Originally Posted by
haefeli
Tim, could you please tell me what rpm your engine runs on the ground and also the power it is supposed to produce. If I could I will look up the specs of the bore and stroke and try to make some educated guess's as to what I expect from my engine after the work I am doing to it. with the cost of the props I really don't want to have a lot of wall hangers.
The Zenoah G-62 is an ideal engine for the plane in my opinion. According to specs it produces around 5.5hp at 8500rpm. I have
7-8 of them. I have not flown it since last spring, but if I remember correct it was turning around 6700-6800rpm on the ground. The Biela 4 blade looks the best for scale appearance. The G-62 likes to turn RPM's the closer to 8000 on the ground the better. The best 2 blade is a 22-23x8.
I have a 5 cylinder radial I was thinking about repowering the Razorback with. My corsair has a 7 cylinder radial that I repowered this past summer. I have not had time to fly it yet.