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Request for Info

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mark.bitterlich(at)navy.m
Guest

Posted: Wed Sep 06, 2006 3:19 pm Post subject: Request for Info

I've had an on-going problem that many YAK-52 and 50 owners will run

into themselves if they hang onto their aircraft long enough.  This

problem relates to the cowling (both upper and lower halves) and the way

it has a 180 degree circular aluminum tube to which the actual metal of

the cowl is rolled around and then riveted to.  



This aluminum tube rests against a metal ring that the engine shutters

attach to, and over time it will simply wear through (from vibration) or

crack, sometimes in not one, but many places.  Any cracks in these tubes

should not be ignored, because as they propagate, they will eventually

go all the way around the tube itself causing it to fail.  When this

happens, you can expect to see cracks develop in the actual cowling

sheet metal itself since it is now carrying the load. What happens after

that is not pretty.  



Cracks in this tubing can happen more quickly and with more extensive

damage if the leather pads that are part of the engine baffling

arrangement are allowed to deteriorate.  These pads are essential to

holding the cowl in place and helping to dampen certain vibration.

Needless to say, I have learned all of this the hard way.  My YAK-50 has

about 700 hours on it now and it has been flown hard.  The worst of my

damage was due to a previous owner removing the engine shutters, but

that is another story.  



As these tubes have cracked in my aircraft, I have filled them with 9309

Hysol epoxy.  This was a temp. fix at best, but gave me a few years of

grace before the problem eventually came back.  



Now I am faced with not only replacing these tubes, but better yet...

redesigning them to prevent this problem from coming back in the future.

I have managed to obtain two "virgin" tubes from Romania with all the

requisite hardware, but instead of using them, I would like to send them

someplace to be used as a "form" in order to have new tubes made of thin

wall stainless steel.  The replacement tubes would have to be dead on

perfect (size/shape/arc/thickness, etc) to work.  



Does anyone know of any anyone in the country, individual or firm, that

can take these tubes and duplicate them EXACTLY out of another material?

It would be worthwhile for ALL of us to find someone like this and allow

them to make some up for stock.  For proof of this, take a hard look at

these tubes that I am talking about in YOUR 50 or 52.  



If the folks over in England have already solved this problem (Rob

Kent?) PLEASE let me know.  



Best Regards to all, 



Mark Bitterlich

N50YK

Mike Bell

Joined: 10 Jan 2006
Posts: 51

Posted: Sun Sep 10, 2006 6:28 pm Post subject: Re: Request for Info

Mark, the guy who used to make radial engine exhaust systems in Jumping Branch, WV was quite expert at bending tubing. I believe he retired and sold the radial engine exhaust business to either Kimball or Culp. Maybe that kind of expertise could do the job?

_________________
Mike Bell
Elk Grove, CA
avbell2(at)comcastdotnet

KingCJ6(at)aol.com
Guest

Posted: Sun Sep 10, 2006 6:34 pm Post subject: Request for Info

Does anyone have the new contact info, we need a replacement piece?

  

 Thanks, Dave

  

 In a message dated 9/10/2006 7:30:19 PM Pacific Daylight Time, yakflyr(at)comcast.net writes:

  	  Quote: 	
		  Mark, the guy who used to make radial engine exhaust systems in Jumping Branch, WV was quite expert at bending tubing. I believe he retired and sold the radial engine exhaust business to either Kimball or Culp. Maybe that kind of expertise could do the job? 	


 

  [quote][b]

viperdoc(at)mindspring.co
Guest

Posted: Sun Sep 10, 2006 7:22 pm Post subject: Request for Info

I bought a couple of replacement sections from Steve Culp. I am not sure he took over the production of the exact pipes though. He does have a few extra sections fo the exhaust though.

 Doc

  

 



  

 [quote] ---

jimscjs(at)mbay.net
Guest

Posted: Sun Sep 10, 2006 10:17 pm Post subject: Request for Info

I have a New Stainless Steel Set if anyone is looking for  one.

 Jim

 [quote]   ---

jsfox(at)adelphia.net
Guest

Posted: Mon Sep 11, 2006 4:32 am Post subject: Request for Info

Also Aircraft Exhaust  is now making stainless exhaust for the M14P, did mine several months ago and it's really nice. They now are looking for an old Huosai exhaust so they can make the template for the CJ exhaust

Contact info: http://www.aircraftexhaust.net/

1-800-770-7287

talk to Chris Steppe or Rich

Steve Fox



On Sep 11, 2006, at 2:16 AM, Jim wrote:

[quote]I have a New Stainless Steel Set if anyone is looking for one.

Jim

[quote]---

bpx2horn(at)aol.com
Guest

Posted: Mon Sep 11, 2006 6:31 am Post subject: Request for Info

Steve,

    

   What was the cost for the exhaust?

    

   Paul Hornick 

    

  

 --

jsfox(at)adelphia.net
Guest

Posted: Mon Sep 11, 2006 6:44 am Post subject: Request for Info

The cost is $2750. They are also working on a optional dual heat muff instead of a single. The price will probably be an extra $100 or so.

Steve



On Sep 11, 2006, at 10:06 AM, bpx2horn(at)aol.com (bpx2horn(at)aol.com) wrote:

[quote]Steve,

 

What was the cost for the exhaust?

 

Paul Hornick 

 

 --

kelmonroe(at)comcast.net
Guest

Posted: Mon Sep 11, 2006 8:11 am Post subject: Request for Info

I just talked to Rich and offered him my core  engine. So he may be making systems soon.  Thanks kelley

 [quote]   ---

mark.bitterlich(at)navy.m
Guest

Posted: Tue Sep 12, 2006 11:19 am Post subject: Request for Info

Thanks Mike.... And everyone else too.  



Mark

--

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