Editing Heinkel He 100 (section)

== Projekt 1076 (further development) ==
In late 1944, the RLM went to manufacturers for a new high-altitude fighter with excellent performance; the [[Focke-Wulf Ta 152|Ta 152H]] (an inline engined version of the [[Focke-Wulf Fw 190]]) was in limited production but Heinkel was contracted to design an aircraft and Siegfried Günter was placed in charge of the new ''Projekt 1076''. The new design was similar to the He 100 but many detail changes resulted in an aircraft that looked all new. It sported a new and longer wing for high-altitude work, which lost the inverted gull wing bend and was [[Swept wing|swept]] forward slightly at 8°. Flaps or ailerons spanned the entire [[trailing edge]] of the wing giving it a rather modern appearance. The cockpit was [[Cabin pressurization|pressurized]] for high-altitude flying and covered with a small [[bubble canopy]] that was hinged to the side instead of sliding to the rear. Other changes that seem odd in retrospect is that the gear now retracted outward like the original Bf 109 and the surface cooling system was re-introduced. Planned armament was one {{convert|30|mm|in|abbr=on}} [[MK 103 cannon]] firing through the propeller hub and two wing mounted 30mm [[MK 108 cannon]]s.

Three engine types were planned, the DB 603M with {{convert|1361|kW|abbr=on}}, the DB 603N with {{convert|2051|kW|abbr=on}} or the [[Junkers Jumo 213|Jumo 213E]], designed from the start to have the same fluid service locations as the DB 603, with {{convert|1287|kW|abbr=on}}. The 603M and 213E both supplied {{convert|1545|kW|abbr=on}} using [[MW-50]] water injection. Performance with the 603N was projected to be {{convert|880|km/h|abbr=on}}, in the same class as the [[Messerschmitt Me 262]] pioneering [[jet fighter]] then entering service testing, which would have stood as a record for many years, even against specialist racing machines. Performance would still be excellent even with the far more likely {{convert|1500|kW|abbr=on}}-output and above class aviation piston engines, which eventually proved to be [[Luftwaffe#Engine development|a severe technological barrier]] for the German aero-engine industry during the war years. The 603M was projected to give it the high speed of {{convert|855|km/h|abbr=on}}.

These figures are somewhat suspect and are likely to be optimistic guesses that could not have been realised, something Heinkel was famous for. Propellers lose efficiency as they approach the speed of sound and eventually they no longer provide an increase in thrust for an increase in engine power. The only remaining gain of thrust would come from the piston engine exhausts. The advanced contra-rotating ''Vereinigte Deutsche Metallwerke'' (VDM)-origin propeller design is unlikely to have been able to counteract this problem. The design apparently received low priority and it was not complete by the end of the war. Siegfried Günter later provided detailed drawings and plans for the Americans in mid-1945.