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Thread: Speedo
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01-24-2005, 03:43 AM #1
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Speedo
Just got a 100 mph keller speedo.
Thought i saw a thead some time ago on a way to convert air pressure to speed?
Dale!
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01-24-2005, 08:44 AM #2
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mph= the square root of (pressure divided by .0145)
or
pressure = (speed divided by 8.417) squared
in physics it is expressed as "Dynamic Pressure":
Q= .5 X P X VČ , where P (rho) = 1.9376 and V is feet per second;
using this I calculated 60 mph (88fps) to be 52.1 psi
exact:
69 psi = 69 mph (kinda easy to remember for a couple reasons, huh?)
approximate:
20 psi = 40 mph
40 psi = 52 mph
70 psi = 70 mph
100 psi = 85 mph
130 psi = 95 mph
147 psi = 100 mphLast edited by Mark75H; 01-24-2005 at 08:50 AM.
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01-24-2005, 02:53 PM #3
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If you haven't checked out Teleflex's Instrument Technical Reference, I recommend it. Even if you don't use their gauges.
http://www.teleflexmarine.com/Pdf/In...TECH%20REF.pdfLast edited by LakeRacer99; 01-25-2005 at 05:47 PM.
Jason
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01-26-2005, 12:03 AM #4
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speedo
Thanks thats what i needed.
Dale!
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