All the LA engines I have seen are typically marginal for flying from a grass field and/or in winds above 10 mph. They just do not have the power.

I would go with the AX. If you don't want to go the extra money for an AX, look at the Super Tiger 45, Thunder Tiger Pro 46 or the Evolution 46 engine. These are ball bearing engines with plenty of power and, as you can see, the price difference between the 46 LA ($65.00 ) and these engines is neglidgeable. Super Tiger 45 ($70.00), Thunder Tiger Pro 46 ($80.00 ), Evolution 46 ($90.00)

For a $5.00 - $25.00 difference I know I would want the extra power.

FWIW - The Evolution engines are broken in at the factory - just mount and run.