Larry,
We used the Stevens aero model ring rat 250 with all supplied electric package from Stevens, the only modifications to the kit was to relocate the battery, a 1250 lipo by thunderpower , to the r side of nose with Velcro for nose weight and better crash resistance. If left in the wing, it would break through the wing in a hard impact, allmodels were built by Mark Weiss, we also used the prop saver on the prop hub, to save motors ,