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Carl
Joined: 04 May 2007
Posts: 44
Location: Aiken, SC
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 Posted: Thu Sep 06, 2007 6:33 am Post subject: Heated Pitot |
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I’m installing a heated Gretz pitot tube, and wondered about the best mounting location. My plan was to mount it close to where Van shows it in the plans, but the simple tube version goes into the spar flange and the Gretz has a post mount. Help or better yet a picture of an operation unit would be greatly appreciated. Carl
[quote][b]
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Carl Bell
Building N947CB
RV 7A |
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n616tb(at)btsapps.com
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| Posted: Thu Sep 06, 2007 7:00 am Post subject: Heated Pitot |
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Carl,
I don’t think I have any pictures already but I installed that same pitot and it is right where the stock position is for an RV-6. I suspect it is just slightly back in order to allow the mounting bracket for the post to go. You can go back all you need because the pitot end will actually be forward of the stock tube anyway. Just move it back enough to mount the bracket as needed.
I am flying and my airspeed is as expected.
Tim
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Carl Bell
Sent: Thursday, September 06, 2007 9:29 AM
To: rv-list(at)matronics.com
Subject: Heated Pitot
I’m installing a heated Gretz pitot tube, and wondered about the best mounting location. My plan was to mount it close to where Van shows it in the plans, but the simple tube version goes into the spar flange and the Gretz has a post mount. Help or better yet a picture of an operation unit would be greatly appreciated. Carl
| Quote: | | http://www.matronics.com/Navigator?RV-List |
01234
[quote][b]
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Bret Smith
Joined: 09 Jan 2006
Posts: 178
Location: Mineral Bluff, GA
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| Posted: Thu Sep 06, 2007 9:00 am Post subject: Heated Pitot |
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Carl, here is where I am installing the pitot on my RV-9...
http://www.flightinnovations.com/misc.html (Scroll down to the pitot section)
Bret Smith
RV-9A "Fuselage"
Blue Ridge, GA
www.FlightInnovations.com
[quote] ---
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Bret Smith
RV-9A (Emp) |
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khorton01(at)rogers.com
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| Posted: Thu Sep 06, 2007 10:03 am Post subject: Heated Pitot |
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On 6 Sep 2007, at 10:28, Carl Bell wrote:
| Quote: | I’m installing a heated Gretz pitot tube, and wondered about the
best mounting location. My plan was to mount it close to where Van
shows it in the plans, but the simple tube version goes into the
spar flange and the Gretz has a post mount. Help or better yet a
picture of an operation unit would be greatly appreciated. Carl
|
I followed the instructions that came with the Gretz pitot tube
mount, except I moved it one bay outboard.
http://www.kilohotel.com/rv8/article.php?story 021026180308727
You have to work really, really hard if you want to screw up a pitot
source. The laws of physics work in our favour, unlike the situation
with static sources. A pitot source will be accurate as long as the
pitot tube is far enough away from the skin to be clear of the
boundary layer, it is not in the prop wash, not in the wake of
something else, it is pointed roughly into the local airflow, and
there are no leaks. Wind tunnel data shows that a pitot source will
be quite accurate as long as it is aligned within about 15 degrees of
the direction of the local airflow.
Leaks close to the entrance of the pitot tube are much less critical
than leaks further down stream, as any air that leaks out is replaced
by air that comes in the pitot tube. The error from a leak is due to
the pressure loss required to push the leaking air from the tube
entrance to the leak location. Thus small leaks very close to the
pitot tube entrance have neglible effect on the accuracy, which is
why it is OK to have very small drain holes in pitot tubes.
Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://www.kilohotel.com/rv8
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Rick Galati
Joined: 10 Jan 2006
Posts: 91
Location: Lake St. Louis MO.
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| Posted: Thu Sep 06, 2007 1:25 pm Post subject: Heated Pitot |
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Carl,
Like many builders, I moved the pitot installation outboard an extra bay to help avoid potential conflict with tie down ropes. The photos should give you a general idea of a typical Gretz installation regardless of where you decide to locate it.
Rick Galati RV-6A "Darla!" Gretz Pitot
RV-8 FWF Gretz Pitot
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Carl
Joined: 04 May 2007
Posts: 44
Location: Aiken, SC
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| Posted: Thu Sep 06, 2007 7:15 pm Post subject: Heated Pitot |
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Rick,
Great pictures, thx.
All, the Gretz came in today, and the instructions are good, I will move it one bay out and RTFM. Thank you all for your help. Carl
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Rick Galati
Sent: Thursday, September 06, 2007 5:24 PM
To: rv-list(at)matronics.com
Subject: RE: Heated Pitot
Carl,
Like many builders, I moved the pitot installation outboard an extra bay to help avoid potential conflict with tie down ropes. The photos should give you a general idea of a typical Gretz installation regardless of where you decide to locate it.
Rick Galati RV-6A "Darla!" Gretz Pitot
RV-8 FWF Gretz Pitot
[quote][b]
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http://www.matronics.com/Navigator?RV-List |
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Carl Bell
Building N947CB
RV 7A |
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