,000 PS (986 hp, 736 kW) for take-off
- Propellers: 3-bladed variable-pitch propellers
Performance
- Maximum speed: 350 km/h (217 mph; 189 kn) at 8,040 kg (17,725 lb) at sea level
-
-
-
-
-
- 410 km/h (255 mph) at 8,040 kg (17,725 lb) at 5,000 m (16,404 ft)
- Cruising speed: 300 km/h (186 mph; 162 kn) at 8,837 kg (19,482 lb) at 4,000 m (13,123 ft)
- Combat range: 660 km (410 mi; 356 nmi) with 1,540 l (339 imp gal) fuel and 1,000 kg (2,205 lb) of bombs
-
-
-
-
-
- 1,010 km (628 mi) with 2,435 l (536 imp gal) fuel and 500 kg (1,102 lb) of bombs
- Service ceiling: 8,200 m (26,903 ft)
- Wing loading: 156 kg/m2 (32 lb/sq ft)
- Power/mass: 0.170 kW/kg (0.11 hp/lb)
Armament
- Guns: 6 × 7.92 mm (0.312 in) MG 15 machine guns in front, rear upper, rear lower and cockpit side positions
- Bombs: 1,000 kg (2,205 lb) of bombs carried internally, either 20 x 50 kg (110 lb) bombs or 4 x 250 kg (551 lb) bombs
See also
- Related development
- Dornier Do 215
- Dornier Do 217
- Dornier Do 317
- Aircraft of comparable role, configuration and era
- Bloch MB.170
- Bristol Blenheim
- Tupolev SB
- Related lists
- List of aircraft of World War II
- List of bomber aircraft
- List of military aircraft of Germany