Per your post a few posts back, that Saito is likely a .91, not a 1.50, and. 12" prop is not unreasonable for it, depending on the pitch. You'll get great information from the guys here that will be useful. But my first recommendation, given you experience
, is to proceed slowly and keep your excitement in check. Be careful, think safety first. Be certain your plane is secured so that it can't get away from you if the engine starts and the throttle is inadvertently advanced somehow. You should get assistance, the neighbor who flys, to just keep an eye on you as you learn these new things. Minimize and mitigate any chance of injury to yourself or others in your learning process. Aside from that, welcome to the wonderful world of RC modeling!
hQQk