RE: CDI Location
Oh my. The engine weighs 35 oz. The lead weigh almost as much as the engine!
Let me do the math here for moving the engine forward. The distance from CG to lead is 7". So, 30 oz times 7" is 210 oz-in, the amount needed to balance. The distance from CG to the center of the engine is currently 10". So, 35 oz times 10" is 350 oz-in. In order to balance w/o lead, I need 560 oz-in (210+350) from the engine. That means 16" from the CG (560oz-in divided by 35 oz). So, I need to move the engine 6" forward in order to balance. That's a lot of distance to move!
I think I'm going to try to add lead before move the engine forward. I built the plane as light as I could; so maybe 30oz lead is not going to be too bad. Where can I find that much lead for cheap?