Ok cool. Thanks for the info.
I have a 46AX here in my trainer at the moment. I love that engine. I got it second hand from a guy at the field in my original trainer. The motor had done gallons and gallons of fuel, but still had lots of compression and had had the bearings done not long before I got it.
Tons of power, but as its a bit long in the tooth I might leave it in the trainer for slow sunday flights when I get good enough to fly the Ultimate.
I will weigh the SK .50 and the OS 70 and see which one is lighter. My guess would be the 2 stroke SK .50


I will also do the cross brace mod, aileron horn mod and brace the landing gear block.

Anything else I should consider doing?