Ok,
I have a Goldberg Cub with an O.S. 91 and I think it is the perfect
airplane engine combination.

Is it too much engine, yes, so what, it' a blast.
No where near scale, but FUN !!!!!!!
It's got a throttle, just put it where you want it.

I would definately clip the wing though, it's nowhere near the same plane with a long wing, and as mentioned earlier, it
floats like crazy even with the short wing, the long wing is way
worse.

I built this airplane as an alternative to some fast planes I was
flying at the time. I wanted something for low and slow type stuff
and also wanted to try me first 4-stroke.
All I can say is that twelve years later it is still the best airplane
I've ever had in my collection. She cuts up nicely for a cub, but
with lower throttle settings, she still flys like a cub is supposed to.
Airplane has so much time on it I've replaced every hinge on it at least twice, just plain wearing them out. She's looking kinda old now, everthing on her is loose and worn, but I'm still working her as hard today as the day I first flew her, ok I lied, actually I'm working her harder.
Thought I would only fly this plane on occasion, but it fooled me
It goes with me everytime I fly.
I've got to get another one as a backup, because as bad as I hate to admit it, this ones days are probably numbered.

Did you get the point, that I like my Cub ?
sorry I rambled......

James