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Pitot Static Ports

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Paul A. Franz, P.E.

Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA

Posted: Tue Feb 09, 2010 5:31 am Post subject: Pitot Static Ports

On Tue, February 9, 2010 2:55 am, Mark Napier (napierm) wrote:

 	  Quote: 	
		   



 <http://www.scandinavian-kitfoxes.se/technical/kitfox-doc/Static-system.pdf>



 Time: 04:12:30 PM PST US

 Subject: Re: Kitfox-List Digest: Static port location

 From: "WurlyBird" <james.t.trizzino(at)us.army.mil>



 So why not just post it right here?


	


If you're like me and read the frequent problems with the above Skystar designed

static port mostly because of location, why not use a well designed static port. But

first, before I show you a couple, have a look at how these thing work.



<http://en.wikipedia.org/wiki/Pitot_tube>



The sensors are made as either static only, total pressure only or combined static and

total pressure. From what I see in the above Kitfox instructions is they use a total

pressure sensor in the left wing and a dual port static sensor in the rear part of the

fuselage. If you are satisfied with the total pressure sensor then you might want to

get a fabricated static sensor such as Type PS shown here:



<http://www.unitedsensorcorp.com/pitot.html>



I am going to use a combined static and total pressure sensor more like the Type PA

shown in the above URL. The discussion of errors is worth reading and understanding so

you are aware of error produced by pitch and yaw, especially.



Here are some useful discussion items related to the errors in measurement due to

where the static sensor holes are placed in the tube.



<http://www.flowkinetics.com/measurement.htm>



Given this information, maybe this will contribute to building a better mousetrap, so

to speak. At least your understanding level of the sensig problem should be improved.



As you can see, due to especially boundary layer effects, the SS design falls short.

However it probably can be lauded for simplicity and low drag.

-- 

Paul A. Franz

Registration/Aircraft - N14UW/Merlin GT

Engine/Prop - Rotax 914/NSI CAP

Bellevue WA



"How did it happen? How did our national government grow from a servant

with sharply limited powers into a master with virtually unlimited power?

In part, we were swindled. There are occasions when we have elevated men

and political parties to power that promised to restore limited government

and then proceeded, after their election, to expand the activities of

government. But let us be honest with ourselves. Broken promises are not

the major causes of our trouble. Kept promises are. All too often we have

put men in office who have suggested spending a little more on this, a

little more on that, who have proposed a new welfare program, who have

thought of another variety of 'security.' We have taken the bait,

preferring to put off to another day the recapture of freedom and the

restoration of our constitutional system. We have gone the way of many a

democratic society that has lost its freedom by persuading itself that if

'the people' rule, all is well."

-- Barry Goldwater (1909-1998), former Arizona U.S. Senator



The safety of the republic being the supreme law, and Texas having

offered us the key to the safety of our country from all foreign

intrigues and diplomacy, I say accept the key... and bolt the door

at once.

-- Andrew Jackson



"A free people [claim] their rights as derived from the laws of nature,

and not as the gift of their chief magistrate."

-- Thomas Jefferson, Rights of British America, 1774

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_________________
Paul A. Franz, P.E.
Registration/Aircraft - N14UW/Merlin GT
Engine/Prop - Rotax 914/NSI CAP
Bellevue WA
425.241.1618 Cell
425.440.9505 Office

Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Tue Feb 09, 2010 2:33 pm Post subject: Pitot Static Ports

Many other aircraft use the static port on the side of the fuselage.  There

was even a jet in south America that crashed because the static ports, which

are also connected to the altimeter and VSI, were covered with tape for

painting on the pilot side.  As both systems in the jet were separate there

was a discontinuity between the pilot and co-pilot instruments...  They

stalled in the dark.  Oh yes on a jet the same probes are used it's just

they are connected to a flight computer that drives the panel instruments.



Noel





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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

WurlyBird

Joined: 16 May 2008
Posts: 207
Location: North Pole, Alaska

Posted: Wed Feb 10, 2010 6:51 pm Post subject: Re: Pitot Static Ports

If ANYONE, EVER, crashed a Kitfox or similar aircraft due to an instrument failure they probably needed to be removed from the aviation gene pool anyway.  The only instruments I rely on are the RPM and TGT.  Every other instrument in the aircraft is only used to reinforce what the pilot should have already felt.

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_________________
James
Kitfox 3 / 582 / 70" IVO 2 blade GA
50 hrs on the 582 swapping for HKS 700E and Avid Cowl.

Fox5flyer
Guest

Posted: Thu Feb 11, 2010 3:48 am Post subject: Pitot Static Ports

Interesting contribution.   Would have been more useful with some meaningful 

information about building a Kitfox.

Deke

---

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