By a knotstick...eg www.knotstick.com
From my HTC Sensation 4G on T-Mobile. The first nationwide 4G network
----- Reply message -----
From: "Craig Carmichael" <craig@saers.com>
To: <electricboats@yahoogroups.com>
Subject: [Electric Boats] Measuring boat water speed for low speed & cost
Date: Tue, Feb 19, 2013 12:16 pm
From: "Craig Carmichael" <craig@saers.com>
To: <electricboats@yahoogroups.com>
Subject: [Electric Boats] Measuring boat water speed for low speed & cost
Date: Tue, Feb 19, 2013 12:16 pm
In my e-outboard tests I couldn't measure the speed of the boat. I
bought a pitot tube, but the speedometer I found for it goes from
0-60 MPH and the first marking is at 10 MPH. The next one is at 15.
(From 40 to 60 each MPH is widely spaced - exactly the opposite of
what's needed.)
Blowing into the pitot tube, it takes all the pressure I can make to
move the needle just a little.
There must be some more sensitive transducer that can be used with a
pitot tube? Or is there some other way to measure speed that doesn't
cost a lot?
Cheers,
Craig
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