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BobbyPaulk(at)comcast.net
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 Posted: Fri Jun 28, 2013 12:08 pm Post subject: Datum Line |
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p { margin: 0; }Guys,
Can anyone verify what station on the wings to drop a plumb line to get the proper Datum line.
My information says it is the fourth nose rib or the one just outside the fuel tank ( 15 gal. ).
I now hear that we should add 20mm outboard of this rib.
I am helping a friend get his ready to weigh and would like to know. I used the fourth rib and have not had any problems.
Is there a place on the Zenith website that would show the latest info?
The distance from my right wheel to the datum is 26.016" The left is about 5/16" less. Is this close to what most are getting?
Thank you for your help
Bobby ( age 75 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 285 Needle Jet
Status - Flying 181 hrs.
Do Not Archive
[quote][b]
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jaybannist(at)cs.com
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| Posted: Fri Jun 28, 2013 12:58 pm Post subject: Datum Line |
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Bobby,
There is no "proper datum line." The datum can be anywhere you want it. Most find it convenient to locate it at the leading edge of the wing. I chose to locate my datum line at the leading edge of the wing, adjacent to the fuselage, taking the forward sweep of the wing out of the picture. I suppose locating it further out on the wing could make it easier to draw on the floor.
Both my main gear wheels were the same distance from the datum.
Jay
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larrycmcfarland(at)gmail.
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| Posted: Fri Jun 28, 2013 1:03 pm Post subject: Datum Line |
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HI Bobby,
You can use any point you wish for a Datum line, so long as you’re consistent with it.
The sum of the moments divided by total weight will locate a CG for any object.
Zenith would have you loading the CG limits to the design they established though.
Larry McFarland (age 73)
From: owner-zenith601-list-server(at)matronics.com [mailto:owner-zenith601-list-server(at)matronics.com] On Behalf Of BobbyPaulk(at)comcast.net
Sent: Friday, June 28, 2013 3:08 PM
To: zenith601-list(at)matronics.com
Subject: Datum Line
Guys,
Can anyone verify what station on the wings to drop a plumb line to get the proper Datum line.
My information says it is the fourth nose rib or the one just outside the fuel tank ( 15 gal. ).
I now hear that we should add 20mm outboard of this rib.
I am helping a friend get his ready to weigh and would like to know. I used the fourth rib and have not had any problems.
Is there a place on the Zenith website that would show the latest info?
The distance from my right wheel to the datum is 26.016" The left is about 5/16" less. Is this close to what most are getting?
Thank you for your help
Bobby ( age 75 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 285 Needle Jet
Status - Flying 181 hrs.
Do Not Archive
| Quote: | | http://www.matronics.com/Navigator?Zenith601-List |
01234567
[quote][b]
| | - The Matronics Zenith601-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith601-List |
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mhubel
Joined: 05 Sep 2009
Posts: 141
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| Posted: Fri Jun 28, 2013 6:05 pm Post subject: Datum Line |
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Bobby,
As pointed out, to use Zenith's recommended CG limits (which you really should) you do have to start with their datum point. I believe the good news is that the CH601 leading edge is basically perpendicular to the centerline (at least the CH601XL is) so the exact spot is not too critical, I can't see that +/- 20 mm along the leading edge makes any measurable difference.
On 06/28/2013 5:03 PM, Larry McFarland wrote:
| Quote: | <![endif]--> <![endif]-->
HI Bobby,
You can use any point you wish for a Datum line, so long as you’re consistent with it.
The sum of the moments divided by total weight will locate a CG for any object.
Zenith would have you loading the CG limits to the design they established though.
Larry McFarland (age 73)
From: owner-zenith601-list-server(at)matronics.com (owner-zenith601-list-server(at)matronics.com) [mailto:owner-zenith601-list-server(at)matronics.com (owner-zenith601-list-server(at)matronics.com)] On Behalf Of BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net)
Sent: Friday, June 28, 2013 3:08 PM
To: zenith601-list(at)matronics.com (zenith601-list(at)matronics.com)
Subject: Datum Line
Guys,
Can anyone verify what station on the wings to drop a plumb line to get the proper Datum line.
My information says it is the fourth nose rib or the one just outside the fuel tank ( 15 gal. ).
I now hear that we should add 20mm outboard of this rib.
I am helping a friend get his ready to weigh and would like to know. I used the fourth rib and have not had any problems.
Is there a place on the Zenith website that would show the latest info?
The distance from my right wheel to the datum is 26.016" The left is about 5/16" less. Is this close to what most are getting?
Thank you for your help
Bobby ( age 75 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 285 Needle Jet
Status - Flying 181 hrs.
Do Not Archive
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9 [quote][b]
| | - The Matronics Zenith601-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith601-List |
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_________________
Mark Hubelbank
N708HU
CH601XL
Jabiru 3300
Rotec TBI 40-3 carb
Sensenich ground adj prop.
240 hr TAF
Pictures at photo.hubbles.com |
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Ron Lendon
Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI
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paulrod36(at)msn.com
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| Posted: Wed Jul 10, 2013 11:41 am Post subject: Datum Line |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Maybe I just missed it, but does anybody know if there's a separate worksheet for taildraggers?
Paul Rodriguez
[quote] ---
| | - The Matronics Zenith601-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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