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Using GPS for TAS.

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p.mulwitz(at)worldnet.att
Guest

Posted: Thu May 11, 2006 9:21 am Post subject: Using GPS for TAS.

Bill,



There are a number of true airspeed calculators on the net which you 

can use to calculate your actual speed.  I found many of them by 

searching with the string "GPS airspeed calculator" on google.



One of the first ones found was 

http://www.csgnetwork.com/tasgpscalc.html which looks like it might 

be helpful.  Most of the good ones require you fly three legs with 90 

degree turns and record the indicated airspeed for both your steam 

gauge and GPS.  The calculators solve the geometry and tell you what 

the wind was and your actual true airspeed.



Good luck,



Paul

XL wings

 	  Quote: 	
		  Regarding the speeds.. I will be using the WAAS-capable GPS to get a

handle on ASI accuracy.. On first flight with about 5 kts wind on the

ground, on an upwind leg I held 75mph on the ASI and saw 62mph ground

speed on the GPS at 1300' AGL.. And on the second flight with

10-15kts on the ground, on a downwind leg, I held 75mph on the ASI

and saw 89mph ground speed on the GPS also at 1300'.  I need to do

some work to get a better handle on the ASI..


	


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steerr(at)bellsouth.net
Guest

Posted: Thu May 11, 2006 12:55 pm Post subject: Using GPS for TAS.

I have one here that I pulled down off the net.  As I recall, somebody's son 

write it.  It's a web page, with the calculations done in JavaScript, so 

it's easy to run in just about any browser.  Let me know if you want it.



Bill



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