Hi Rendegade,

It's happening in outside loops from the top. I have not tried it inverted from the bottom yet. I think it would be an issue in any manoeuvre where throttle is being used in a vertical downline. When the tank is full it does outside loops fine. It's only after using about 1/3 rd of a tank that the issue shows up. In the sportsman sequence I would have used ~ 1/3 rd of a tank by the time outside loops comes up.

I suspect that on a vertical downline the clunk is completly out of the fuel. If I was at idle it would probably be ok because it would be sucking less fuel. The more I think about it the header tank may be the best solution however I will try the OS clunk first.

With a header tank I assume it would still suck air into the header when in a vertical down line. Not sure if this would present an issue or not.

Cheers
Jason.