Anyone know the diameter and pitch of this prop? I'm going to try it on my YS 53.

I believe that I read where that prop is designed to run quietly and be effecient at trainer speeds, say 50 mph, plus absorb that particular engines power at those speeds. I run a three blade MA 12x6 on my .53, the prop hole is a teeny bit snug but I run it that way. Also MA three bladers are balanced at the factory by drilling the hole at the prop cg. I have several and none has needed to be balanced.

The prop size is 10.5 X 4.5 3 Blade.

Pete

IMHO, 3-blade props on a trainer system is a bad idea. Never mind how much better or worse the performance is, the typical newbie is sure to break that first prop in short order. Now, he's stuck having to buy a new prop AND a new spinner, or cough up some bucks for another 3-blade prop. That's if he can find one in the LHS. I saw this happened to a new guy at our field. He ended up ditching the stock spinner and bought a 10x6 and a new spinner.

Anyway you slice it, it's more hassle than the RC newbie needs to worry about. They should just KISS.

My $0.02.