RE: OS LA or Tower 46 Engine for Trainer?
The LA 46 will be fine on the Tower Trainer, since its not as heavy as some of the larger trainers (Kadel LT 40 or the Nexstar) but a ball bearing 46 is a much better investment. I've messed with the Tower 46, the TT PRO 46, and the OS 46 AX. For my money, the best VALUE is the TT PRO 46. All the power and reliability of the OS with the cost of the Tower. The Tower 46 takes longer to break in, and requires more fiddling than the TT Pro 46.
Brad