We pulled out the LA .40 and installed an LA .46 this week on A Mid Star, the .46 is by far A more suited engine for this little plane. The TT .46 would have been my choice but I didn't have one on hand. With the LA .46 I can do A loop that takes up the whole sky so the TT should be A lot better. Take A peek at the SK engines too, I like them as much as OS and TT engines.