Previous post shows results that came relatively easy.

What DID take an awful lot of effort to get it to run right, was a .50 class heli on gasoline, that turned out to be a multi-year effort, but in the end, it all worked out:


I started this project in 2015 or so, before the first plane engine, and it took about 3,5 years to get it right, sort of.

I would not really reccommend that to anyone but the most adventurous, though. It can be done, the engine has at least 15 gallons through it (and given how frugal it is, that is a LOT of flight time, and more than enough monetary savings to pay for engine, muffler, ignition and a few crashparts), but it also involved quite a bit of testing, trying, re-doing and frustration.