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W20 Bracket spec

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barp99(at)gmail.com
Guest

Posted: Thu Oct 01, 2020 3:45 pm Post subject: W20 Bracket spec

I am currently attaching the port flap to the wing on my trigear, I 

find, for whatever reason, that the W20 bracket is too short by 12mm 

when the flap is in its correct position. Rather than live with this 

mismatch at the bolted joint, I will make up a new longer W20 bracket. 

Does anyone know what grade and temper these aluminium brackets are made 

from?



Brian

Sydney, Aus.

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Patrick Tunney

Joined: 24 Sep 2010
Posts: 33

Posted: Fri Oct 02, 2020 11:58 am Post subject: Re: W20 Bracket spec

Brian



I am not 100% sure but i think its Duralumin 



Im sure plenty of builders have had issues with flap hinge alignment.

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John Wighton

Joined: 18 May 2010
Posts: 241

Posted: Sat Oct 03, 2020 12:15 am Post subject: Re: W20 Bracket spec

Use a minimum of 6061 T6, probably 2024 T3 will be readily available and gives slightly higher UTS.

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_________________
John Wighton
Europa XS trigear G-IPOD

Duncan McFadyean

Joined: 18 Jan 2011
Posts: 219

Posted: Sat Oct 03, 2020 12:56 am Post subject: W20 Bracket spec

H30, I believe. But why not ask the Factory what they use now?   



   

Duncan McF.    	  Quote: 	
		      On 02 October 2020 at 00:30 Brian Phillips <barp99(at)gmail.com (barp99(at)gmail.com)> wrote:    

    

    

I am currently attaching the port flap to the wing on my trigear, I     

find, for whatever reason, that the W20 bracket is too short by 12mm     

when the flap is in its correct position. Rather than live with this     

mismatch at the bolted joint, I will make up a new longer W20 bracket.     

Does anyone know what grade and temper these aluminium brackets are made     

from?    

    

Brian    

Sydney, Aus.

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JonathanMilbank

Joined: 14 Apr 2012
Posts: 388
Location: Aberdeen area

Posted: Sat Oct 03, 2020 7:20 am Post subject: Re: W20 Bracket spec

It's now 25 years since I built my Classic wings with the foam cores and I honestly can't remember the finer details, but are all the W20 brackets on each wing the same size, or are they made progressively smaller from inboard to outboard?

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wdaniell.longport(at)gmai
Guest

Posted: Sat Oct 03, 2020 5:38 pm Post subject: W20 Bracket spec

BrianIt looks to me as thought the lower surface of the flap is not aligned with the lower surface of the wing...or is it just how it looks in the photo?

Will



William Daniell

LONGPORT

+57 310 295 0744

On Thu, Oct 1, 2020, 19:49 Brian Phillips <barp99(at)gmail.com (barp99(at)gmail.com)> wrote:



 	  Quote: 	
		  

 I am currently attaching the port flap to the wing on my trigear, I 

 find, for whatever reason, that the W20 bracket is too short by 12mm 

 when the flap is in its correct position. Rather than live with this 

 mismatch at the bolted joint, I will make up a new longer W20 bracket. 

 Does anyone know what grade and temper these aluminium brackets are made 

 from?

 

 Brian

 Sydney, Aus.

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barp99(at)gmail.com
Guest

Posted: Sun Oct 04, 2020 1:41 am Post subject: W20 Bracket spec

William, I think its just the photo, I put a rule on the lower     surface and checked the intersection, its hard to tell for sure but     its very close to being laminar.

     

     Cheers,

     Brian.

     

     On 4/10/2020 12:36 pm, William Daniell       wrote:

     

      	  Quote: 	
		                         Brian           It looks to me as thought the lower surface of             the flap is not aligned with the lower surface of the             wing...or is it just how it looks in the photo?

           Will

             

             William               Daniell

               LONGPORT

               +57 310 295 0744

           

           

                        On Thu, Oct 1, 2020, 19:49               Brian Phillips <barp99(at)gmail.com (barp99(at)gmail.com)> wrote:

             

              	  Quote: 	
		  

               I am currently attaching the port flap to the wing on my               trigear, I 

               find, for whatever reason, that the W20 bracket is too               short by 12mm 

               when the flap is in its correct position. Rather than live               with this 

               mismatch at the bolted joint, I will make up a new longer               W20 bracket. 

               Does anyone know what grade and temper these aluminium               brackets are made 

               from?

               

               Brian

               Sydney, Aus.

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budyerly@msn.com

Joined: 05 Oct 2019
Posts: 286
Location: Florida USA

Posted: Sun Oct 04, 2020 12:01 pm Post subject: Re: W20 Bracket spec

Brian,

You can never go wrong with 6061-T6  1/8 inch sheet.  



The advice given is quite good.  

1.  Be sure to make the flap fit on the left and right absolutely identical in gap between flap LE and closeout, dead level with the bottom of the wing.  Make the line through the inboard and outboard flap eyes even and at the right point using the template.  Middle flap bracket is set with string.  IF THE FLAP W19 OR 20 IS TOO SHORT: Lay out your template and assure the wing flap is positioned per the manual using the incidence board and dead level with the bottom of the wing then clamp your W19/20 brackets.  If too short, simply draw out a new one out of carboard for the outer shape and make another out of 1/8 6061-T6  After fab is complete, clamp in place and check operation.  If off laterally due to a FL1 or 2 misalignment , you may either bend the W19/20 or use a spacer to displace the bracket to allow smooth operation.



2.  I don't set my flap pins exactly like the manual.  I use a compass (actually a 3/4 inch thick stick and pin/pen).  Each flap drive pin needs to be set the same.  I find that the swing of the flap tube and hinges is slightly off as indicated in the manual and by using a large "compass" I can set each flap pin so it is exactly in line with the hinges.  It is not a big deal, but for those of you always having to lift or pull down on a flap to get the flap engaged with the wing pins in alignment, that is your problem or at least part of it. 



I've attached a picture for my shop technique on the compass concept.



Best Regards,

Bud Yerly

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