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Datum Line

 
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BobbyPaulk(at)comcast.net
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PostPosted: Fri Jun 28, 2013 12:08 pm    Post subject: Datum Line Reply with quote

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.

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jaybannist(at)cs.com
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PostPosted: Fri Jun 28, 2013 12:58 pm    Post subject: Datum Line Reply with quote

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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PostPosted: Fri Jun 28, 2013 1:03 pm    Post subject: Datum Line Reply with quote

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

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mhubel



Joined: 05 Sep 2009
Posts: 141

PostPosted: Fri Jun 28, 2013 6:05 pm    Post subject: Datum Line Reply with quote

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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_________________
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

PostPosted: Tue Jul 09, 2013 5:25 pm    Post subject: Re: Datum Line Reply with quote

Bobby,

Here is a link to the XL area of the zbuilder site. The worksheet says the plumb line is 1790mm from center line.

http://www.zenithair.com/zodiac/xl/data/xl-w&b-2-page.pdf


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Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
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paulrod36(at)msn.com
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PostPosted: Wed Jul 10, 2013 11:41 am    Post subject: Datum Line Reply with quote

<?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] ---


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