>Placing the mastbase further forward puts more pressure on the front of
>the board and makes the board sail flatter. This counteracts the
>tendency of the board to tailwalk when over powered and also allows you
>to point higher, since the additional waterline increases the lateral
>resistance of the board. It also makes the board slower, since there is
I agree here, in concept, but there is one big problem you haven't
mentioned which can get so big as to make moving the MFP a huge problem.
As the MFP comes forward, it "drives" (and I do mean DRIVES) the rocker of
the board, forward of the planing flat aft of the front footstraps, into
the chop, and this sets up a viscious "washboard effect" which can result
in less control than simply being over finned.
Compensating for too much fin, other than an immediate trip back to the
beach for a smaller or curvier planform, to solve the "too much fin"
problem, makes absolutely no sense to me.
Why would anyone "want" to sail a board/rig/fin combination that's
If you are a beginner, and have never experienced anything but the one fin
that came with your board, it's OK, as you do not know any better, YET!
But if you are an experienced sailor, and have a few fins, and know how to
change boards/rigs/fins to give you improved control/speed/comfort as
conditions change, I really don't know what to say, without getting myself
>So increasing the distance between mastbase and fin can make the fin
>sail smaller in terms of controllability, but it will also make the fin
>seem bigger in terms of speed.
Not sure how this computes, but if you are saying that moving the MFP
forward adds some control, I agree. But it does so at the expense of speed,
maneuverability, and overall ride smoothness, which is far too much to give
up, considering how long it takes to change fins.
>I think the best strategy is to start with finding the fin size you need
>to point as high as you want with good speed. These are somewhat
>subjective criteria, influenced by where you sail, and the kind of
>sailing you do. (For instance, sailing the Gorge in westerleys doesn't
>require a lot of pointing.) Use the mid position for the fin(s) while
>you're testing for size. Once you've found the right fin size for
>pointing, then adjust fin and mast foot placement to tune for the
>turning characteristics you prefer.
Unless we are talking wave or B&J boards, moving the MFP forward is only
something I consider in 3 situations on a shortboard.
#1 If I can't get on a plane, sometimes moving the rig forward will help
get the weight forward and the board up out of the water. But this is in
the most marginal conditions, and I can do better, in most situations by
pumping the board up over it's ow bow wave and leaving the MFP back where
it's efficient and the designed planinf "flat" works on the water at the
most effiient angle.
#2 If I really, really, need to go upwind, and want to present as much rail
(waterline length) as possible, but I don't care about the speed.
#3 If the wind has increased to point where the board is tailwalking and
I'm spinning out and out of control, moving the MFP forward will give me
enough control to get back to the beach to rig gear more sutable for the
conditions. Moving the MFP forward kills the speed, gives a terrible ride,
but can allow me to stay more in control on my way in.
>Now, let's talk footstrap placement...........
Except for the training position, all the way back, with a comfortable
spread between the front and back straps. Back footstrap, rear***even
with or a bit behind the leading edge of the fin.
If I can't get planing, stay planing with the straps in this position, I
need a bigger board!
sailquik (Roger Jackson) |Ph # in Md. (301) 872-9459
Lvl 1 WS Instructor | in N.C. (919) 995-3204