Hi there thanks for the speedy reply, just as you were replying i fixed the issue, it appears to be with stock parts. i did not load b9 as i am trying to keep my memory usage down, after installing b9 i relised the problem is with stock parts, specifically the stock aerodynamic parts adding b9 removes the need to use stock parts and has provided a somewhat temporary fix that i am happy with, thanks again for the reply this work is amazing and has added huge amounts of fun (and rage) to the game.