Hi
There was a home made pitot in wooden boat magazine a while ago.
Basically a plastic fish tank tube with plastic straw ends in the water.
One end cut at a diagonal to face the water flow. The other straight.
The "display" consists of an inverted loop, in the tubing, containing
coloured water. Once it is calibrated at two speeds you can make your own
numeric scale.
Index and back issues on their web site.
Regards
Captain Kerry Thomas
kerryjthomas@gmail.com
-----Original Message-----
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
On Behalf Of Craig Carmichael
Sent: Wednesday, 20 February 2013 9:17 a.m.
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Measuring boat water speed for low speed & cost
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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