Subject: Re: [baidarka] Superiority of Native paddles
From: Michael Daly (michaeldaly@home.com)
Date: Wed Jun 20 2001 - 22:58:35 EDT
From: "Peter A. Chopelas" <pac@premier1.net>
> > The AR is the length of the blade divided by the mean thickness. You've got the paddle
> > turned 90 degrees to the way it's used. That's how the equations you are using were
> > defined. Changing this arbitrarily, as you have, makes your results invalid.
> > .... Your use of AR is wrong. How can I be more explicit?
>
> What you wrote here is exactly what I wrote in my original posting, please
> go re-read it. AR is the span squared divided by area, it reduces to
> span divided by cord only in a rectangular platform. Where is my use
> wrong? You wrote exactly what I did, just differently
Let's try again. The flow is normal to the paddle power face. The chord is not
normal to the flow. You are using the width of the power face instead of the
thickness in determining the AR.
You keep insisting that the paddles are not used like this. I still cannot see how
you feel that this is so true. I look at dragon boat paddlers, racing canoeists
and kayakers and see paddles used nominally normal to the flow.
Mike
>
> >
> > You've assumed the velocities cancel out. I don't see why.
>
> You do not sound like you read the original posting because I gave the
> reason there.
>
I re-read it after posting and realized I misunderstood what you did with the velocities.
My apologies.
Mike
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