the 46AX will hover twist from the reports I have read, make sure you have the right prop for ir though. I do have to agree, for unlimited flight you might want to consider a smaller 4 stroker like the Saito 72. Some users have modded theirs to accept the engine.

Personally i'd get the Magnum 52, OS 50 or the 46ax/fx to keep weight and costs down. OS 50 being the most $$ though

OS 50= about $150-160
magnum 52 xls= $79 on sale
Os 46 = you already have it, no money spent

have fun, go fly!!

matt