Alcor Duo 6
http://mysteriousbill.weebly.com/alcour-duo.html
American Gyro Crusader
http://mysteriousbill.weebly.com/american-gyro.html
Arup Flying Wing
http://mysteriousbill.weebly.com/arup.html
Auto Giro
http://mysteriousbill.weebly.com/auto-giro.html
Abrams
http://mysteriousbill.weebly.com/abrams.html
I recommend the following two sites for more info on American planes of all eras.
http://www.aviastar.org/air/usa/index.php
http://www.aerofiles.com/aircraft.html