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static and pitot wing connectors

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frans(at)paardnatuurlijk.
Guest

Posted: Thu Oct 22, 2009 1:58 am Post subject: static and pitot wing connectors

Hi everyone,



I thought to be smart and ordered from RS the "upgraded" versions of the

standard Europa static and pitot connectors. These are not floating but

have a thread and nut so I can fix them on the fuselage. As a bonus (I

thought) they have an automatic valve that closes when they are not

connected, so no moisture or bugs can creep in.

So far so good. The system is leak free (as tested with a syringe to

simulate pressure changes), over a couple of hours indications of ASI

and altitude didn't change.

However, I noticed now that with the wings disconnected, when the

ambient temperature or pressure changes, the instruments start to

indicate airspeed and altitude values, because the pressure inside the

static and pitot system can not vent. Of course the pressure difference

will leak away over a couple of days, but the leak rate of the pitot and

static are not equal so in the mean time weird things happen.

One thing that concerns me is what would happen when the pressure in the

pitot is lower than in the static port: the ASI would want to indicate a

negative value. This will happen when the ambient pressure increases and

the leak rate of the static port is higher than the pitot.

Should I abandon the idea of using the connectors with automatic valves?

Or should I intentionally introduce a small leak between static and

pitot so ambient pressure changes will not wreck havoc with the

instruments? Has anyone else a similar setup?



Frans

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g-iani(at)ntlworld.com
Guest

Posted: Thu Oct 22, 2009 3:33 am Post subject: static and pitot wing connectors

Frans



I have the self sealing version of these connectors on my fuel lines.  These

are only used to remove the filters for cleaning.



My feeling was that they are something else to fail so I did not use them on

the pitot and static.  I would not want to introduce a controlled leak

between pitot and static.



Ian Rickard G-IANI XS Trigear, 280 hours

Europa Club Mods Rep (Trigear)

e-mail g-iani(at)ntlworld.com

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Thu Oct 22, 2009 5:59 pm Post subject: Re: static and pitot wing connectors

The magnitude of usual weather changes will not harm your instruments.

Bugs in the tubing would be far worse.  You made the right choice.

I near never disco the wings, so I use the Winter 5 hose connector

which is not self-sealing.



Ira

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_________________
Ira N224XS

craigb(at)onthenet.com.au
Guest

Posted: Fri Oct 23, 2009 12:11 am Post subject: static and pitot wing connectors

frans



Maybe you could use the syringe idea, with some fine cloth over the plunger end

to allow the system to "breath" over extended periods on the ground, or put

one of the air control valves used for fish tanks etc, in on a "T" piece, that way

you can open it if desired, just dont forget to close it before flight



craig

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topglock(at)cox.net
Guest

Posted: Fri Oct 23, 2009 6:55 am Post subject: static and pitot wing connectors

IF one has installed opposite connectors to the tubes, just plug them 

together.  Serves the same purpose...



Jeff - Baby Blue



rampil wrote:

 	  Quote: 	
		   

 

 The magnitude of usual weather changes will not harm your instruments.

 Bugs in the tubing would be far worse.  You made the right choice.

 I near never disco the wings, so I use the Winter 5 hose connector

 which is not self-sealing.

 

 Ira

 

 --------

 Ira N224XS

 

 

 

 

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