ORIGINAL: Moki 1.8
Guys I just dont know what to do. I whant the plane to have plenty off power and everything, but a .91 just sounds kinda big. I have a .46AX and love it, I dont see anything wrong with the AX series except that there a lil mor exspensive. Now on the other hand, having a .91 on it is going to give some serious unlimited vertical. I definately like lots off power, just not so much were I have to start adding tons of tail weight either. Just gonna have to think some more I guess.
Moki,
Let me tell you about my experience. I have a similar frame to yours. I have a GP Giles 202 that is for 0.46 to 0.60 2-stroke or 0.70 to 0.90 4-strokes. After flying the airplane with a 0.61-FX, I decided to upgrade the engine to a 0.90 engine. I ended up installing an SK-90 2-stroke with APX 14x6, 10,000 RPM max. SK-90 is a $100.00 engine. The Giles' dry weight is 6-lb and 15-oz. I balanced the model without adding lead.
The airplane flyes straight level at 1/2 stick having a decent vertical momemtum if I do not add power. The extra power gives you unlimited power to perform any aerobatic you want including big loops and long verticals. The key is throttle management. At the end, I could not be happier with the power my Giles has. I have plenty of power for performing anythig I want. The 12-oz tank gives me 10-minutes for aerobatics with about 1/5 of tank spare fuel in case I need to delay my landing. Yes, I could have installed a 4-stroke, but I prefer 2-strokes for their simplicity of operation, maintenance, and cost.
By the way, I built this Giles from a kit. I checked everything in the firewall to support this kind of power.
Hope it helps.