Hi again,
OK, now I recall, to some degree.
The Whopper seems to be controlled by aileron, elevator (by the same servo swash plate and control surface), rudder (control surface) and throttle.
Since there was a flybar on it, and since it has a swash plate (compared to the Kwirl), I guess I'd set it up as a helicopter, but mix in a tail elevator servo together with the swash plate elevator function.
It will require some fine tuning, I guess, since we can only derive so much from the drawings / mechanical parts, as to how much mixing there was between the elevator control surface and the elevator swash plate.
Nice thing to try, outcome open
Cheers
Eddi
Born to fly ...
forced to work.