Prior to the Second World War, high altitude fighter development was a largely secondary issue for most air forces. The premier fighters of the battle of Britain, the Spitfire Mk I and the Bf 109E, both exemplified this, but in the months to come, higher flying reconnaissance aircraft and bombers needed high altitude interceptors to deal with them. In this role, the Luftwaffe would employ the Messerschmitt Bf 109E7Z, which was similar to earlier variants, but used a nitrous boost system which delivered oxygen to the engine once the aircraft rose beyond the altitude its supercharger could maintain combat power. This closely guarded system, known as GM1, or Goering Mixture 1, would prove effective, and became an essential piece of equipment for Germany’s high altitude fighter and reconnaissance programs for much of the war. This would evolve into a series of planes based on the Gustav series and meant for highaltitude work.

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Sources:
Primary:
Bf 109G2 Flugzeug Handbuch (Stand Juni 1942).Der Reichsminister der Luftfahrt und Oberbefehlshaber der Luftwaffe, Berlin. November 1942.
Bf 109G4 Flugzeug Handbuch (Stand August 1943). Der Reichsminister der Luftfahrt und Oberbefehlshaber der Luftwaffe, Berlin. September 1943.
Bf 109G2 Flugzeug Handbuch (Stand August 1943). Der Reichsminister der Luftfahrt und Oberbefehlshaber der Luftwaffe, Berlin. October 1943.
Flugzeug Flugleistungen Me 109GBaureihen. Messerschmitt AG Augsburg. August 1943.
DaimlerBenz DB 605 Inverted V12 Engine. National Air and Space Museum Collection. Inventory number: A19670086000.
Flugzeugmuster Bf 109 G1 mit Motor DB 605A. Rechlin E`Stelle Erprobungsnummer 1586. 1943.
Memorandum Report on P47D10 Airplane, AAF No. 4375035. Army Air Forces Material Command. Wright Field Dayton, Ohio. 11, October 1943.
The performance of Spitfire IX aircraft fitted with high and low altitude versions of the intercooled Merlin engine. Aircraft and Armament Experimental Establishment Boscombe Down. 4 March 1943
Leistungszusammenstellung Me 109G. Messerschmitt AG. Augsburg. 1 January, 1944.
Leistungen Me 109G mit DB 605 AS. Messerschmitt AG. Augsburg. 22, January 1944.
Leistungsmessung Me 109 G mit GM 1 – Zusatzeinspritzung. Messerschmitt AG. Augsburg. 21, September 1943.
Me 109 G1. Ausführung. Messerschmitt AG. Augsburg. 21 May, 1942.
Speed vs Altitude P51B15 4324777. Flight Test Engineering Branch Memo Report No. Eng471749A. 20 May 1944.
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Secondary:
Douglas, Calum E. Secret Horsepower Race: Second World War Fighter Aircraft Engine Development on the Western Front. TEMPEST, 2020.
THE EFFECTS OF POOR QUALITY ASSURANCE DURING GERMAN AVIATION MANUFACTURING ON THE LUFTWAFFE DURING WORLD WAR II. MICHAEL J. GALLANT, MAJOR, UNITED STATES MARINE CORPS
B.A Florida State University, Tallahassee, Florida, 2006.
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Prien J. & Rodeike P. Messerschmitt Bf 109 F,G, &K Series An Illustrated Study. Schiffer Publishing Ltd. 1997.
Mosquito Fates, based on AirBritain files. Donated files, Mossie.org.

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Article by: Henri H.
Script by: Henri H.
Narrated by Aurum
Edited by Thundershark
Sound edited by Aurum