Anybody remember the Ringmaster that was built to show off the ultra light/small Orbit radio in 1969? This was the first radio with servos that weighed 1 1/4 oz, the PS-4. They reduced the chord of the wing in the conversion and left the rest of the design stock.

I took a CL combat job called the Guillotine and converted it to RC in 1973, with a .19 engine and two channels (elevator and aileron) that flew quite well.