I have a GP U-can-do .46. Great Planes does not recommend putting anything bigger than a .72 four-stroke on it. When I bought mine, there was a tech notice that said not to fly the U-Can-Do at over (something like half-throttle) up at more than a 10 degree angle if you have more than a .72. They claimed that the tail would ALSO break. Well......I have a .91 4-stroke in mine, and 200 flights later, it's stil in one piece, and I always fly full-throttle straight up. I added "fly wires" between my horizontal stab and the fuse using some 4-40 rod. Do you think that would be enough support the yak's stab.


Thanks,
Garret

p.s. To tell you the truth, I like that yak because my brother has the Aeroworks 50cc in that same paint scheme. My club has a big event coming up on the 4th of July at a closed/soon-to-be-demolished full-scale airport. We're looking to do a demo with the big version and small version.