I have a Dave Patrick Edge 540 27% (79 inch) that I put together this time last year. I put a Moki 2.10 in it and if that BME 55 was out it would have been perfect for the plane. I could do an engine switch if the BME 55 comes out this year. Or I might just sell the DPM Edge and put the BME 55 in a 50cc airframe (Yak). As I said in an earlier post the pound less of weight will make today's 50cc gas airframes tail heavy. But it'll balance really good in the 78-80 inch planes.