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Speed test today

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rene(at)felker.com
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Posted: Sun Sep 14, 2008 5:55 pm Post subject: Speed test today

Got up today and ran a simple 4 course speed test.  The GPS speed in the spreadsheet is GPS Ground Speed.  Looks like 175.5 Knots….average.  

   

Looks like my indicated air speed may be a little low……  

   

Any inputs?  

     

Rene'  

N423CF Flying  

801-721-6080

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Speed_Test_14_Sep_08.xls

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Tim Olson

Joined: 25 Jan 2007
Posts: 2881

Posted: Sun Sep 14, 2008 6:27 pm Post subject: Speed test today

Rene,



Awesome that you went out and did a couple of official runs!

I plugged the numbers into Kevin Horton's speed spreadsheet,

the 4-way version, here:

http://go.phpwebhosting.com/~khorton/rv8/phplinks/index.php?&PID=49



I get 175.6 for both runs.



That just means that you maybe have 3.5 kts of error and when you

report speed you will have to accommodate that.  I am sure with a

little playing you could improve the accuracy a small amount...maybe

even try taking some aluminum tape and taping over your static

ports with a nice clean circle sticker with a hole in the center, and

by raising them you may get more accuracy....but at 3.5kts error

I don't know that I'd invest a ton of time in it.



Thanks also for adding all of the other data points in the

spreadsheet too...that's the way to do it...record it all.  From

this I can look and get the idea of the conditions.



Of course, to get max speed out of it, you'd fly a little lower,

firewall the throttle and raise the RPM, and push that fuel flow

up there a ways.   But, most people will realize that the numbers

you posted are just a good ROP higher-speed cruise number that

you may get going x/c somewhere when you're not looking for

max range.



Very nice to see someone investing the time to ensure they know

the accuracy of their systems.  Good job!



Tim Olson - RV-10 N104CD - Flying



Rene wrote:

 	  Quote: 	
		   Got up today and ran a simple 4 course speed test.  The GPS speed in the 

 spreadsheet is GPS Ground Speed.  Looks like 175.5 Knots….average.

 

  

 

 Looks like my indicated air speed may be a little low……

 

  

 

 Any inputs?

 

  

 

 Rene'

 

 N423CF Flying

 

 801-721-6080

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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