🚀 go-pugleaf

Regular troll


Tim Wescott <tim seemywebsite.com> wrote:

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> NNTP-Posting-Date: Wed, 14 Dec 2011 00:18:55 -0600
> From: Tim Wescott <tim seemywebsite.com>
> Subject: Re: OT  Efficiency of air propeller versus water propeller?
> Newsgroups: sci.electronics.design
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> On Wed, 14 Dec 2011 05:37:15 +0000, John Doe wrote:
> 
>> Are you familiar with the experiment. A water float with an air
>> propeller above the water, connected through a shaft, to a water
>> propeller under the water. Put a fan on the air propeller, and the float
>> moves towards the fan.
>> 
>> Can that be considered a demonstration of the efficiency of an air
>> propeller versus a water propeller? The air propeller is less efficient
>> than the water propeller, that's why the float moves towards the air
>> propeller?
> 
> Too many variables.  Make the "water propeller" one inch in diameter, and 
> the "air propeller" six feet in diameter -- do the results end up the 
> same?
> 
> Define efficiency.  Power efficiency?  Force vs. size efficiency?  Force 
> vs. angular velocity?  Number of replies per meaningless post?
> 
> Etc.
> 
> -- 
> My liberal friends think I'm a conservative kook.
> My conservative friends think I'm a liberal kook.
> Why am I not happy that they have found common ground?
> 
> Tim Wescott, Communications, Control, Circuits & Software
> http://www.wescottdesign.com
> 
>