x-plane

What lessons have been learned from failed prototypes? I am thinking in terms of how the AMES AD-1 revealed problems with roll/yaw coupling at steeper angles of wing sweep.

I was dumbstruck to notice on Amazon a forthcoming book in Osprey Publishing's X-Planes series about the McDonnell XP-67 experimental bomber-destroyer, so I'm thinking the following potential books should be published in the X-Planes series by Osprey Publishing: America's Tilt-Duct X-Planes...