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Yak-55M Airframe Hardware

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g.hendricks(at)sbcglobal.
Guest

Posted: Tue Sep 02, 2008 7:47 pm Post subject: Yak-55M Airframe Hardware

OK all you Yakers...anybody out there planning a trip through Ismailovsky Park just north of Moscow anytime soon ??  

   

I’m trying to find floating nutplates that are used to attach Fairings covering the ~ 3inch gap between the Wing Butt and the Fuselage. There are about 6 or 8 on top and the same underneath the Wing. These nutplates have two lugs and look almost identical to the NAS686 except they are metric.  

   

Best I can tell the rivet (lug) spacing is 16mm and the fasteners are 4mm.   

   

My Yak-55M has two that are missing the floating part, and two more that are stripped out and should be replaced.  

   

I’ve tried every place in the US I can think of and no one on this side of the Pond carries metric floating nutplates.  

   

Any chance anybody knows where I can find these nutplates ??   

   

The Metric Screw and Tool and other metric specialty houses say they only carry metric panel screws...no nutplates.  

   

Also, the lower pindle bolt on the rudder uses a castellated shear nut keyed with a cotter pin (split pin) to hold on the rudder, and needs replacement. It looks like an AN320; however, it is metric. It appears to be a 6 or 7 mm, but with fine threads. My metric thread gage has nothing to match it...must be some specialized metric nut that was used by the Russians...any notion about what it could be and where to get them ?  

   

Any help would be appreciated..this is all thats is holding me on the ground with this airplane.   

   

George Hendricks  

Fort Worth, TX     

   

       [quote][b]

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dsavarese0812(at)bellsout
Guest

Posted: Wed Sep 03, 2008 2:46 am Post subject: Yak-55M Airframe Hardware

George,

 Have you tried replacing the broken nutplates with metric  rivnuts?  Drill out the center of the broken nut plate and replace with a  metric rivnut.  They are readily available.  http://mdmetric.com/prod/rivetnuttool/rivetnuttool.htm   You'll need a rivnut tool of course.  But they are not that  expensive.  Look down the page on the link I sent and you will see the  prices for just metric rivnuts.

 Dennis

  

 [quote]   ---

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scott-p(at)texas.net
Guest

Posted: Wed Sep 03, 2008 3:06 am Post subject: Yak-55M Airframe Hardware

Hi George,



For the small metric castellated nut, check a fine thread US nut--I have 

discovered that there are a number of odd-sized (like 5.5 mm) nuts and 

screws on the airplane that don't have standard metric threads, which 

when you place the nearest sized US-standard on they fit perfectly. It's 

weird, but I think some of these are reversed engineered from US standard...



For my money I'd just replace the wing-fairing nut plates with US, and 

put in US screws. My fairings are about half-and-half right now (I use 

flat-headed US to differentiate from the Russian pan-heads) and it works 

fine. A bit of gymnastics to put them in place initially, but worth it 

down the road.



Scott



g.hendricks(at)sbcglobal.net wrote:

 	  Quote: 	
		  

 OK all you Yakers...anybody out there planning a trip through 

 Ismailovsky Park just north of Moscow anytime soon ??



 I’m trying to find floating nutplates that are used to attach Fairings 

 covering the ~ 3inch gap between the Wing Butt and the Fuselage. There 

 are about 6 or 8 on top and the same underneath the Wing. These 

 nutplates have two lugs and look almost identical to the NAS686 except 

 they are metric.



 Best I can tell the rivet (lug) spacing is 16mm and the fasteners are 

 4mm.



 My Yak-55M has two that are missing the floating part, and two more 

 that are stripped out and should be replaced.



 I’ve tried every place in the US I can think of and no one on this 

 side of the Pond carries metric floating nutplates.



 Any chance anybody knows where I can find these nutplates ??



 The Metric Screw and Tool and other metric specialty houses say they 

 only carry metric panel screws...no nutplates.



 Also, the lower pindle bolt on the rudder uses a castellated shear nut 

 keyed with a cotter pin (split pin) to hold on the rudder, and needs 

 replacement. It looks like an AN320; however, it is metric. It appears 

 to be a 6 or 7 mm, but with fine threads. My metric thread gage has 

 nothing to match it...must be some specialized metric nut that was 

 used by the Russians...any notion about what it could be and where to 

 get them ?



 Any help would be appreciated..this is all thats is holding me on the 

 ground with this airplane.



 George Hendricks



 Fort Worth, TX



 *

 *

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viperdoc(at)mindspring.co
Guest

Posted: Wed Sep 03, 2008 5:27 am Post subject: Yak-55M Airframe Hardware

This will involve going off shore and the shipping cost sux but try West London Aeroclub.   http://www.wlacrussianeng.co.uk/ They have a bunch of YAK parts and Suk also. Not cheap by US standards though.  

Doc  

       

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of g.hendricks(at)sbcglobal.net

 Sent: Tuesday, September 02, 2008 10:46 PM

 To: yak-list(at)matronics.com

 Subject: Yak-55M Airframe Hardware  

  

  

   

OK all you Yakers...anybody out there planning a trip through Ismailovsky Park just north of Moscow anytime soon ??  

   

I’m trying to find floating nutplates that are used to attach Fairings covering the ~ 3inch gap between the Wing Butt and the Fuselage. There are about 6 or 8 on top and the same underneath the Wing. These nutplates have two lugs and look almost identical to the NAS686 except they are metric.  

   

Best I can tell the rivet (lug) spacing is 16mm and the fasteners are 4mm.   

   

My Yak-55M has two that are missing the floating part, and two more that are stripped out and should be replaced.  

   

I’ve tried every place in the US I can think of and no one on this side of the Pond carries metric floating nutplates.  

   

Any chance anybody knows where I can find these nutplates ??   

   

The Metric Screw and Tool and other metric specialty houses say they only carry metric panel screws...no nutplates.  

   

Also, the lower pindle bolt on the rudder uses a castellated shear nut keyed with a cotter pin (split pin) to hold on the rudder, and needs replacement. It looks like an AN320; however, it is metric. It appears to be a 6 or 7 mm, but with fine threads. My metric thread gage has nothing to match it...must be some specialized metric nut that was used by the Russians...any notion about what it could be and where to get them ?  

   

Any help would be appreciated..this is all thats is holding me on the ground with this airplane.   

   

George Hendricks  

Fort Worth, TX     

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       [quote][b]

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dougsappllc(at)gmail.com
Guest

Posted: Wed Sep 03, 2008 7:42 am Post subject: Yak-55M Airframe Hardware

George,

 I have some 4mm and 5mm floating nut plates which I bought in Russia to restore my Yak 18 (CJ5).  Do you have a photo of the plate which you need?



Also the "jesus" nut on the bottom attach point of the rudder on the CJ6 sounds like what you have described.  I have them in stock.   do you have a CJ6 nearby to check it?

   

 Best from here,

 Doug

  

  

  

 On Tue, Sep 2, 2008 at 8:46 PM, <g.hendricks(at)sbcglobal.net (g.hendricks(at)sbcglobal.net)> wrote:

  	  Quote: 	
		     

OK all you Yakers...anybody out there planning a trip through Ismailovsky Park just north of Moscow anytime soon ??  

  

I'm trying to find floating nutplates that are used to attach Fairings covering the ~ 3inch gap between the Wing Butt and the Fuselage. There are about 6 or 8 on top and the same underneath the Wing. These nutplates have two lugs and look almost identical to the NAS686 except they are metric.  

  

Best I can tell the rivet (lug) spacing is 16mm and the fasteners are 4mm.  

  

My Yak-55M has two that are missing the floating part, and two more that are stripped out and should be replaced. 

  

I've tried every place in the US I can think of and no one on this side of the Pond carries metric floating nutplates.  

  

Any chance anybody knows where I can find these nutplates ??  

  

The Metric Screw and Tool and other metric specialty houses say they only carry metric panel screws...no nutplates. 

  

Also, the lower pindle bolt on the rudder uses a castellated shear nut keyed with a cotter pin (split pin) to hold on the rudder, and needs replacement. It looks like an AN320; however, it is metric. It appears to be a 6 or 7 mm, but with fine threads. My metric thread gage has nothing to match it...must be some specialized metric nut that was used by the Russians...any notion about what it could be and where to get them ?  

  

Any help would be appreciated..this is all thats is holding me on the ground with this airplane.  

  

George Hendricks 

Fort Worth, TX     

 

 	  Quote: 	
		  

	


	


-- 

Always Yakin,

Doug Sapp

Phone 509-826-4610

Fax 509-826-3644



  [quote][b]

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