Any body own a TT GP .61 r/c engine (I mean the bushing kind) ??? How does it perform with a 12x6 or 13x6 prop?? I want to put it on a 7 and 1/2 lb Goldberg Tiger 60. This engine is low cost and did well in the MAN .60 review.

Francis

Nobody owns a Thunder Tiger GP .61 that they want to talk about ???

That bad ???


Francis

There's a guy in our club with one, and on the same airplane no less
It flys it quite well in fact, and makes a nice combination IMO. Not being my plane, I can't give ya r.p.m. #'s, but he's got an 11x7 (I'm pretty sure) APC on it. It doesn't have a lot of ground clearance between the prop and runway tho...

They are really a good engine. Since they are plain bearing and cheap, people expect them to break-in in 2 or 3 flights like the OS LA's. They take considerable time to break-in-it's the sleeve bearing, but perform well afterwards. A 12-6 is a good prop for them. They tend to not idle well, or slowly, when new, but I think this is caused by drag from a tight sleeve bearing.

The GP .61 has a simple air-bleed carb with a fairly small throat. If it had a fuel metering carb and was broken in well, it would out perform the Pro, in my opinion. The GP is really a .65, as I recall and the Pro is a .61. Cubic inches.

Thanks,

Sence I plan to convert to Diesel the small carb is a plus. My local friends have had good luck with the T Pro .46.


Francis

I have one TT 61
It was running very nice and start with just with one finger.
I had it on ultra stick 60 size and it was running vertically forever.