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Static Pressure Ports

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cv93436(at)windstream.net
Guest

Posted: Mon Feb 18, 2013 2:29 pm Post subject: Static Pressure Ports

I too have installed Van's  static pressure ports where indicated on the empennage to find out they gave  false pressure readings.  I had my air speed indicator checked, tried  shielding the ports with a cup (like military aircraft), and placing one half of  a 3/8" washer in front of each port as recommended by a subscriber on Van's  Airforce.  Air speed indicator and pitot system checked fine (no  leaks).  I put in an alternate air valve under panel.  Opening the Alt  Air made the air speed indicator jump from 175 mph to 195 mph.  Closing it  made the air speed drop to 175 mph again.  As a result, I disconnected the  T-tube to each port in the tail and it reads correctly now.  I would  propose letting your static source open in the tail with a small vent (so bugs  can't get in it) and not fuss with static ports at all.  Vented in the tail  makes it weather proof also.

   [quote][b]

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jerry-hansen(at)cox.net
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Posted: Mon Feb 18, 2013 4:32 pm Post subject: Static Pressure Ports

Sent from my iPad



On Feb 18, 2013, at 2:29 PM, "Carroll L. Verhage" <cv93436(at)windstream.net (cv93436(at)windstream.net)> wrote:

[quote]            I too have installed Van's  static pressure ports where indicated on the empennage to find out they gave  false pressure readings.  I had my air speed indicator checked, tried  shielding the ports with a cup (like military aircraft), and placing one half of  a 3/8" washer in front of each port as recommended by a subscriber on Van's  Airforce.  Air speed indicator and pitot system checked fine (no  leaks).  I put in an alternate air valve under panel.  Opening the Alt  Air made the air speed indicator jump from 175 mph to 195 mph.  Closing it  made the air speed drop to 175 mph again.  As a result, I disconnected the  T-tube to each port in the tail and it reads correctly now.  I would  propose letting your static source open in the tail with a small vent (so bugs  can't get in it) and not fuss with static ports at all.  Vented in the tail  makes it weather proof also.

    	  Quote: 	
		  

	


[b]

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