Well I'm having a little trouble getting mine to balance correctly! It's seems very tail heavy at 1.75 to 2 inches behind the spar, thats even with my engine and battary has far forward as possible. Thats also without the tank,prop, or spinner attached but I don't see how they will make that big of a diffrence. I'm also debating to counter sink my engine or not, and comments on which might be better? Here's a few more pics of mine by the way!