I'm just beginning to build an LT-40 kit. I've read many discussions on engines for this plane, and it seems that most people prefer putting a OS .46 FX in it (or something similar.. BB type). Many say that something like an OS .40 LA or even .46 LA is underpowered.

Why is this? the LT-40 ARF seems to require a .40 - .46 engine, but the KIT version, which seems to be the same dimensions, recommends .30 to .40... and says that anything over a .40 is too overpowered.

Although this is my first kit, I think I should do a decent job of keeping it lightweight.. I'm new to this hobby, and plan to stay in it.. but I think an OS .40 LA would be fine for my first choice. If I want to move up to something faster, I'd rather buy a 46 FX (or AX) and put that in the new plane, and keep the 40 LA in my trainer. That way I could take both to the field if I like.

Also, I'll only be taking off from ashpalt runways. There are three fields near me here in the Los Angeles area, and all are paved. So I won't need the extra power that something like the .46 FX would provide on takeoffs. The .46 LA version might also be an option, since the weight and dimensions are almost the same as the .40 LA - but they also seem to be the same performance-wise, so I'm not sure I see the point in spending $10-$15 for no noticeable difference. (or am I wrong?)

I'm sure others will have suggestions for other engine manufacturers, and that's fine. Feel free to suggest that too. But is there anyone out there who has had good experiences performance-wise from just putting a .40 sized engine in the LT-40 kit? (like the instructions recommend.

Nothing wrong with being overpowered.. but I'm trying to keep the costs down. Building tools and supplies are eating me up at the moment!