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W19 & w20

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phillik747

Joined: 04 Apr 2012
Posts: 73
Location: Birminham, AL USA

Posted: Sat Jan 19, 2013 6:59 pm Post subject: W19 & w20

After the wings were painted the holes on w19/w20 don't allign with w18.  I couldn't find a value for how much material I can remove from the brackets and still be in "limits."  I like to avoid sanding down into the paint to make room for the brackets.   

Also on a side note, the top port for the AOA was filled and painted over.  Any tricks to clearing out the hole? 

Thank you,

 Kyle Phillipson  [quote][b]

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_________________
Kyle
Europa Tri-gear (under construction)

jan_de_jong(at)casema.nl
Guest

Posted: Sun Jan 20, 2013 12:57 am Post subject: W19 & w20

There is a "minimum dimension" in chapter 9. It would appear that     the distance from hole to edge must be a good 1.5 times the diameter     of the bolt - which is a standard if I remember correctly. This     comes to 7.14 mm for AN3. The manual requires 7.62 mm.

     

     Jan de Jong

     

     On 1/20/2013 3:58 AM, Kyle P wrote:

     

     [quote]       

After the wings were painted the holes on w19/w20 don't allign         with w18.  I couldn't find a value for how much material I can         remove from the brackets and still be in "limits."  I like to         avoid sanding down into the paint to make room for the brackets.              

Also on a side note, the top port for the AOA was filled and         painted over.  Any tricks to clearing out the hole?       

Thank you,

         Kyle Phillipson        	  Quote: 	
		  

	
     [b]

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budyerly(at)msn.com
Guest

Posted: Sun Jan 20, 2013 12:14 pm Post subject: W19 & w20

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Kyle,

 The W 18s normally get filled with filler on the wing until the W 19  bracket won't fit.  That is what I am assuming the problem is.

  

 Normally I profess for my clients to use a 2 D edge distance. (Ref TO  1-1A or similar)  That is 3/8" 10mm from the edge of the hole and  is a standard, however if you look at Chapter 9 of the Mono manual You can see  that the wing skin to hole center was supposed to be about 13 mm or 1/2  inch.  (The fore and aft edge distance was supposed to be 13 mm  also.)  That means from the edge of the hole to the wing skin is supposed  to be 3/32 less 1/2 or 13/32 or with glue etc. ended up at about 3/8 inch.   

  

 When my painter finishes I grind the paint and filler away to get my  flap hinges to fit rather than compromise my edge distance.  It takes 5  minutes to touch up the paint.  I know you would prefer to grind and go to  final assembly, however, I would rather you not grind off your flap  bracket.

  

 Also note that grinding on the aluminum tends to cause micro fractures and  when you eventually hit your flap you may end up with a small crack that the  bolt and washers tend to cover up until you notice the flap bracket is  loose.  Use a good smooth file for proper smoothing afterwards.

  

 It seems the upholsterers tend to lean on the flaps during their work, or  the mono  snags a landing light, tie down tire or something so flap damage  must be anticipated, therefore a little extra meat is best in the flap  brackets.  A painter just fills and paints and doesn't  necessarily care about their attention to fit and finish once the  plane is taken apart, they figure it's your job to put it together.  The  painter (or we amateurs)also fill aileron gaps, door sill and hinge gaps, static  pressure ports on your pitot tube, and your AOA, as you found out.  I never  contract a painter without his agreeing to touch up after the 40 hours for just  this reason, even if the plane was trial assembled for clearances after priming  and before final paint.  

  

 If the AOA was not installed with an access panel or drain / moisture tap  on the underside (Looks like a fuel drain in the wing bottom) that allows  cleaning and draining of the upper port water out of the bottom or for  future maintenance.  If not, you need to look for a pin hole.  Tap  around the area you placed the fitting and you'll find the area.  Hopefully  it has a small pin hole in your paint finish.  If you can reach your static  fitting, from a tip light hole or such with a probe or long needle nose, then  disconnect the tube and use your long angle drill and a #60 bit to poke through  the fitting.  If no access is possible, then you can find  general area by tapping or use your measurements from the build.   Assuming AOA install was made without regard to maintenance, make a small  hole (1 inch or so) to gain access from below.  Cover the hole with a small  plumbing or furniture cap.  I suggest a stick on decal to mark where the  hole is for washing and waxing later on. 

  

 The work now is worth it in the long run. 

  

 Regards,

 Bud Yerly

 Tech Support

  

  

  

  

 [quote]   ---

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Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Mon Jan 21, 2013 2:25 am Post subject: W19 & w20

Bud,

		You wrote:

 	  Quote: 	
		  When my painter finishes I grind the paint and filler away to get my flap hinges to fit rather than compromise my edge distance.  It takes 5 minutes to touch up the paint.  I know you would prefer to grind and go to final assembly, however, I would rather you not grind off your flap bracket. 	




		I'm confused.  This may be a silly question, but to which surfaces do you refer when you say, "I grind the paint and filler away"...?

		Fred



 [quote][b]

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phillik747

Joined: 04 Apr 2012
Posts: 73
Location: Birminham, AL USA

Posted: Mon Jan 21, 2013 11:32 am Post subject: Re: W19 & w20

Bud & Jan,



Thank you for the reply and information.  I will proceed with Bud's advice and sand down the paint/fill next to w18 to allow alignment of the bolts.

Thank you,

Kyle Phillipson

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_________________
Kyle
Europa Tri-gear (under construction)

budyerly(at)msn.com
Guest

Posted: Fri Jan 25, 2013 5:41 pm Post subject: W19 & w20

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Fred,

 It is an unfortunate filling problem when the filler is not the aircraft  owner.  He builds up filler on everything especially the flap bracket  supports sticking out of the wing.  Especially the inboard one because of  the wing fillet and between the outboard ones because it is hard to get to, so I  will remove his excess filler to get back to my original skin to mount my flap  brackets.

 Bud

 [quote]   ---

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