The reference book I have by C A Williams "Aircraft Instruments" published in 1961 gives:
P = 0.016580 x V squared (1 + 0.57 x V squared x 10 to the power -6) With resulting P in mm of H20 given V input in knots. If you go really fast, ie above 300 knots, a yet more accurate formula is stated. This is better than a simple V squared formula. As Mike Borgelt says temperature is an issue and yet strangely the reference above does not specify the temperature at which the formula is reckoned to be accurate. Cheers Roger Druce -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of J Hudson Sent: Wednesday, 31 January 2007 1:13 PM To: Discussion of issues relating to Soaring in Australia. Subject: Re: [Aus-soaring] Manometer Construction I am seeking info on the manometer scale above 160 Kts for ASI Calibration, up to say 250 Kts. Basic Sailplane Engineering provides the info up to 160 Kts. Ive been unable to locate any info - and the scale to 160 Kts does not appear consistent, let alone to 250 Kts. Thanks in anticipation, John Hudson _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
