The only problem I have with recommending the LA engines is that they have an air bleed low end adjustment. These can be very finicky and hard to set the low end for even experienced pilots, but can be pure nightmares for beginner's if they have to mess with them. The AX has a needle adjustment for the low end and is a bit easier for beginner's to use. As far as the power goes the LA has more than enough power to pull the LT-40 around the sky!!!

Ken