Re: [Paddlewise] Bad forward sweep

From: Nick Schade <schade_at_guillemot-kayaks.com>
Date: Wed, 9 Jan 2002 10:10:49 -0500
One of the goals of leaning a boat is essentially to give it more 
rocker. Even a kayak with a very straight keel will appear to the 
water to have a lot of rocker when leaned to one side. The degree of 
lean or edging required to get this effect will depend on the boat, 
and leaning by itself may not be enough to make some boats turn, you 
will still need to apply a steering force with a sweep.

As you turn, your center of gravity wants to stay going straight. 
This can actually accelerate the rate the boat turns. As you initiate 
your turn the bow will be exposed to water pressure on the side that 
is on the outside of the turn, actually so will stern. But if you 
lean forward slightly it will drive the bow down, causing the 
pressure on the bow to increase while decreasing the pressure on the 
stern. This by itself might be enough to get the boat turning. You 
will also may get a small amount bow-down pressure just do to 
deceleration (like applying brakes in a car,  where the car leans 
squats in front slightly).

To continue the turn, the stern needs to slide sideways through the 
water faster than the bow. Leaning towards the outside of the turn 
will turn any "skeginess" at the stern away from the sideways moving 
water making it easier to get by. But if the general flow of the 
water is still along the length of the boat, it will want to stay 
going that way. You somehow need to break the stern free of the 
flowing water and get it moving some other direction. The best way to 
do this is pulling in strongly towards the back of the boat at the 
end of your sweep stroke. Once the water is flowing side ways across 
the stern and the stern is swinging outwards more freely it will tend 
to keep doing that, until you change something.  To stop the turning 
you generally only need to return the kayak to an even keel, although 
some boats will continue turning until you stop it with a slight 
sweep on the other side.

Nick


-- 
Nick Schade
Guillemot Kayaks
824 Thompson St
Glastonbury, CT 06033
(860) 659-8847

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Received on Wed Jan 09 2002 - 08:09:53 PST

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