Hey Eddie,
Yeah , you might be right about the 4-blade. I'll try it this weekend if the wind around
here ever drops under hurricane force !
I read in another discussion someone was using this prop on a 90 size Viper with a piped
OS .91 with good results but it might be a little light for the YS 1.10 .
APC has a 3-blade 13.8x13.5 they recommend for our engines but Dave Shadel doesn't
think the 1.10 will pull it. He should know I guess. I'll try them both next time out and let
you know.
Master Airscrew makes some 3-blades in the sizes that should be perfect but don't waste
your money. The center hub is so thick you can't install the double locking nuts , Ive tried.

tommy s