Another thing for the "gasser" fans to consider is that all 2-stroke engines are becoming a thing of the past due to enviornmental regulations.Snow Mobile, dirt bikes, outboard motors & now string trimmers are all going 4-stroke. Soon it will be chain saws & R/C powerplants. It will be hard for gas burning 4-strokes to meet HP/weight requirements for R/C aircraft in an economical package.