Yeah, I bought a used Futaba 6EXA from one of the guys at the field. I've used it on the nexstar but haven't experimented what all it can do. I've also been told that the .46 FX will work fine on the UCD if I use the right prop, which is understandable. It'll hover probably. I'm thinking either the YS .63 or the OS Surpass 70 II. Both fairly inexpensive and very reliable. I've also seen both been flow. I hope I can fly both myself before I make my choice.