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rnothard(at)yahoo.com
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 Posted: Tue Oct 21, 2008 11:52 pm Post subject: Air Speed Indicator |
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Fellow enthusiasts, I have for some time been reading, absorbing and learing from my esteemed colleagues. I am posting a question for the first time. My 701 has an ASI which underreads by approximately 12 knots. Both the Pitot and Static vent are sited 2/3 up the pilot side leading wing strut. I know there was some discussion on how to resolve, but for the life of me cannot find the information, so beggin your patience I wonder if smeone will be kind enough to remind me how to overcome this underread problem. Thanks for your patience
Ric
Make the switch to the world's best email. [url=http://au.rd.yahoo.com/mail/taglines/au/mail/default/*http://au.yahoo.com/y7mail]Get Yahoo!7 Mail[/url]. [quote][b]
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bobkat
Joined: 07 Sep 2008
Posts: 143
Location: Bismarck, ND
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| Posted: Wed Oct 22, 2008 6:39 am Post subject: Air Speed Indicator |
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Hi Ric. I have pretty well the same problem. I have a Dynon 180 EFIS with the dual pitot tube AOA and my airspeed reads about 8 knots slow. My dual static source is on the right and left sides of the fuselage at the front of the cabin. I've tried rezeroing the ASI as per Dynon's instruction but haven't noted any change.
When I'm flying along I get the impression that the pitot tube is not exactly parallell to the horizon, but is a bit "nose up" with reference to the horizon. I've gone over the tubing itself and haven't found any kinked or otherwise obstructed areas.
Wonder if your ASI is a conventional round gauge or a Dynon?
[quote] ---
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lgold(at)quantum-associat
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| Posted: Wed Oct 22, 2008 9:02 am Post subject: Air Speed Indicator |
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Ric,
The problem is with the static line not the pitot. Initially my single static line ended inside the leading edge of the wing at about the same position that you have yours. We both found out that this does not work. I found that my error increased with the angles of attack. It was really upsetting to see a zero airspeed indication just before touch-down when I was shooting STOL landings. I think this occurred because there is an opening under the leading edge of the wing at the forward attachment point that probably scoops up air at high angles of attack that was picked up by the static line.
So... I experimented with the position of the static line, I tried ending it inside the cabin but it still read low. Then I put the endings outside each side of the cabin below the doors (better but still off). Finally I looked at what others has done and moved the two endings about two feet behind the doors just under the baggage compartment outside the cabin. The results now are in sync with the GPS at any airspeed.
Les
[quote] From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of Rick Nothard
Sent: Wednesday, October 22, 2008 12:53 AM
To: zenith701801-list(at)matronics.com
Subject: Air Speed Indicator
Fellow enthusiasts, I have for some time been reading, absorbing and learing from my esteemed colleagues. I am posting a question for the first time. My 701 has an ASI which underreads by approximately 12 knots. Both the Pitot and Static vent are sited 2/3 up the pilot side leading wing strut. I know there was some discussion on how to resolve, but for the life of me cannot find the information, so beggin your patience I wonder if smeone will be kind enough to remind me how to overcome this underread problem. Thanks for your patience
Ric
Make the switch to the world's best email. [url=http://au.rd.yahoo.com/mail/taglines/au/mail/default/*http://au.yahoo.com/y7mail]Get Yahoo!7 Mail[/url]. | Quote: |
href="http://www.matronics.com/Navigator?Zenith701801-List">http://www.matronics.com/Navigator?Zenith701801-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
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[b]
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bobkat
Joined: 07 Sep 2008
Posts: 143
Location: Bismarck, ND
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| Posted: Wed Oct 22, 2008 9:37 am Post subject: Air Speed Indicator |
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Wow, thanks for the info Les! Are those static ports on the bottom or the side of the airplane? I take it the side! What you are describing is exactly what my plane is doing! Thanks
[quote] ---
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ch701builder(at)yahoo.com
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| Posted: Wed Oct 22, 2008 11:52 am Post subject: Air Speed Indicator |
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All,
Here is a couple of pictures I took of 701ZB, when I was out in Quality Sports in Cloverdale, CA.
The pictures show his just a little bit behind the baggage rivet line. Can not remember the gentleman's name, but he did point the static port out to me and said he has good luck with it. He flies with a Flightdeck D-180 (Dynon)
Just FYI
Keith
CH701 -- scratch -- skinning elevator
N 38.9940
W 105.1305
Alt. 9,100'
(5" of snow last night)
****************************************************************************************
From: BokKat <bobkat(at)btinet.net>
To: zenith701801-list(at)matronics.com
Sent: Wednesday, October 22, 2008 11:36:18 AM
Subject: Re: Air Speed Indicator
Wow, thanks for the info Les! Are those static ports on the bottom or the side of the airplane? I take it the side! What you are describing is exactly what my plane is doing! Thanks
[quote] ---
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1036 Time(s) |
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craig(at)craigandjean.com
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| Posted: Wed Oct 22, 2008 12:22 pm Post subject: Air Speed Indicator |
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N701ZB is registered to Andrew Mirek:
Aircraft Description
Serial Number 7-6689 Type Registration
Individual
Manufacturer Name MIREK ANDREW Certificate Issue
Date 11/01/2007
Model STOL CH 701 Status Valid
Type Aircraft Fixed Wing Single-Engine Type Engine
4 Cycle
Pending Number Change None Dealer No
Date Change Authorized None Mode S Code
52255206
MFR Year 2007 Fractional Owner NO
Registered Owner
Name MIREK ANDREW
Street 2628 SANTA CLARA AVE
City ALAMEDA State CALIFORNIA Zip Code
94501-3041
County ALAMEDA
Country UNITED STATES
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ch701builder(at)yahoo.com
Guest
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| Posted: Wed Oct 22, 2008 1:13 pm Post subject: Air Speed Indicator |
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All, did the pictures of the static port location come thru?
I didn't even see my reply come through. This is the first response I saw come back, and I only assumed that, because of the 701ZB register, (thanks Craig)
Keith
CH701 -- scratch
*******************************************************************
From: Craig Payne <craig(at)craigandjean.com>
To: zenith701801-list(at)matronics.com
Sent: Wednesday, October 22, 2008 2:21:55 PM
Subject: RE: Air Speed Indicator
--> Zenith701801-List message posted by: "Craig Payne" <craig(at)craigandjean.com (craig(at)craigandjean.com)>
N701ZB is registered to Andrew Mirek:
Aircraft Description
Serial Number 7-6689 Type Registration
Individual
Manufacturer Name MIREK ANDREW Certificate Issue
Date 11/01/2007
Model STOL CH 701 Status Valid
Type Aircraft Fixed Wing Single-Engine Type Engine
4 Cycle
Pending Number Change None [quote][b]
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craig(at)craigandjean.com
Guest
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| Posted: Wed Oct 22, 2008 1:27 pm Post subject: Air Speed Indicator |
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If you didn’t get them here are links into the web-based forums:
http://forums.matronics.com/viewtopic.php?t=49792
http://forums.matronics.com/download.php?id=12714
http://forums.matronics.com/download.php?id=12715
-- Craig
From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of Keith Ashcraft
Sent: Wednesday, October 22, 2008 3:13 PM
To: zenith701801-list(at)matronics.com
Subject: Re: Air Speed Indicator
All, did the pictures of the static port location come thru?
I didn't even see my reply come through. This is the first response I saw come back, and I only assumed that, because of the 701ZB register, (thanks Craig)
Keith
CH701 -- scratch
*******************************************************************
From: Craig Payne <craig(at)craigandjean.com>
To: zenith701801-list(at)matronics.com
Sent: Wednesday, October 22, 2008 2:21:55 PM
Subject: RE: Air Speed Indicator
--> Zenith701801-List message posted by: "Craig Payne" <craig(at)craigandjean.com (craig(at)craigandjean.com)>
N701ZB is registered to Andrew Mirek:
Aircraft Description
Serial Number 7-6689 Type Registration
Individual
Manufacturer Name MIREK ANDREW Certificate Issue
Date 11/01/2007
Model STOL CH 701 Status Valid
Type Aircraft Fixed Wing Single-Engine Type Engine
4 Cycle
Pending Number Change None | Quote: | | http://www.matronics.com/Navigator?Zenith701801-List |
0123456789
[quote][b]
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raymondj(at)frontiernet.n
Guest
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| Posted: Wed Oct 22, 2008 1:37 pm Post subject: Air Speed Indicator |
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I got them.
Raymond Julian
Kettle River, MN
"Hope for the best,
but prepare for the worst."
do not archive
---
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ch701builder(at)yahoo.com
Guest
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| Posted: Wed Oct 22, 2008 2:47 pm Post subject: Air Speed Indicator |
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Yes sir, I found them. I received my 2nd post before I received my 1st post.
Anyway, Hope this helps out with the static source locations.
Keith
(do not archive)
***************************************************************************
From: Craig Payne <craig(at)craigandjean.com>
To: zenith701801-list(at)matronics.com
Sent: Wednesday, October 22, 2008 3:26:36 PM
Subject: RE: Air Speed Indicator
If you didnąt get them here are links into the web-based forums:
http://forums.matronics.com/viewtopic.php?t=49792
http://forums.matronics.com/download.php?id=12714
http://forums.matronics.com/download.php?id=12715
-- Craig
From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of Keith Ashcraft
Sent: Wednesday, October 22, 2008 3:13 PM
To: zenith701801-list(at)matronics.com
Subject: Re: Air Speed Indicator
All, did the pictures of the static port location come thru?
I didn't even see my reply come through. This is the first response I saw come back, and I only assumed that, because of the 701ZB register, (thanks Craig)
Keith
CH701 -- scratch
*******************************************************************
From: Craig Payne <craig(at)craigandjean.com>
To: zenith701801-list(at)matronics.com
Sent: Wednesday, October 22, 2008 2:21:55 PM
Subject: RE: Air Speed Indicator
--> Zenith701801-List message posted by: "Craig Payne" <craig(at)craigandjean.com (craig(at)craigandjean.com)>
N701ZB is registered to Andrew Mirek:
Aircraft Description
Serial Number 7-6689 Type Registration
Individual
Manufacturer Name MIREK ANDREW Certificate Issue
Date 11/01/2007
Model STOL CH 701 Status Valid
Type Aircraft Fixed Wing Single-Engine Type Engine
4 Cycle
Pending Number Change None 0123456789
0
[quote][b]
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