John Thorp had designed the Lockheed Model 33 Little Dipper also known as the Air Trooper in 1944. Only one example was built and flown before the program was cancelled.
After WWII, Thorp designed the Thorp T-211 Sky Skooter and allowed his employee George Robertson to manufacture extra parts and convert a T-211 back into a single seat aircraft to replicate the original Lockheed Air Trooper.
Replica:
Robertson Sky Skeeter
All Aero 