TT GP .25 & GP.42

[Steven Kientz]

Does anyone have any experience with either of these ? Was thinking of purchasing both for sport flying. I thought the .25 would work on some of the older combat planes, and the .42 would be good for .35 size planes.

Steve

[Alan Hahn]

I think the 25 is a good choice for high rpm/low pitch flying, just like the FP25 and LA25.

I am guessing the 42 is a little trickier, just like the FP and LA 40's. Some can get them to run in a nice 4-2-4, or a rich 2 stroke, but others have issues with run-away. I don't know how many run the FP40's in the high rpm/low pitch mode which might work well. But I am guessing that you can find some mode of getting it to work. I am sure that others will weigh in soon with some more concrete info.

[richardhfcl]

I don't know about the TT .25, but the TT .42 is a real power house and easy to needle.  Mine have the boost ports plugged by Leonard.  Typically, I
run a twelve five and get substantially more power than I do with my stock G21-46's.  I've been using them more for 46-sized planes than 35-sized,
though.  For the price, they're real bargains!

[Chris Gilbert IRL-1638]

I've been having a lot of fun with a TT25 in a flight streak. I use a 9 x 6 prop and fly it 60 ft lines. I use 5% nitro fuel.
Enya No 3 plug.

I think it's more powerful than the LA25, that's my perception, but I've never done a direct comparison - same model, different motor.

The streak it's in is a rebuilt ARF with a heavy duty fuselage (full length ply doublers) and lots of epoxy (it's been through the wars) and it does a very neat pattern with the TT 25 doing the hard work.

About 60 cc (~2 oz) gives me enough time to fly the full pattern.

Nice little motor, first flick starts are not unusual

[Steven Kientz]

Thanks for the input guys. Sounds like my wife will have to put up with two more noisy things.

Steve