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flyguy(at)surewest.net
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 Posted: Sun Nov 09, 2008 12:57 pm Post subject: pitot static line |
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Can anyone tell me what they’re doing with the altitude encoder static line on their Zodiac? ZAC says a static tube is not necessary since cabin pressure is the same as outside however, will the encoder report correctly if you don’t hook it up to a static line/port? Also, if you’re not using a static port, are you just leaving the hole(s) empty in the back of the appropriate instruments or are you running a brief tube that either connects the instruments or simply left open within/under the panel? Thanks for any help you might provide!
[quote][b]
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z601(at)anemicaardvark.co
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| Posted: Sun Nov 09, 2008 1:21 pm Post subject: pitot static line |
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On Sunday 09 November 2008 14:56, TOM wrote:
| Quote: | Can anyone tell me what they're doing with the altitude encoder static line
on their Zodiac? ZAC says a static tube is not necessary since cabin
pressure is the same as outside however, will the encoder report correctly
if you don't hook it up to a static line/port? Also, if you're not using a
static port, are you just leaving the hole(s) empty in the back of the
appropriate instruments or are you running a brief tube that either
connects the instruments or simply left open within/under the panel? Thanks
for any help you might provide!
|
I don't have a Zenith built, so I don't have anything that would give me a
definite measurement. However, I was told many years ago that the pressure
inside a closed aircraft cabin is slightly lower than the pressure outside.
If this is true, using the air pressure inside the aircraft would give you
slightly higher altitude readings.
Having said this, on page 6 W 9 of the drawings Zenith provided, there appears
to be both a static and a dynamic pitot tube installed in the wing. Do your
drawings differ?
--
==============================================
Those who can, do. Those who can't, sue.
=================================================
Jim B. Belcher
BS, MS Physics, math, Computer Science
A&P/IA
Instrument Rated Pilot
General Radio Telephone Certificate
=================================================
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psm(at)att.net
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| Posted: Sun Nov 09, 2008 1:23 pm Post subject: pitot static line |
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Hi Tom,
I am getting altitude information from my Dynon EFIS to the transponder, so I don't have your exact issue. But, as usual, I do have a comment or two . . .
It is true the cabin pressure will be nearly the same as static instrument pressure, but there will be some differences - particularly a lag when you change altitude. It probably doesn't make much difference to ATC whether you report your altitude accurately or not since everyone uses non-sensitive pressure altitude for this purpose. Still, if you can hook up your static pressure to your blind encoder it certainly won't hurt anything.
Paul
XL getting close
At 12:56 PM 11/9/2008, you wrote:
[quote]Can anyone tell me what they’re doing with the altitude encoder static line on their Zodiac? ZAC says a static tube is not necessary since cabin pressure is the same as outside however, will the encoder report correctly if you don’t hook it up to a static line/port? Also, if you’re not using a static port, are you just leaving the hole(s) empty in the back of the appropriate instruments or are you running a brief tube that either connects the instruments or simply left open within/under the panel? Thanks for any help you might provide![b]
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jetboy
Joined: 22 Jul 2006
Posts: 233
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| Posted: Sun Nov 09, 2008 3:00 pm Post subject: Re: pitot static line |
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For both mt CH701 and Cessna150A there was considerable airspeed error and minor altitude error without a proper static port. This is fine for marketing purposes adding 15% to the cruise speed. Usual practice when not connecting a static port is to plumb all the instrument static lines together and fit a plug with small holes or cotton wool filter to the end of the line. The cost of a dual pitot/static probe or the static ports is so small its better to use them. Once you have them in an aircraft its easy to pull the line inflight and verify the errors. Perhaps someone with your model could chip in here with real results
Ralph
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Tue Nov 11, 2008 7:27 am Post subject: Re: pitot static line |
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Internal and external static pressure CAN vary widely in an aircraft. I've pulled the alternate static port control in a plane and seen a 500 ft change in altitude. I've also done it in a plane where the change was barely noticeable. What it will do in a Zenith I can't say. Plumbing in a splitter on your static port line for the encoder should be neither time consuming or expensive. If I wasn't getting my encoder data from my Dynon I would.
| flyguy(at)surewest.net wrote: | Can anyone tell me what they’re doing with the altitude encoder static line on their Zodiac? ZAC says a static tube is not necessary since cabin pressure is the same as outside however, will the encoder report correctly if you don’t hook it up to a static line/port? Also, if you’re not using a static port, are you just leaving the hole(s) empty in the back of the appropriate instruments or are you running a brief tube that either connects the instruments or simply left open within/under the panel? Thanks for any help you might provide!
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W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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