Shorty,

I too have the Alpha 60 and have flown it just for kicks with the stock 3-blade (13 X 4). While it does do it's job on keeping the airspeed down at full throttle, my engine only turns over 9500 RPM and it air brakes too much at idle, so I'll be changing to a 2-blade before my next flying session with the plane. I'll be running a 12 X 6 wood Topflight which is what I happen to have on hand. The 12 X 5 MAS should work just fine for your application.

When you remove the 3-blade you will need to take the drive hub with the flywheel to your vise, and using a socket that just fits over the aluminum hub but through the flywheel, drive the hub out of the flywheel. This will allow other spinners to fit the drive hub. Also remove the limiter pins and collars as they will prevent you from setting the engine. Since your going to a lighter 2-blade prop you will have to reset your settings - high-end and idle mixture, and possibly idle speed. Then your engine should come to life and run like its supposed to.

Also don't forget to check your balance since you are removing weight off the nose and learn to use the stick on the left to control your airspeed while in flight - you don't need to fly at full throttle, 1/2 to 2/3 throttle should be all you need for general sport flying.

Hogflyer