I consider myself to know a lot about a lot of different types of WWII aircraft but on occasion I find myself seeing a picture of something and having no idea what it is.
Tonight I found myself having one such occasion when someone sent me this picture...
Never seen these before...
So I eventually found out what they are:
http://en.wikipedia.org/wiki/Ryan_FR_Fireball
Mixed jet and propeller aircraft with 66 made and one squadron operational before the end of WWII but with no combat record. Fascinating!