Hey guys, I'm also getting ready to put one of these planes together and am thinknig of going with one of the newer Thunder Tiger 4 strokes. The 75-s seems to be a great match for the plane but the I think the 91 might make it a bit faster. The 2 engines are about 8onces apart, the 75 at about 16 and the 91 at about 25. What do you guys think about my dilema? Do I need that extra power of the 91? Also what are your planes weighing in at? This is my first Pattern style plane. I'm a 3D guy so i'm use the the cg being way towards the aft. How do you tipically set the cg on a pattern ship? Thanks for the help fellas. Scott Hall