> Thanks for your help in advance.
> I have a Bic Astro Rock (120 l) that I sail with a 7.0m cambered sail
> I am wondering if my fin, a stock "race 33" that is 13 inches long and has
> an area of 42 square inches might be too small.
Well, 13 inches (33 cm) is a bit small for a 7.0 sqm sail. I usually use
a 36 cm fin with my 7.0 and in winds in the lower range even a 38 cm fin.
(14.2 and 15 inches respectively). (But then, I am not exactly a
> Also would shorter harness lines help to keep more pressure on the mast
> I have a seat harness and when I am hooked in the boom is at an arms length
Well, shorter harness lines won't help you much, I think. I have never
noticed much correlation between harness line length and spinout.
> I bought this gear last fall ( my first "modern" equipment i.e.:
> shortboard, full battened sail)
> I've been hooked in and sailing quite fast, but I seem to be stalling out
> when I get back near the foot straps which is a problem because eventually
> I get launched.
I suspect what you have here (even though the fin is probalby a bit
small) is also a problem of proper technique. I guess you are exerting
too much pressure on the fin when you are not yet fast enough. Try to
really bear off wind before going back into the straps. Move back in
small steps and let the board accelerate, get into the straps, close the
gap (the board will still get a lot faster, when you do this) and only then
go back to a beam reach or even head upwind. But when going upwind,
watch your speed. If you let too much speed drain away, you
will eventually get a spinout. Remember that the faster you go, the more
load a given fin can take.
Hope that helps a bit,