I was on youtube and watch some clip that had a p-51 turning a 4 blade. I know because the plane was not started and I saw the 4 blades. The plane flew and took off great. I emailed him on youtube but he has not responded yet. The plane looked like a 60 size p-51. ....I am not looking for a scale sized prop just a 4 blade so if it is a 14 x ?? then that is fine.