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Pitot test rig (was Pitot cover)

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carl.froehlich(at)verizon
Guest

Posted: Sun Jul 05, 2009 8:53 am Post subject: Pitot test rig (was Pitot cover)

Before first flight, or anytime you have a doubt about airspeed indication,

you can do a simple but accurate check.



Photo attached on the pitot test rig I made.  While the one photo is with

the airspeed indicator out of the plane, normal is to attach the tubing

directly to the pitot tube (electrical tape makes a good seal) and test the

entire system for accuracy and leaks.  I used a standard blood pressure bulb

to pump up the water level - it does not take much.  Also attached is the

conversion scale to put under the level tube to read out directly into

knots.  As airspeed is strictly related to differential pressure, there are

no corrections for temperature, atmospheric pressure or altitude.



Carl Froehlich

RV-8A (500 hrs)

RV-10 (fuselage)



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KiloPapa

Joined: 24 May 2006
Posts: 142
Location: Pearblossom, CA

Posted: Sun Jul 05, 2009 6:21 pm Post subject: Pitot test rig (was Pitot cover)

Nice post!



Kevin

40494

tail/empennage



do not archive

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Kevin
40494

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orchidman

Joined: 10 Jul 2006
Posts: 277
Location: Oklahoma City - KRCE

Posted: Mon Jul 06, 2009 3:51 am Post subject: Re: Pitot test rig (was Pitot cover)

I built and used the one from the EZ people at:



http://www.iflyez.com/manometer.shtml

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Gary Blankenbiller
RV10 - # 40674
(N2GB Flying)

Lenny Iszak

Joined: 23 Mar 2008
Posts: 270

Posted: Tue Jul 07, 2009 6:23 pm Post subject: Re: Pitot test rig (was Pitot cover)

I wonder if I could use different type of tubing for the manometer rig. I'd like to use the tubing supplied for the brakes. Would that change the readings?



Lenny

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Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Wed Jul 08, 2009 10:03 am Post subject: Re: Pitot test rig (was Pitot cover)

Only the difference in the heights of the liquid matter, not the diameter of the tubing. And it's vertical height that matters, in case the rig itself is not vertical. The formula is: Pressure equals density (of the liquid) times the acceleration of gravity times the vertical height difference.

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Bob Turner
RV-10 QB

Lenny Iszak

Joined: 23 Mar 2008
Posts: 270

Posted: Wed Jul 08, 2009 10:08 am Post subject: Re: Pitot test rig (was Pitot cover)

Thanks Bob. It helps to know how it works.

I tried it last night using the brake tubing and it worked great.

Needed it to calibrate an electronic pressure sensor.



Lenny

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