At 16:02 15 November 2013, Steve Leonard wrote:
Well, James, now you have gone and confused AoA with lift
coefficient. You do not necessarily double AOA to double lift
coefficient. Lift coefficient generally goes up about. 1 per degree of
AoA while you are below separation of flow on the wing surface. At
some point on the curve, doubling AoA doubles Cl, but only at that
one point. And I would guess that point is no where near where you
operate on a winch launch.

No confusion in my mind ... when I mentioned doubling I was just
pointing out that the difference was substantial. I could have been
less conservative and said 'tripled' or 'quadrupled'!

If you look at a typical graph of lift coefficient vs AoA you will see
that to double the lift you can expect to much more than double the
AoA. (Although the curve is substantially linear for most of the AoA
range, it doesn't pass through the origin). Not that I said anything
at all about doubling the lift!
J.