The basic single-seat unpowered glider.
• Fi 103R-II - Experimental Glider
Had a second cockpit fitted where the warhead would normally be. Unpowered glider
• Fi 103R-III - Twin-seat Pulse-Jet Flying Bomb
A two seater, powered with a pulsejet.
• Fi 103R-IV - Pulse-Jet Flying Bomb
The standard powered operational model. By October 1944 about 175 R-IVs were ready for action.
• Fi 103R-V - Twin-seat Pulse-Jet Trainer
Powered trainer for the He.162 (shorter nose)
• Fi 104 - Space Rocket Fighter Project (1944)
The Fieseler Fi-104 has been noted as a space fighter, developed from the knowledge gained with the Fi 103. They knew that Germany needed a space fighter if it was to be able to defend its holdings in orbit, and they also knew that it was going to take time to come up with something properly built. General consensus that this was probably work of fiction. See also http://www.secretprojects.co.uk/forum/index.php/topic,17115.msg218323.html#msg218323
• Fi 256 - Reconnaissance Aircraft (1943)
A five seat civil version of the Fi 156 design; two were built by Morane-Saulnier.