Designed as a VTOL aircraft in 1944 by Germany, the Triebflugel never developed beyond models. This is not a 100% replica, however it does function as the original design intended without modded parts (though it is very difficult to control).
Not exactly a usable flying craft, more of a demonstration. If anyone wants to try making to flyable then feel free (just give credit and such).
How to 'Fly':
Decouple the rotor (just hit stage)
Switch to the rotor, activate the engines and turn on 100% throttle (you'll need it all)
Switch back into the cockpit and hold on as long as you can without exploding.