RE: Tower .75 any good?
I first put a Tower .75 on my Bobcat too....and experimented with all available props. With 11X7 APC prop I was able to get a top speed of 110 mph on the radar gun. I then put a Magnum .91 on it and tried all available pusher props for that engine. Didn't get any more speed with the .91 so I went back to the Tower .75. I have a Graupner 11X8 on it now, turning 12,500 on the ground. Haven't got it on the radar gun with this prop yet but it definately is faster.