The Magnum XL .70 RFS, Saito .72, and the Thunder Tiger F-75s four strokes would also be good choices for this model. I believe most 4-strokes in the .91-size category would be heavy enough to make balancing the plane a challenge. A good .70-class 4-stroke tuned and propped correctly should provide more than enough power to punch out straight up from a hover given the plane's all up weight of 5.5 to 6.0 lbs.

If the price of most O.S. 4-strokes frightens you, consider that this model would be a good fit for the affordable FL-70 as well.