There is an actual airplane (multi engine) that uses these: https://pilotweb.aero/aircraft/flight-test-colomban-jet-cri-cri-6303028/ https://pilotweb.aero/airc

There is an actual airplane (multi engine) that uses these: https://pilotweb.aero/aircraft/flight-test-colomban-jet-cri-cri-6303028/ https://pilotweb.aero/aircraft/flight-test-colomban-jet-cri-...