Today's Message Index:
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1. 02:16 AM - Re: Airspeed Sensor Switch (D Wysong)
2. 09:08 PM - Re: Airspeed Sensor Switch (D Wysong)
Message 1
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Subject: | Re: Airspeed Sensor Switch |
> Hi All,
> Does anyone have an idea what 60 knots equates to in PSI?
Hello Troy,
The math says the differential pressure (Pd, Ptotal - Pstatic) is
equal to 0.5*airDensity*V*V for a given velocity, V.
60 knots is roughly 100 ft/sec. Assuming a standard sea level density
and slogging through the ugly units conversions, the Pd would be ~2.65
PSI.
Pd = 0.5 * 0.002377 slug/ft^3 * 32.2 lbf s^2/ft / slug * 100 ft/s *
100 ft/s / 144 in^2/ft^2 (... told you it was ugly)
I hope that doesn't add more mud to the water.
D
Message 2
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Subject: | Re: Airspeed Sensor Switch |
My bad, Troy...
The correct Pd is exactly what I said it was... provided you divide
the answer by the 32.2 that I inadvertently used. Our good man Willy
understands slugs (his 'uk' email domain gives him away) and steered
you in the right direction. The Pd at 60 knots is just shy of 0.1 psi
(0.08 or so).
Sorry for the bum steer. I should have worked it in SI units to
double check... ;-)
D
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