My 4*60 Mag 91 and the only mods are long servo arms and C.F. rods
will hover for a good while... When I tried a Saito 100 on it,(about two
months ago) it would hover for as long as I wanted to hold it there.. Also
I could K.E. a few circuits and did a K.E. flat "8" with the S-100...
The 4*60 is my second plane, and I have quite a few flights on her for
a bit under two years