The Messerschmitt Me 509 was an all-metal fighter project, underway in Germany during World War II.

It was based on the Me 309 but with the engine located behind a pressurized cockpit, much in a similar manner to the US Bell P-39 Airacobra.

The tricycle landing gear from the Me 309 was retained, which worked better on the 509, due to the lower weight on the nosewheel - the Me 309's nosegear had collapsed during trials.

The project was cancelled along with the Me 309,[1] but the Japanese made a similar aircraft, the Yokosuka R2Y Keiun, which suffered from engine overheating.

Related development Aircraft of comparable role, configuration, and era