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chewi
regular

Reged: 08/10/2007
Posts: 113
Loc: Poole

Re: Current speed and log

15/05/2008 17:34

I think Sarabande has it...
At speed the energy in the flow would turn the impeller, in slow currents it will catch, and have to overcome static friction (stiction) to get the impeller to turn. Sometimes the flow will be too weak to do anything more than occasionally move it, hence the substantilally reduced reading. A perfect transducer wouldn't do that, but we probably wouldn't pay the price.

Post Extras

Entire topic
Subject	Posted by	Posted on
Current speed and log	Roberto	15/05/2008 15:58
Re: Current speed and log	moody1	16/05/2008 07:53
Re: Current speed and log	DogWatch	15/05/2008 19:03
Re: Current speed and log	chewi	15/05/2008 17:34
Re: Current speed and log	Kermudjon	15/05/2008 17:39
Re: Current speed and log	chewi	15/05/2008 18:29
Re: Current speed and log	Roberto	15/05/2008 22:24
Re: Current speed and log	chewi	15/05/2008 23:31
Re: Current speed and log	Drascomber	15/05/2008 23:55
Re: Current speed and log	MoodySabre	15/05/2008 17:29
Re: Current speed and log	Kermudjon	15/05/2008 17:24
Re: Current speed and log	sarabande	15/05/2008 16:48
Re: Current speed and log	Danny	15/05/2008 16:40

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