ORIGINAL: rcjetflyer0718-RCU
ORIGINAL: Gray Beard
I have run several trainers with the LA .40 and it really is under powered for even a 40 size trainer, I'm flying on hard pack too. I get away with using them but it isn't my first choice. You can try a prop like an 11X4 APC, maybe some bigger foam tires. Fuel isn't going to help you at all. Bigger engine is maybe the best choice.
If I had my way OS would stop making the .40 and just have the .46. The difference between the two engines is night and day. You wouldn't think so but that little bit of size difference makes a big change. There are also a lot better choices in the cheaper engines then the LA series.
If your going to be flying from A GRASS FIELD YOU MAY WANT TO LISTEN TO THE REGULAR PILOTS THAT FLY FROM THAT FIELD. tHEY KNOW THERE HOME TURFF.
Actually the OS LA 40 was discontinued almost 2 years ago and only the OS LA 46, 25, and 65 is being offered now. Tower still has parts available for the LA 40.
Maybe that's why I keep getting them in trades?? I don't buy or use the smaller engines these days except on trainers. The .40 is a good running engine but I had a lot better luck with the ,46.