Crawf - I'll try that later, sounds about right
Clovus, Rowdy, thanks for that! I think I know what the problem was, I was using cut down fins like the "big fast boys" on Dark Side - it might be OK for them doing 100mph but not me (less control, more sideways "slip"). I've added removeable extensions now and see it that improves it!! [:@][&:]
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Wind farms - is that where they grow baked beans???