---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Tue 03/11/08: 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 _____________________________________ Time: 02:16:20 AM PST US From: "D Wysong" Subject: Europa-List: 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 _____________________________________ Time: 09:08:41 PM PST US From: "D Wysong" Subject: Europa-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.