Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Speed test today

Matronics Email Lists Forum Index -> RV10-List

View previous topic :: View next topic

Author Message

rene(at)felker.com
Guest

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

- 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:

http://www.matronics.com/Navigator?RV10-List

Speed_Test_14_Sep_08.xls

Description:

Download

Filename:

Speed_Test_14_Sep_08.xls

Filesize:

18 KB

Downloaded:

210 Time(s)

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:

http://www.matronics.com/Navigator?RV10-List

Display posts from previous:

	Matronics Email Lists Forum Index -> RV10-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum