Vince, IIRC it is 40.2 oz including standoffs (mount), ignition, all hardware, and muffler. Bare engine with muffler is 33 oz. Remove the muffler from the front of the plane and exchange it for a pipe mounted mid-ship, and cut the fuel tank down to 10 or 12 oz, and this just might be a workable solution as the wet-weight will be similar to a nitro-fueled plane. Overall price is going to be similar to a YS or an OS 1.40 with pipe, and fuel costs will be cut by ~80%. (Probably will cost less than a 1.70, but the power may not be on that level)

The website claims 96 db on the stock "Pitts" muffler, or 91 db with "tone inserts" which cost 200-250 rpm on the top. On a carbon pipe (and considering the rear-mount carburetor) the sound level should be acceptable.

Great work testing this Matt. I look forward to the K-Factor article. I plan to buy the engine next summer.

One last thing. Todd Syssa has stated on another forum that he is open to cutting cylinders with custom timing. It may be possible to wring a fair amount more power from the engine with a bump in the timing to match a pipe (this may or may not be necessary, but is interesting nonetheless and shows a commitment to customer support).

p.s. I have absolutely no commercial interest in this engine or company, I am just very supportive of small businesses in our hobby, particularly those who manufacture their own wares in-house.