I just put a .45 ST ABC engine on my first plane (Avistar). I propped it with a 10X6 and thought that would be appropriate until someone suggested 10X4 earlier in this tread. Any thoughts?

BTW it took alot more weight in the tail than I thought, and thats with my battery behind the servos. Has anyone else had to add significant weight to the tail (like 8 quarters maybe more)?

Jeff