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 Post subject: something new,kind of
PostPosted: Fri Mar 25, 2011 12:38 am 

Joined: Sat Oct 27, 2007 3:44 pm
Posts: 376
It's been dull on the engine forum so it's time to write something. In r/c helicopters there are a few engines that havent been made into RC/CL engines simply because they are supposedly specialist engines. One such engine is the Thunder Tigre 39H. No comparable aircraft engine exists in the engine manufacturers catalogue.
So I got to wondering if this engine had any potential. The easiest was to look at the specs of the both engines. Amazing they both have the same bore but different stroke, A quick check of the parts list showed that they both used the same crankshaft so only the rod and liner were different. Even better you could use the same head as the 36. So with a minor exchange of a crankshaft,head and a thrust washer you now have a upgrade in power if you need it. How does it run. Haven't a clue but I think I'm going to convert one and find out. Thunder Tigre 39's show up all the time on the various forums and they are reasonable. Suprisingly enough the other parts are not outrageously priced like OS and you can afford to convert it.
We all know that the Thunder Tigre 36 is a really great powerplant surpased only by Randy Smiths Aero Tigre 36 based on the TT36 case,crank ,head but different P/l and perhaps rod and wrist pin. Since I've never taken one apart I can't say for sure.
I'll let you know when it's done and run and let you know the difference, bad or good.

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