Im looking into buying an engine for my hot dogger, and have 2 engines to choose from. a gms .40 and an la .40. they both cost about the same, but which is better?

The word "hot dogger" and the two engines on your list just won't work. OS .46FX or AX is a good place to start. Dennis

The GMS engine is a real screamer, actually.

Have to agree with that, my GMS .32 is a Hot Rod.

There were some Super Tigers at the field today. They are absolute screamers! Also very inexpensive. They are finicky to tune, but all the owners really loved them for high speed/sport flying.

The .40 LA is a reliable engine but about as exciting as a hamburger bun.

Check out the Thunder Tiger Pro-46. That's a hot little package for the price. I put a Perry carb on mine and it truly IS a hot dogger in my Goldberg Hot Stik. As much plane as I can handle.

I had a Super Tigre G-51 with an 11X5 prop and that was a perfect marriage with my Kangke SK-50. Fast and maneuverable. Lost her last October at a fun fly coming in upright for a limbo event. Did a half roll at eye level at full throttle, made the inverted pass and touched a wing tip to the ground rolling back to upright at eye-level . . . almost. What looks like a true lineal roll at 100 feet appears less so at six feet. Talk about a re-kit. Hot-dogging and dumb thumbs at their finest. The ST51 was a bit finiky but an optical tach helped immensely. Mine prefered 10% Nitro over 15%.

Speaking of Kangke. I have one of their .50 engines that was a P.O.S. 24 consecutive dead sticks. The club two-stroke guru pronounced it "impossible to tune". Then I swapped out the carb for a Perry. It's right up there with the ST G-51 now! I'm really a fan of those Perry carbs. I ended up with one on my Thunder Tiger after a dirt nap damaged the needle valve collar and I couldn't keep it tight. Added about 800 rpm to the top end and it gets there quicker (no lag). They are VERY finiky to set initially but once set are contented with most conditions.

The TT .40 is also very good. I think it is more powerfull per displacement than the TT .46.

The .40 and .46 cousins typically share the same stroke & crankcase. The increased displacement is usually accomplished by a larger bore which results in the thinner (and lighter) cylinder liner in the larger engine. Less weight and more power over the smaller cousin.

i would go for the 40 La