Re: [Paddlewise] loading trim with and without rudders

-----Original Message-----
From: Matt Broze <mkayaks_at_oz.net>
To: paddlewise_at_lists.intelenet.net <paddlewise_at_lists.intelenet.net>
Date: Friday, September 03, 1999 6:12 PM
Subject: Re: [Paddlewise] loading trim with and without rudders

(SNIP)


> I'm not sure there would be enough extra drag to be
>that obvious but a hull that is out of trim to the stern will add more drag
>than one that is equally out of trim (down) at the bow. Level trim should
be
>the fastest. I don't know how big this "out of trim" effect is at cruising
>speed (and have asked John Winters if he had any data on this several
months
>ago because some of the kayaks Sea Kayaker reviews do not sit at level trim
>and I felt our drag calculations should reflect this (if we could find any
>applicable experimental data to use to quantify the effect).

(SNIP)

I did get some information using my current prediction program but after
trying a number of different boats I found the results inconclusive. Some
performed better trimmed bow down, some better stern down, some had little
difference at all.

In short, it appeared that each boat responded differently to trim and the
same boat might respond differently under differing loads.

I wish I could say that trimming one way or the other always produced a
particular result but I can't. Admiral Taylor said that trim did not make
much difference. I just don't know enough about it to say.

Cheers,
John Winters
Redwing Designs
Web site address, http://home.ican.net/~735769

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