Rolf,
I've found my notes:
32 on a loose guage on the forestay will yeild a tow in of 25mm on the glass T4.9 platform that I measured and 30mm on
the timber T4.9 platform without a sub deck.

Regards,
Phill

I know that the voices in my head aint real,
but they have some pretty good ideas.
There is no such thing as a quick fix and I've never had free lunch!