The Kayak Forum is Sponsored By
|
|
|
| |
Kayak and Canoe Design Bulletin Board
Re: Another Online Design Philosophy Resource
Posted By: Nick Schade In Response To: Another Online Design Philosophy Resource (Jan Gunnar Moe)
Date: Thursday, 10 June 1999, at 10:27 a.m.
> John Winter do analyze effectiveness in water and ends up with the result
> that length of kayak above waterline is useless length. Correct, I
> believe.The typical statement "this kayak is X feet long, therefore it is fast" is not worth much. What matters for top end speed is waterline length, and for most paddling most of the drag comes from surface drag of the water trying to move along the wetted surface of the boat. So for flat-out speed, what is above the water does not matter.
However, the waterline moves with waves. What was above the water changes to become below the water. This can effect the speed and other handling characteristics.
> The Mariner people do make a point that rudders do deliver increased
> resistance while moving. Here I have a small problem with their thinking:
> As long as leaning a hard chined boat will result in turning, I will
> believe that not leaning this boat will create turning forces boath ways.
> As these turning forces will cancell each other, the boat will go
> straigth, but the ch8ines then, I believe will move the water in a more
> disturbed way than if there were no hard chines enabling leaned turns.John Winters has done some quick analysis on hard chined boats. His data suggests that hardchines do not introduce much efficiency penalty.
| |
Kayak and Canoe Design Bulletin Board is maintained by Nick Schade - Guillemot Kayaks with WebBBS 5.12.
|
Boat Design |
|
|
|
