I personnaly love the Testors pipe bomb engines. Yeah, I know, it's really only a pipe bomb engine if it has the pot metal case. I call all the Fly Em' engines pipe bomb engines. A stock pipe bomb will give performance on par with a Cox Babe Bee engine. With a Cox rubber ducky 5x3 prop, I find I get between about 13,900 and 14,700 RPM using the standard Testors plug and 25% nitro. I've never run these with the Testors props, so I can't tell you how they perform with those. Also, I wouldn't prop these above about 16,000 RPM. I've heard from a member on another forum that he broke his crank running it up that high. Again, I don't know this for sure, as the props I've used in the past haven't broke the 15K barrier.
There are no commercial engine mounts, nor any convenient way to modify a commercial mount. I have made several mounts of my own for these. Some complicated, a couple very simple. Depends on what you want to mount these to. Here's a quick motor mound I slapped together in about a half hour. Just needed something to test a pipe bomb engine that I had just cleaned up and cut the tank back off of. I forgot to recharge the battery on my camera, so you don't get to see em lean the engine out. I think this is the one I was getting 13,900 out of:
You need to keep the plane weight below seven ounces to get any real pep out of them. They will fly a plane of up to around 10 ounces. That's the largest plane I've flown, but it only did roundy-roundy:
And for all you guys who think these engines are gutless wonders, I'll gladly take them off your hands.
Mark