Many thanks to you Joseph for reinforcing the difference in KE between Vortex and strip (though not quite as extreme as I got - But probably much more acurately) I feel vindicated.

Geoff - Fantastic find - Everything needed, and by your component method.

Ed - Hope you are not too dissapointed in the KE produced by Vortex - Vortex speaks for itself. (compliment).

Roger.