Well I appreciate your insight I would say that I get like 10-25 flights maybe. It has not happend on the blade 400 but my rex has had it happen 3-4 times and it is just frustrating beacause all I worry about the whole flight is that belt shredding. Also on your B400 do you get a build up of belt material on the guide wheel on the tail mine has some black from the belt almost like a skid mark? just curious while we are on the subject ? So belt tension should be about half way when compressed just near the gear? Thanks for your insight.[sm=50_50.gif]