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ASI's at what speed do they start

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kitfox555(at)sbcglobal.ne
Guest

Posted: Sun Aug 03, 2008 4:33 pm Post subject: ASI's at what speed do they start

I just went out for my first test run today When does the airspeed indicator start indicating ? I have made several runs down the runway got the tail off the ground, all went well, but I have no airspeed on the ASI , when I blow on it, gently I get 30 - 50 -70 Indicated so I feel that it works. When does it start indicating? I just don't feel comfortable going for that first take off with out a ASI working.  Anyone know about this or have suggestions?  Thanks Jerry



Jerry Evans 

96% done 582

  Magalia Calif.

  N582'er'

  kitfox 555

 [quote][b]

larry huntley

Joined: 19 Jul 2008
Posts: 149

Posted: Sun Aug 03, 2008 5:01 pm Post subject: ASI's at what speed do they start

Right around 40,where you don't want to be if you  want to stay on the ground.    Larry

 [quote]   ---

_________________
Larry Huntley,Dundee,NY
Kitfox 4-1200 N234EE
EA81,AMAX Redrive Warp 3 blade

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Sun Aug 03, 2008 5:40 pm Post subject: ASI's at what speed do they start

Mine starts at 20mph, the lowest number on the scale.



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200

Status: flying w/557+ hrs





On Aug 3, 2008, at 8:57 PM, Larry Huntley wrote:



[quote] Right around 40,where you don't want to be if you want to stay on  

 the ground.    Larry

 ---

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

thesupe(at)hotmail.com
Guest

Posted: Sun Aug 03, 2008 6:52 pm Post subject: ASI's at what speed do they start

There was an article in Kitplanes (I think) a couple of years ago on how to test an ASI with a water column.  A certain number of inches of water preasure should cause the ASI to read a certain amount.  When I check my ASI C I hook a long 1/4" plastic line to the pitot tube and pinch off and then fold the tube up.  That will presureize the ASI gently and the speed goes up about 10 or 20 MPH with each fold.  The long line lets me watch the ASI as I'm doing it.  I don't like the idea of no ASI on takeoff either.  Jim Chuk C  Kitfox 4 building C  Avid MK IV flying C  Mn



Date: Sun C 3 Aug 2008 17:29:22 -0700From: kitfox555(at)sbcglobal.netSubject: ASI's at what speed do they startTo: kitfox-list(at)matronics.comI just went out for my first test run today When does the airspeed indicator start indicating ? I have made several runs down the runway got the tail off the ground C all went well C but I have no airspeed on the ASI  C when I blow on it C gently I get 30 - 50 -70 Indicated so I feel that it works. When does it start indicating? I just don't feel comfortable going for that first take off with out a ASI working.  Anyone know about this or have suggestions?  Thanks Jerry

Jerry Evans 96% done 582

Magalia Calif.

N582'er'

kitfox 555



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gary.algate(at)sandvik.co
Guest

Posted: Sun Aug 03, 2008 8:06 pm Post subject: ASI's at what speed do they start

Mine starts at 20 also which is normally well before the tail comes up 

 

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I just went out for my first test run today When does the airspeed indicator start indicating ? I have made several runs down the runway got the tail off the ground, all went well, but I have no airspeed on the ASI , when I blow on it, gently I get 30 - 50 -70 Indicated so I feel that it works. When does it start indicating? I just don't feel comfortable going for that first take off with out a ASI working.  Anyone know about this or have suggestions?  Thanks Jerry

  

Jerry Evans 

 96% done 582 

Magalia Calif. 

N582'er' 

kitfox 555 



 

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 [quote][b]

thesupe(at)hotmail.com
Guest

Posted: Sun Aug 03, 2008 8:13 pm Post subject: ASI's at what speed do they start

I just googled   testing an airspeed indicator  and the second site listed describes how to test the ASI like the kitplanes article did.  Jim Chuk  

  From: thesupe(at)hotmail.com

To: kitfox-list(at)matronics.com

Subject: RE: ASI's at what speed do they start

Date: Mon C 4 Aug 2008 02:48:03 +0000

   .ExternalClass .EC_hmmessage P {padding:0px;} .ExternalClass body.EC_hmmessage {font-size:10pt;font-family:Tahoma;}  There was an article in Kitplanes (I think) a couple of years ago on how to test an ASI with a water column.  A certain number of inches of water preasure should cause the ASI to read a certain amount.  When I check my ASI C I hook a long 1/4" plastic line to the pitot tube and pinch off and then fold the tube up.  That will presureize the ASI gently and the speed goes up about 10 or 20 MPH with each fold.  The long line lets me watch the ASI as I'm doing it.  I don't like the idea of no ASI on takeoff either.  Jim Chuk C  Kitfox 4 building C  Avid MK IV flying C  Mn

  Date: Sun C 3 Aug 2008 17:29:22 -0700

From: kitfox555(at)sbcglobal.net

Subject: ASI's at what speed do they start

To: kitfox-list(at)matronics.com

I just went out for my first test run today When does the airspeed indicator start indicating ? I have made several runs down the runway got the tail off the ground C all went well C but I have no airspeed on the ASI  C when I blow on it C gently I get 30 - 50 -70 Indicated so I feel that it works. When does it start indicating? I just don't feel comfortable going for that first take off with out a ASI working.  Anyone know about this or have suggestions?  Thanks Jerry

 Jerry Evans 

96% done 582

 Magalia Calif.

 N582'er'

 kitfox 555

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 target=_blank>http://www.matronics.com/Navigator?Kitfox-List

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lcfitt(at)sbcglobal.net
Guest

Posted: Mon Aug 04, 2008 6:30 am Post subject: ASI's at what speed do they start

I made up a spreadsheet for calibratintg the ASI - attached.  The numbers on

the spreadsheet are from my old Model IV.  You can see by checking the

numbers that my ASI was spot on somewhere between 75 and 80 mph and gave

relative bragging rights near stall and at cruise settings.



Lowell



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Airspeed_calculator.xls

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lcfitt(at)sbcglobal.net
Guest

Posted: Mon Aug 04, 2008 11:10 am Post subject: ASI's at what speed do they start

I am trying this again.  The data input (delta inches was protected in the 

file I sent).  If you want to use this spreadsheet, do the measurements and 

then plug them into the spreadsheet and you will get the theoretical 

airspeed based on the pitot tube pressure.  A manometer is easy to make 

using transparent tubing and an eyedropper.  Form a close loop and attach 

one end to the pitot tube.



Lowell



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Airspeed_calculator.xls

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Airspeed_calculator.xls

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Guy Buchanan

Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA

Posted: Mon Aug 04, 2008 11:33 am Post subject: ASI's at what speed do they start

At 05:29 PM 8/3/2008, you wrote:

 	  Quote: 	
		  When does the airspeed indicator start indicating ?


	


         At whatever lowest speed is on the dial. Mine starts at 20, 

and yes I've had it indicate at rest. If you don't have an avionics 

tech friend, pull the ASI and take it for a ride in your car. (Make 

sure the static is routed to the car interior.) However, it sounds 

like you've got a big leak in the pitot side. (The blow test is not 

very useful. It's very easy to get big numbers blowing on a pitot.) 

Let me know if you want some simplified testing methods.

Guy Buchanan

San Diego, CA

K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.

_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too.

rutinker(at)comcast.net
Guest

Posted: Mon Aug 04, 2008 8:06 pm Post subject: ASI's at what speed do they start

Hi Jerry:  The Paradise EAA Chapter 735 has an  manometer for checking ASI's and leaks in the tubing to the ASI.  Right now  it is in the back of my hanger at the Paradise Airport.  You are welcome to  use it anytime.

  

 Rupert Tinker

 Kitfox II, 582, still under  construction

 Paradise, CA

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