ORIGINAL: jeffie8696
I like all my Thunder Tigers, even my old baffle ported 15.
As I have often said, the Thunder Tiger GP42 is probably the most reliable engine in its class and is totally underrated.
I have one on my Thunder Tiger Pitts 40 ARF. The other is on a Phoenix Models Sonic Low Wing .25 ARF that is stupidly overpowered yet perfectly balanced by the GP-42.
The GP-42 is such a terrific engine, I can't believe more guys aren't flying them. The one on my Pitts 40 was tuned slightly rich and was turning a MA 10x6 right out of the box on its very first tank of fuel at 13,500 rpm.
You can spend a lot more money for a .40-size two stroke, but you can't buy a better engine than the TT GP-42, TT Pro .40, or TT Pro .46. They are all three simply superb engines.