I received this engine in a package deal with a Bud Nosen giant p-47d in the mid 80's . I have no idea what it is and figured some of you veterans might be able to identify it.

My guess is a Big Roper, sold by Gene Horner.....I converted on once, good power but a shaker....

I've got one and I agree with RCIGN1 fully that it's a shaker and the power seemed adequate. I soft mounted it and still had to safety wire every screw on the airplane if I wanted to see that screw at the end of a flight. I thought the prophub was a little suspect as it threaded onto a rather short engine stub shaft in front of the flywheel. I suppose the engine could be disassembled and the crank reworked to achieve some better balance, and If you have acess to a lathe, you could remake a hub with some screws to help lock it to the flywheel kinda like the Fuji's do. There are a lot of reliable, good running engines on the market today with excellent product support. Do a bunch of RCU Forum searches on any of them and you'll read about the good, the bad, and the ugly - - the guys whose posts I have read generally seem honest and have something to say and are willing to take the time to read all this stuff and post replies. Bottom line - - The airplane your building is a lot of time and money. In my opinion, if you really want to get some use out of that engine, get a small rowboat on a lake and about 50 feet of anchor line.

TJ