Re: [Paddlewise] speed with versus against the current

Kirk wrote;

>
>During a short race (an hour or less) I like to think my power output is
>steady/constant.  I know it isn't, just humor me.  I'm not sure where
>the higher speed was.  Are you saying that upstream we were going at
>a higher speed than downstream?  In both cases the first half of the
>race, downstream, we were dead even with other boat, within 50 yards
>of encountering a change in the direction of the current one of the
>boats pulled away.  The first time it happened we were competing
>against other people of similar experience and fitness/training.

Could have been going faster through the water. People react to adversity
differently.


(SNIP)

>
>> >The first time I experienced this was against a marathon flatwater
canoe.
>> >I attributed the difference to their boat slicing through the water as
>> >the water was displaced and ours riding up onto the water as it
displaced
>> >the water.  This time it was a Seda Glider versus a VCP Nordkapp.
>>
>> This is not likely a factor since canoes and kayaks don't plane in the
>> hydrodynamic meaning of the word.
>
>I didn't mean planing.  I meant that the recreational canoe hull was more
>likely to ride up onto the water and have more of a downward force as the
>water was displaced, versus the marathon boat forcing the water more
outward
>than down.

Not sure what you mean here. In displacement mode the pressure on the hull
always acts normal to the hull surface but that doesn't mean it has more
"lift" since the total hydrostatic forfec is equal to the displacement
regardless of hull shape. .

>
>> The Glider should be faster than the Nordkapp in racing conditions and
at
>> racing effort.
>
>So a simple psych-out is the answer? ;-)
>Maybe in the more recent case.

I would be proud of myself. If I can get hold of the Glider's lines I will
run a resistance check and let you know what the difference might be.

Cheers,
John Winters
Redwing Designs
Specialists in Human Powered Watercraft
http://home.ican.net/~735769/


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