In my younger days, I actually built the Goldberg Jr. Skylark and flew it for a summer on single Ace Pulse proportional and TWIN Pee Wee .020's It was a gas! When one motor quit, you could JUST keep it straight with the rudder hard over. Usually the second one quit within 30 sec of the first, so it was workable.

Years later, I converted it to 2 channel EK, but the thrill of flying a single channel twin was gone...