Just posted the Video of the SS with BP-21 (Balsa Products) Outrunner on my website. Beautiful combo! It would maintain altitude at 55% throttle setting and keep in mind that's at a "lead sled" AUW of 24.3oz!
I didn't like the stick mount setup they furnished so revised the mount to allow easy removal of the motor for maintenance and prop shaft replacement if it becomes necessary. Reamed out the mounting holes at an angle to allow angling of the screws to clear the motor bell. The pics show the result. The 8 X 4 HD prop presents no deterioration in flight ability!