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VM1000 manifold pressure and CHT sensors - a formula

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sarg314(at)comcast.net
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Posted: Sun Sep 09, 2007 6:00 pm Post subject: VM1000 manifold pressure and CHT sensors - a formula

I found an absolute air pressure calculator at the link below.



http://www.csgnetwork.com/barcorrectthcalc.html



When I fill in the numbers it gives me a 2.02 in. hg correction, so I 

have a 0.7 in. error, not a 2.7 in error. 



--

Tom S.

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khorton01(at)rogers.com
Guest

Posted: Mon Sep 10, 2007 2:05 am Post subject: VM1000 manifold pressure and CHT sensors - a formula

On 9 Sep 2007, at 22:00, sarg314 wrote:



 	  Quote: 	
		   



 I found an absolute air pressure calculator at the link below.



 http://www.csgnetwork.com/barcorrectthcalc.html



 When I fill in the numbers it gives me a 2.02 in. hg correction, so  

 I have a 0.7 in. error, not a 2.7 in error.


	


I'm not sure this calculator does what you think it does.  It seems  

to calculate the sea level referenced barometric pressure, which is a  

number that the meteorologists like, as it removes the effect of  

elevation on the pressures they are analysing.



Look at the standard atmosphere calculator at:



http://www.digitaldutch.com/atmoscalc/



It will show you the pressure that would be present at 2200 ft  

elevation, assuming you had a standard atmosphere.



If you want to correct for non-standard pressures, and you have  

access to an altimeter setting from a local airport, look at:



http://wahiduddin.net/calc/calc_da.htm



It is really designed to calculate density altitude, so it won't run  

unless you also input temperature and dew point.  But, it also  

displays absolute pressure, which is what your MP gauge is  

reporting.  The absolute pressure calculation is not affected by  

temperature or dew point, so you can input any values for those  

parametres.



Kevin

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sarg314(at)comcast.net
Guest

Posted: Mon Sep 10, 2007 6:31 pm Post subject: VM1000 manifold pressure and CHT sensors - a formula

Kevin:

    The DigitalDutch link seems to give results for a standard 

atmosphere though - it takes no baro input.    It's computing for 29.92 

inches Hg.  The second link (wahiduddin, where'd they get THAT name?) is 

just what I need. Thanks very much.



Kevin Horton wrote:



 	  Quote: 	
		  

 I'm not sure this calculator does what you think it does.  It seems  

 to calculate the sea level referenced barometric pressure, which is a  

 number that the meteorologists like, as it removes the effect of  

 elevation on the pressures they are analysing.



 Look at the standard atmosphere calculator at:



 http://www.digitaldutch.com/atmoscalc/



 It will show you the pressure that would be present at 2200 ft  

 elevation, assuming you had a standard atmosphere.



 If you want to correct for non-standard pressures, and you have  

 access to an altimeter setting from a local airport, look at:



 http://wahiduddin.net/calc/calc_da.htm

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