Re: [Paddlewise] Pygmy Arctic Tern

From: Alex Ferguson <a.ferguson_at_chem.canterbury.ac.nz>
Date: Wed, 05 Mar 2003 09:30:40 +1300
[Matt]
>The real reason for the Pygmy's multi-chine deck is to allow the paddle
>stroke to be nearer the kayak by cutting off the knuckle busting corner that
>sticks up and out further if those small deck panels are not present.

I don't know how you design it to get "knuckle busting corners" in (OK, CLC 
do). Draw a curve through the line that the multi-panel takes and it will 
be lower all the way unless the original design had the sides too high 
which seems to be a criticism that I keep hearing from builders of North 
American designs. I know of one person who nearly halved the height of the 
sides of the second (CLC) boat he built.

[Matt]
 >>The transverse curved decks of the CLC boats extend out beyond the side
panels making the deck hull joint stick out even farther (to have to be
reached over) but the curved deck did lower that seam some in the paddle
area so it wasn't both higher and wider as it had been in the original Pygmy
(the Queen Charlotte).<<<<

Again a design "flaw". There's no need to put a piece on the outside of the 
top of the sides. Because of the sheer clamp inside I know I can "grind" 
down the deck/side join a lot and get a curve there. Again, another builder 
here in NZ specifically complaining about the height of the Pygmy design.

>BTW, there only needs to be two panels to get a longitudinally curved deck
>center line.

>Alex responded:
> >>>>>With a curved deck you can still get a sheer line though the centreline
>
>won't "dip". If it does you either have the ends too high or the deck too
>low to get into the cockpit. A curved deck is made up of (usually) 4
>pieces, one on the foredeck, one each side of the cockpit and one aft deck.

Four pieces because 2 sheets at 2.44 metres per sheet (8x4 feet sheets) 
will be shorter than 5+ metres which is the average length of a sea boat. 
Four because it is easier and more economical to put one narrow piece each 
side of the cockpit.

Alex


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Received on Tue Mar 04 2003 - 12:32:06 PST

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