Heinkel He 280

Infobox Aircraft
name = He 280



type = Fighter
manufacturer = Heinkel
caption = Heinkel He-280 V2.
Note missing engine nacelle, removed due to a fuel leak.
designer = Robert Lusser
first flight =22 September, 1940
introduced =
retired =
status = Cancelled
primary user =
more users =
produced = 1940-1943
number built = 9
unit cost =
variants with their own articles = The Heinkel He 280 was the first turbojet-powered fighter aircraft in the world. It was inspired by Ernst Heinkel's emphasis on research into high-speed flight and built on the company's experience with the He 178 jet prototype. A combination of technical and political factors led to it being passed over in favor of the Messerschmitt Me 262.fact|date=September 2007 Only nine were built and none reached operational status.fact|date=September 2007

Development

The Heinkel company began the He 280 project on its own initiative after the He 178 had been met with indifference from the "Reichsluftfahrtministerium" ("RLM") (Ger. "Reich Aviation Ministry"). The head designer was Robert Lusser, who began the project under the designation He 180 in late 1939. It had a typical Heinkel fighter fuselage, elliptically-shaped wings and a dihedral tailplane with twin fins and rudders. The landing gear was of the retractable tricycle type with very little ground clearance."Janes Fighting Aircraft of World War II" (Random House Group Ltd. 20 Vauxhall Bridge Road, London SW1V 2SA, 1989, ISBN 1-851-70493-0), 318 pp.] Internally, the He 280 was equipped with a compressed-air powered ejector seat, the first aircraft to carry one. It was also planned to pressurize the cockpit.fact|date=September 2007

The first prototype was completed in the summer of 1940, but the Heinkel HeS 8 intended to power it was running into difficulties. On September 22 1940, while work on the engine continued, the first prototype started glide tests with ballast hung in place of its engines."Janes Fighting Aircraft of World War II" (Random House Group Ltd. 20 Vauxhall Bridge Road, London SW1V 2SA, 1989, ISBN 1-851-70493-0), 318 pp.] It would be another six months before Fritz Schäfer would take the second prototype into the air under its own power, on March 30 1941. The type was then demonstrated to Ernst Udet, head of the RLM's development wing, on April 5, but like its predecessor, it apparently failed to make an impression.fact|date=September 2007

Had Udet approved development Heinkel would have received the extra funding which they needed. This might have led to a rectification of the problems they were having with the jet engines. This was the case across all jet engine development in Germany; government funding was lacking at the critical stage, that of initial development. The entire jet program was under-funded, with the effect that unreliable engines were commonplace.fact|date=September 2007

A contest flight in 1941 comparing an He280 with a FW190 had the He280 completing four laps of an oval course before the FW190 could complete three. Ernst Heinkel designed a smaller jet fighter airframe for the He280 that was well-matched to the lower thrust jet engines available in 1941. The maximum weight of the He280 was 9,470 lbs compared to 15,720 lbs for the Me262 (which did not get an adequate thrust engine until late 1944). The He280 could have gone into production by late 1941 and maintained the air superiority, which the FW190 had established and filled the gap between the FW190 and Me262. Initial problems with the HeS 8 engine would have likely been ironed out as production of the fighter began.

Some of the resistance to the He280 would make little sense today. The tricycle landing gear was considered too frail for grass or dirt airfields which were common at the time especially in Russia and North Africa. The Me262 was originally designed as a tail-dragger, but this configuration makes it difficult for a jet to become airborne. Test pilots had to tap on the brakes to get the Me262 tail off the ground while trying to take off. The Me262 was redesigned with tricycle landing gear.

One benefit of the He280 which impressed the political leadership was the fact that the jet engines could burn kerosene, which requires much less expense and refining than the high octane fuel used by piston-engined aircraft. The He280 might have been more easily "sold" if Heinkel stressed the possibility of using it as an attack aircraft for anti-shipping. While the R4M rockets were not available until 1944, the Germans did develop the Nebelwerfer in 1941, which was a recoilless 150mm artillery piece. These tubes could have been mounted underneath the wings of a jet. German pilots complained that bombs dropped by the Me262 had little chance of hitting their targets. A forward-firing recoilless weapon would have been much more effective.

Had the German government given support to production, the He-280s could conceivably have gone into production earlier in the war and reached the "Luftwaffe" earlier than was ultimately the case with the Me 262. But it was not to be, as Udet, on that April day in 1941, could not see a need for a plane without propellers, no matter what its future might be.fact|date=September 2007

Over the next year, progress was slow due to the ongoing engine problems. A second engine design, the Heinkel HeS 30 was also undergoing development, both as an interesting engine in its own right, as well as a potential replacement for the HeS 8. In the meantime, alternative powerplants were considered, including the Argus As 014 pulsejet that famously powered the V-1 flying bomb.fact|date=September 2007

By the end of 1943, however, the third prototype was fitted with refined versions of the HeS 8 engine and was ready for its next demonstration. On December 22, a mock dogfight was staged for RLM officials in which the He 280 was matched against a Focke-Wulf Fw 190. Here the jet demonstrated its vastly superior speed.fact|date=September 2007 Finally, at this point the RLM became interested and placed an order for twenty pre-production test aircraft, to be followed by 300 production machines.

Engine problems continued to plague the project. In 1942 the RLM had ordered Heinkel to abandon the HeS 8 and HeS 30 to focus all development on a follow-on engine, the Heinkel HeS 011, a much more advanced (and therefore problematic) design.fact|date=September 2007 Meanwhile, the first He 280 prototype had been re-equipped with the Argus pulsejets and was towed aloft to test them. Bad weather caused the aircraft to ice up, however, and before the jets could be tested, pilot Helmut Schenk became the first person to put an ejector seat to use. The seat worked perfectly, but the aircraft was lost, and never found.

With the HeS 011 not expected for some time, Heinkel was forced to accept that it would have to use a competitor's engines, and selected the BMW 003. Unfortunately, this engine was also experiencing problems and delays, and in the meantime, the second He 280 prototype was re-engined with Junkers Jumo 004s while the next three airframes were earmarked for the BMW motor (which, in the end, would never be ready before the end of the He 280 project). The Jumo engines were much larger and heavier than the HeS 8 that the plane had been designed for, and while it flew well enough (for the first time on March 16 1943), it was immediately obvious that this engine would be unsuitable in the long term.fact|date=September 2007 The aircraft was slower and generally less efficient than the Me 262."Janes Fighting Aircraft of World War II" (Random House Group Ltd. 20 Vauxhall Bridge Road, London SW1V 2SA, 1989, ISBN 1-851-70493-0), 318 pp.]

Less than two weeks later, on March 27, Erhard Milch cancelled the project. The Jumo 004 powered Me 262 appeared to have most of the qualities of the He 280, but was better matched to its engine. Heinkel was ordered to abandon the He 280 and focus attention on bomber development & construction, something he remained bitter about until his death.fact|date=September 2007

pecifications (He 280 V3)

aircraft specifications
plane or copter?=plane
jet or prop?=jet
ref=
crew=one, pilot
capacity=
payload main=
payload alt=
length main= 10.40 m
length alt= 34 ft 1 in
span main= 12.20 m
span alt= 40 ft
height main= 3.06 m
height alt= 10 ft
area main= 21.5 m²
area alt= 233 ft²
airfoil=
empty weight main= 3,215 kg
empty weight alt= 7,073 lb
loaded weight main= 4,280 kg
loaded weight alt= 9,416 lb
useful load main=
useful load alt=
max takeoff weight main= 4,300 kg
max takeoff weight alt= 9,470 lb
more general=
engine (jet)= Heinkel HeS.8
type of jet= turbojet
number of jets=2
thrust main= 5.9 kN
thrust alt= 1,320 lbf
thrust original=
afterburning thrust main=
afterburning thrust alt=
max speed main= 820 km/h
max speed alt= 512 mph
cruise speed main=
cruise speed alt=
stall speed main=
stall speed alt=
never exceed speed main=
never exceed speed alt=
range main= 370 km
range alt= 230 miles
ceiling main= 10,000 m
ceiling alt= 32,000 ft
climb rate main= 1,145 m/min
climb rate alt= 3,756 ft/min
loading main=
loading alt=
thrust/weight=
power/mass main=
power/mass alt=
more performance=
armament=
* 3 x 20 mm MG 151/20 cannon
avionics=

ee also

aircontent
related=

similar aircraft=

sequence=

lists=
*List of military aircraft of Germany -
*List of World War II jet aircraft

see also=

References