le proto
https://theaviationist.com/2017/08/30/here-are-the-first-images-of-the-first-bell-v-280-valor-next-generation-tilt-rotor-aircraft-prototype/
https://theaviationist.com/2017/08/30/here-are-the-first-images-of-the-first-bell-v-280-valor-next-generation-tilt-rotor-aircraft-prototype/