OPERATION PHOENIX JR. Phase 1- Hirth motor identification

[Backcountrydrifter]

Hello all! This is my first time posting so I will give a little introduction and background. My name is Ben and I am a professional pilot, paraglider, and A&P. But I only work on my own aircraft. Perpetual student and a sponge for knowledge. Certified MIG and TIG welder with a pretty extensive history in metal fabrication.

By some strange coincidence I have acquired all of the makings of a (likely) very bad, but very fun idea. Through a series of horse trades I have acquired a Hirth 650cc engine and direct drive cast aluminium propellor. 1974 vintage from what I can tell. I was told by the previous owner that it came from the CAF museum in Heber Utah. After a bit of research I believe it was the very first of the ultralight engines that Hirth made. The numbers don’t cross reference with the snowmobile world. And 1 plug per cylinder, and a direct drive prop make me believe it was an early model before they upped their game to become an ultralight and UAV supplier. A call to Their North American distributor informed me that they have no idea what engine I have.

I also acquired a airworthy hang glider wing and a small 2 man flycraft raft. So after a few too many long nights looking around the hangar, I am pretty convinced I have everything I need to make “OPERATION PHOENIX” a go.

Since i I was a kid, the movie flight of the Phoenix intrigued and motivated me to become a pilot. I think it would be fun to use up all the spare parts I have combined with my skills to make a small flying craft. I’m not fanatical about only using what I have but as an homage to the movie I would like to keep it in the spirit of using up the things available as much as possible. But I’m lacking a good bit of knowledge in the aeronautical engineering department and will have to educate myself more on thrust lines for pusher props, weight shift flying, and wing loading among other things.

I’m in no rush. And if this project is simply a hangar queen/conversation piece after its maiden voyage over water, then I’m ok with that. But I would love some insight from anyone with experience on the old Hirth motors and anyone with experience flying weight shift powered aircraft. I will need to fabricate a motor mount for the raft, along the entire assembly below the wing and set up motor controls.

My shop is right next to a large shallow lake so I have easy access to test and tune.

My question is this- who is the resident Hirth motor expert that may be able to educate me more on the engine as I begin the initial assessment?