On 15-Jun-2005, "rick" wrote:

He's asking about kayaks. As I said, there is no correlation
between overall length and waterline length in kayaks.
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So, you're saying a 12' kayak has a waterline length the same as
a 16' kayak?

??? You can't read very well, can you?

I never said it had no effect on speed. I said the effect
cannot be determined by knowing overall length. If you have waterline
length and you are comparing _very_similar_ hulls, you could
make some estimation of expected speeds.
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I saw a statement that said length has NO bearing on speed. I
still see that as incorrect.

I can't comment on what you think you see. I didn't write any
such thing.

Take a look at this graph:
http://www.greatlakeskayaker.ca/LengthVsResistance.htm

It shows the resistance a kayak generates at a speed of 4.5 knots
versus the overall length for a range of lengths from 5.14m to 5.24m.
This data is taken from Sea Kayaker magazine reviews. As you can
see, the data is all over the place. The variation in length is
less than 2% but the variation in resistance is over 13%. The line
on the graph is a trendline (linear regression) and is showing
that there is, according to this data, an _increase_ in resistance
with length. You folks are claiming the opposite.

While you may wave you hands in the air and make claims based on
misconceptions, I am making statements based on what is found
in real kayaks being sold to real people in the real world.

Mike