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Kelvin Weston
Joined: 14 Apr 2010
Posts: 90
Location: Hampshire, UK
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 Posted: Wed Sep 10, 2014 12:43 pm Post subject: Fwd Aft movement at wing tip |
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All
Have just finished fitting the fwd W27 and aft W26 wing sockets to the fuselage and everything looks good. Wing angle is good on both sides and checked at mid-point and wing tip.
Fwd aft sweep measured at several points is good. String from each wingtip is parallel with the spars.
Both wings assemble easily and both main spar pins fit with a firm push and a bit of effort.
However, when assembled there is a small amount of fwd aft movement at both wingtips relative to the fuselage.
As far as I can tell this is entirely due to the movement of the parts making up the aft W26 socket. The pip pin is a good fit and the small amount of movement is between the W26C barrel and the W26A body.
It is a small movement but over the span of the wing is obviously magnified.
I have checked the gap between the fwd W27 sockets and the wing root rib and the gap is 0.8 to 0.9mm both sides.
Should I be worried about this fwd aft movement.
I have no wing root fairings on at present and guess this would help limit the fwd aft movement when finally fitted.
I hope I am worrying about nothing but all opinions, views appreciated to put my mind at rest.
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Regards
Kelv Weston
Kit 497
kelv@kdweston.co.uk |
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tennant
Joined: 19 Apr 2011
Posts: 121
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| Posted: Thu Sep 11, 2014 1:18 am Post subject: Re: Fwd Aft movement at wing tip |
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Hi Kelvin,
Only a comment - not a recommendation!!
I have had some slight back and fore movement on my right wing for 17 years and 700 hrs.
Barry
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Barry Tennant
D-EHBT
At EDLM - Germany |
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budyerly(at)msn.com
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| Posted: Thu Sep 11, 2014 4:16 am Post subject: Fwd Aft movement at wing tip |
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Kevin,
When rigged properly, all rigging pins in, the wing root pins screwed in tight or to one thread, the forward socket should be just touching the root rib to out no more than 1/32" . The spar sockets and spar strap must be installed.
The structure will flex a bit in and out. With about 10 pounds of force pushing aft on the tip the forward pin will pull out about 1/16 inch. The rear sockets are solid once the mod 52 tie bar is installed.
Once the sockets are on, you may need to tweak your sweep. Please make sure your forward pin is in the socket fully to 1/32". There should be no bending load on the front pin.
Best Regards,
Bud Yerly
Sent from my Verizon Wireless 4G LTE DROID
Kelvin Weston <kelv(at)kdweston.biz> wrote:
All
Have just finished fitting the fwd W27 and aft W26 wing sockets to the fuselage and everything looks good. Wing angle is good on both sides and checked at mid-point and wing tip.
Fwd aft sweep measured at several points is good. String from each wingtip is parallel with the spars.
Both wings assemble easily and both main spar pins fit with a firm push and a bit of effort.
However, when assembled there is a small amount of fwd aft movement at both wingtips relative to the fuselage.
As far as I can tell this is entirely due to the movement of the parts making up the aft W26 socket. The pip pin is a good fit and the small amount of movement is between the W26C barrel and the W26A body.
It is a small movement but over the span of the wing is obviously magnified
| | - The Matronics Europa-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?Europa-List |
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spcialeffects
Joined: 29 Aug 2012
Posts: 306
Location: Kent
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| Posted: Thu Sep 11, 2014 7:51 am Post subject: Re: Fwd Aft movement at wing tip |
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Hi Kevin. I too have just finished fitting the wing pin sockets. I'm not near my aircraft at the moment as I am away on holiday and so can't check how much movement, if any, there is but the question I want to ask you is if you have fitted the top on as prior to the top and stiffening strips being fitted everything is flexible.
Frank
| | - The Matronics Europa-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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Kelvin Weston
Joined: 14 Apr 2010
Posts: 90
Location: Hampshire, UK
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| Posted: Thu Sep 11, 2014 11:24 am Post subject: Re: Fwd Aft movement at wing tip |
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Barry
17 years and 700 hours in a Europa, now I am really jealous.
Bud
Thanks for the info. I measured the gap between wing root and fwd socket again. It is 0.8mm one side and 0.9mm the other. slightly more than 1/32 (0.79mm) but not by much. Both pins extend just beyond the inboard face of the fwd sockets. No bending loads evident on the fwd pins, they slide nicely into the sockets when rigging.
The spar strap and tie bar are not done yet but both spar sockets are on and the port main spar pin is adjusted for length as per the manual.
Frank
Hope you had the same feeling of satisfaction I had seeing the wings on.
Top is not on and stiffeners not done yet. However, I do have a very sturdy build cradle and temporarily secured the top in place with skin pins about every 8 inches. I understand what you mean about everything being flexible.
With a helper moving the wing tip, the slight, fwd aft clunk-clunk movement can definitely be tracked back to the movement of the W26C barrel within the lugs of the W26A body.
It is a very small movement at the socket, almost not visible but can be felt with a finger on the assembly. Over the length of the wing it becomes a more obvious movement at the tip although still small.
It is the same both sides so unless I have two bad W26 socket assemblies, I am probably worrying about nothing.
| | - The Matronics Europa-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?Europa-List |
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_________________
Regards
Kelv Weston
Kit 497
kelv@kdweston.co.uk |
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