ORIGINAL: zackesch
I do plan to build other 40 sized aircraft, but I would like to keep the trainer ready to use so i can can take my fiance, and other family members up. I figure its always good to keep a trainer on hand ready to go. You never know when you may need it.
The power difference between an LA .46 and the AX .46 is enough to notice. The AX will outlast an LA and they are worth rebuilding if the time comes, at least new bearings. I think of the LAs as throw away engines when the time comes but that a lot of flights.
As Mark mentioned a ways up in the thread, engine selection is one of those things called pilots choice. Some people like different engines a lot more then others. If you plan on flying for a while spend the money now on the AX. It's hard to go wrong when you buy the best.
I put one student into the .55 AX and it has been flying a couple of 60 size ARFs for two years, it doesn't haul the planes as well as a good .60 engine but it works in both 40 and 60 size planes. Just more food for thought.