There are two sides to the speed equation, displacing and planing. In the displacing situation your increased wetted surface area will increase your speed. That is why course boards of higher volume and longer length will be faster in sub-planing or displacing conditions. On the flip side when you are in planing conditions the less you have in the water the better, henceforth you want to decrease your wetted surface area as much as you can. Of the two conditions it is probably apparent that planing conditions are faster than displacing conditions by virtue of less drag. The tips in this article are intended for when you are planing. They, however, may help you get planing as well as go fast.
With the science of it out of the way you are probably wondering, "Well, how do I go fast?" Well I'll tell ya! Here are ten tips which I read about and have put to practice with outstanding results. I have gained about 20% in speed and want to pass them on to you so that you too can enjoy the need for speed.
Many people keep a lot of their weight on their heels when they
are learning. This may, however, keep you going up wind it doesn't help
your speed because when the board is railed that increases your drag, therefore,
slowing you down. A flat board is a fast board. So point your toes, keep
the board flat, and sail upwind by sailing off the fin like a dagger board,
not your rail.
Once you are planing, start pressing with your rear foot laterally
against your fin. This pressure produces lift and increases your speed.
It is a lot like when you are water skiing outside of the wake and you
catch up with the boat by pressing against the flow of the water causing
you to be projected forward. The same applies to windsurfing, so press
hard and you'll go much faster.
By doing this you reduce the amount of weight on the board, committing
more weight to the rig and this reduces the drag on the board. You might
even want to roll your boom to your finger tips to get that extra extension
you need.
This relates to point #3 because this allows you to get more extended
from the rig and you become more sensitive to the load on the rig. If you
have a super wide grip you will be dogging it and going slow.
Rather than just pulling in your sail with your back arm, let the
sail hold you up by lying out over the water. Don't sit out over the water,
lie back. This also gets your weight away from the board.
Once you have gotten more confident in getting your weight out over
the water there is a tendency to over do it and the rig starts to lean
to windward. This has the effect of choking off your power. You want to
keep the rig vertical as much as you can. You can accomplish this by extending
your hips toward the sail by bending your knees.
If your lines are too long you end up sitting down and not lying
back into your harness. When you sit you start re-applying that weight
you lost by getting into the harness to the board again. By lying back
the wind takes the load of your butt. You should be on your tippy toes
to get into your harness not bending your knees. So shorten them up and
go faster.
A quiet sailor is a fast sailor. Basically stop adjusting your weight,
sheeting angle, and direction every ten seconds. Once your heading in the
direction you want to go, get into a stance and lock it in keeping your
upper body stiff. Let your knees absorb the bounce in the board.
When closing the gap you will notice the biggest change in your
speed next to getting your weight off the board and into the harness. You
get the aerodynamic benefit of "end-plating". This tip goes with tip #5,
when using your body to sheet in you will also be able to rake the rig
back to close the gap the foot of the sail makes with your board. This
has the effect of producing incredible lift in your board.
This is very important once you are in the straps and is the ultimate
in getting your weight off the board. If you can lift the front of the
board, there is almost no weight on the board so therefore you are going
fast. While you are leaning out in the harness, and in the straps, lift
upward with your front foot and your board will feel like it is getting
unglued from the water and you should be cranking.