I have a HiMax 2812-0650 in Efilte Ultimate. I am not a fan of gear boxes, more to break and they are louder than outrunners. I get 20+ minutes of mixed flying with a 1320mah lipo running an 11x4.7 APC SF prop. If I had to do it again I’d get a 2812-0850 though. The HiMax outrunners are relatively inexpensive, I think under $60, and come with 3 different mounting options including a stick mount so it screws right onto the Ultimate.