High Altitude Interceptor The U7 was developed as per a requirement of the RLM ("Reichsluftfahrtministerium" = air defense ministry). The Luftwaffe feared the appearance of high altitude bombers (B-29, B-17 flying at high altitude, reconnaissance Mosquito's) and asked for an aircraft capable of attacking above 8000 meters. By Groundcrew Design Group. Requires "gc110_01.zip"