Re: [Paddlewise] Planing

On Fri, 18 Jan 2002 13:11:25 -0500
  "John Winters" <jwinters_at_onlink.net> wrote:
>
>I said quite clearly that planing began when the 
>wavemaking resistance
>dropped with increasing speed.

Perhaps earlier, but this time you added the requirement 
of that planing begin by internal power sources. (I am 
completely satisfied with the above definition of planing, 
btw.  The no external power source issue is what I object 
to.)

>> And how does it differ for a sailboarder, who also has 
>>no
>> internal power source?  I have often heard that 
>>described
>> as planing.
>
>Sailboards do have an internal power source. They call 
>them sails. The wind
>is the fuel sort of like gas is a fuel. The distinction I 
>made was between
>the forces applied by the water to propel the boat as 
>opposed to the forces
>applied by the water to retard it.

Hmm, forces applied by the water to propel the boat.  And 
here I thought it was gravity that propelled the boat on a 
wave, and that the water still provided drag.  You've made 
the physics much clearer now!  (Or maybe not.)

<sarcasm off>

John, the water still provides drag since it is not moving 
at the speed of the wave. Hydrodynamic drag is still 
meaningful, same as on flat water - having a sloped 
surface does not affect drag.  We can still define planing 
by your above definition, where the wavemaking resistance 
drops with increasing speed, without adding a requirement 
for internal power sources for that speed.  Why add such a 
requirement?
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