Originally Posted by
rcguy59
Even at 23,000rpm, pitch speed of a 5" pitch prop is only a bit over 108mph. Little airplanes are very deceiving when it comes to speed. It sure doesn't make them any less fun, though. Here's my Screamin' Demon with a 32SX, Macs pipe and APC 8-7 prop. Static rpm is 18,000+rpm. It's in the 130mph range with GPS telemetry data. Looks like my Bearcat will get a 32SX. I've got 7 of the little jewels.
https://www.youtube.com/watch?v=pa0jmNXeMU8
I have a couple of those engines in that size, and yes, with an 8x8 getting around 18,0000, 1/4 wave pipe, it is a great set up.
So yah, I think a .32 will be just fine in the Bearcat. Back in the day, there were a lot of arguments about engine size, but when you went to contests, pretty much everyone used the OS .25. The reason why is it was so reliable. The MVVS was good, but more finicky to tune.
Airhead152, Do you still have any of the OS .26 4-stroke engines going? The ones with the car cam? I always found that to be an interesting project that I had heard about.