Thanks.
Assuming the center of mass is at 101 and a 20 +/- lb. battery is at FS 9 and it moves forward 6" or so to FS 3, then that is an additional 120 lbin of moment to counteract the engine. I estimate the engine is at FS 143 or so. This will counteract about 3 lbs of engine weight which is not enough. Is this correct? I guessestimate that my engine will weigh about 320lb total and the original engine weight for a O-235 is about 252 lb. So I need to make up about 70 lb which is about 2940 lbin of moment which is about 30 lb at FS 3.
If so, I need to get my engine weight down and make sure I don't get to have too much. Otherwise, it sounds like I will be adding alot of ballast.
Does everything sound right on my calcs?