Pitot and static system water traps

Submitted by Anonymous on

Forums: 

From: Stevens Family <stevens5 [at] swiftdsl.com.au>
Sender: <marv [at] lancaironline.net>
Subject: Pitot and static system water traps
Date: Thu, 21 Aug 2014 12:10:44 -0400
To: <lml [at] lancaironline.net>

Another question for the list!

 

The builders’ manual suggests putting a water trap in the static system, but gives no details of what, where or how this should be done. The only reference I have found so far is on the ACS website

 

( http://www.aircraftspruce.com/catalog/inpages/pitotstatic.php?clickkey=1683975 ).

 

My question to all of you who are already flying, is …

1.       How important is it to have a water trap in the static system?

2.       If you have balanced static ports Tee’d into one line through to the panel, is one required for each port, or should there be just one for the whole static system?

3.       Is it best to use the commercially available trap, or is there a simpler way of doing it?

4.       Should there be a similar system in the pitot line?

 

Thanks in anticipation.

 

Rob Stevens

Perth,

Western Australia.

 

Pitot and static system water traps

Submitted by Anonymous on

From: Steve Richard <steve [at] oasissolutions.com>
Sender: <marv [at] lancaironline.net>
Subject: RE: [LML] Pitot and static system water traps
Date: Thu, 21 Aug 2014 13:13:34 -0400
To: <lml [at] lancaironline.net>
Message Header


Undecoded Message

“Water trap” for ES based on “KISS” principle.  On both sides of the fuselage.  Your pitot tube should have its own water drain built-in to the tube (if you are using a standard pitot tube).  I don’t wash the
plane with any pressure system or hose.  One could also build a trap out of plastic fittings and tubing.

 

 

From: Lancair Mailing List [lml [at] lancaironline.net]">mailto:lml [at] lancaironline.net]
On Behalf Of Stevens Family

Sent: Thursday, August 21, 2014 9:11 AM

To: Lancair Mailing List

Subject: [LML] Pitot and static system water traps

 

Another question for the list!

 

The builders’ manual suggests putting a water trap in the static system, but gives no details of what, where or how this should be done. The only reference I have found so far is on the ACS website

 

(
http://www.aircraftspruce.com/catalog/inpages/pitotstatic.php?clickkey=1683975 ).

 

My question to all of you who are already flying, is …

1.      
How important is it to have a water trap in the static system?

2.      
If you have balanced static ports Tee’d into one line through to the panel, is one required for each port, or should there be just one for the whole static system?

3.      
Is it best to use the commercially available trap, or is there a simpler way of doing it?

4.      
Should there be a similar system in the pitot line?

 

Thanks in anticipation.

 

Rob Stevens

Perth,

Western Australia.

 


Image


image003.jpg

pitot and static system water traps

Submitted by Anonymous on

From: Bill Harrelson <n5zq [at] verizon.net>
Sender: <marv [at] lancaironline.net>
Subject: pitot and static system water traps
Date: Thu, 21 Aug 2014 13:14:17 -0400
To: <lml [at] lancaironline.net>
Message Header


Undecoded Message
Rob,
 
I put two of these static traps in the
IV. Even though the airplane has flown through heavy rain and spent a few nights
outside in hard blowing rain, I ain’t never seen nuthin in ‘em.  I believe
that if your lines exit the static ports upward for several inches you’ll
decrease the possibility of water accumulation by a great deal.
 
In the 320 I put no traps, just exited
the ports upward and never had any water in 2300 hrs. If you are going to use a
trap, I’m sure that anything you can come up with will work as well as the
commercial trap. If you do use a trap, put it as close to the static port as
practical. The amount of water you will catch, if any, will be measured by the
milliliter, not by the gallon.
 
Most commercial pitot tubes have a built in drain so it should not be
necessary in the pitot system.
 
Bill Harrelson
N6ZQ IV  575 hrs
 

Pitot and static system water traps

Submitted by Anonymous on

From: Charles Brown <browncc1 [at] verizon.net>
Sender: <marv [at] lancaironline.net>
Subject: Re:Pitot and static system water traps
Date: Fri, 22 Aug 2014 07:09:52 -0400
To: <lml [at] lancaironline.net>
Message Header


Undecoded Message

Rob, if you're going to descend through rain, you need the static lines to go uphill at first as others have shown in pictures.  Here's an example (my airplane) of *insufficient* bend:  Although it looks about like the graphic in the Legacy manual, my system does occasionally collect water.  As a result, the sensed altitude gets notchy as enough static pressure has to build up to shove the water out of the way and burp an air bubble past it.  Then there's a 100-foot jump in sensed altitude.  No big deal in most conditions, but no good for precision approaches, and also causes the pitch autopilot to osciilate slightly.  It's simple to blow it out with compressed air, but obviously something to avoid entirely by good design.


Charley Brown
Legacy





From: "Stevens Family" <stevens5 [at] swiftdsl.com.au

>
Date: August 21, 2014 11:10:44 AM CDT
Subject: Pitot and static system water traps



My question to all of you who are already flying, is …

1.       How important is it to have a water trap in the static system?

2.       If you have balanced static ports Tee’d into one line through to the panel, is one required for each port, or should there be just one for the whole static system?

3.       Is it best to use the commercially available trap, or is there a simpler way of doing it?

4.       Should there be a similar system in the pitot line?

 



Image


PastedGraphic-1.png

Pitot and static system water traps

Submitted by Anonymous on

From: Stevens Family <stevens5 [at] swiftdsl.com.au>
Sender: <marv [at] lancaironline.net>
Subject: RE: [LML] Re: Pitot and static system water traps
Date: Fri, 22 Aug 2014 09:44:22 -0400
To: <lml [at] lancaironline.net>
Message Header


Undecoded Message

Steve, Bill and Charley,

 

Thanks guys for your responses. Lots of good information. I think I’ll go on the KISS principle, and just make sure I put a decent upward line from the ports and then “T” both lines into one.

 

I really appreciate your support.

 

Rob.

 

 

From: Lancair Mailing List [lml [at] lancaironline.net]">mailto:lml [at] lancaironline.net] On Behalf Of Charles Brown
Sent: Friday, 22 August 2014 7:10 PM
To: Lancair Mailing List
Subject: [LML] Re: Pitot and static system water traps

 

Rob, if you're going to descend through rain, you need the static lines to go uphill at first as others have shown in pictures.  Here's an example (my airplane) of *insufficient* bend:  Although it looks about like the graphic in the Legacy manual, my system does occasionally collect water.  As a result, the sensed altitude gets notchy as enough static pressure has to build up to shove the water out of the way and burp an air bubble past it.  Then there's a 100-foot jump in sensed altitude.  No big deal in most conditions, but no good for precision approaches, and also causes the pitch autopilot to osciilate slightly.  It's simple to blow it out with compressed air, but obviously something to avoid entirely by good design.

 

Charley Brown

Legacy

 

 

 

From: "Stevens Family" <stevens5 [at] swiftdsl.com.au

>

Date: August 21, 2014 11:10:44 AM CDT

Subject: Pitot and static system water traps




My question to all of you who are already flying, is …

1.       How important is it to have a water trap in the static system?

2.       If you have balanced static ports Tee’d into one line through to the panel, is one required for each port, or should there be just one for the whole static system?

3.       Is it best to use the commercially available trap, or is there a simpler way of doing it?

4.       Should there be a similar system in the pitot line?

 

 


Image


image001.jpg

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