Europa-List Digest Archive

Tue 03/11/08


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     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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    Time: 02:16:20 AM PST US
    From: "D Wysong" <hdwysong@gmail.com>
    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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    Time: 09:08:41 PM PST US
    From: "D Wysong" <hdwysong@gmail.com>
    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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