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Tiger forward spinner bulkhead

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teamgrumman(at)YAHOO.COM
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Posted: Wed Sep 01, 2010 1:11 pm Post subject: Tiger forward spinner bulkhead

As I'm sure a lot of you know, the forward spinner bulkhead is notorious for cracking.  About 2 years is all I expect one to last.  I've tried everything from different tightening patterns of the screws to over-boring the holes by .010 inches.  Nothing seems to work.  Prop imbalance may contribute, but who knows.

I'm doing an annual on a Tiger that has a forward spinner bulkhead that was installed in 1990.  This spinner shows no signs of cracking.  What is immediately noticeable is it's painted black.  It is NOT alodined/plated.  The black paint is chipped and pealing and worn through in many places.  I talked to Garner and he told me he knew of no changes to the manufacturing specifications.  I would like to  know what this material is.  I doubt it 2024.



   



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flyv35b(at)minetfiber.com
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Posted: Wed Sep 01, 2010 1:29 pm Post subject: Tiger forward spinner bulkhead

Just because it's painted black doesn't mean the  material is different.  Garner has the drawing.  What is the material  call out on the drawing?

  

 I have a couple of customers at least that have  aluminum forward bulkheads that are quite a few years old with no  cracks.

  

 Cliff

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teamgrumman(at)YAHOO.COM
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Posted: Wed Sep 01, 2010 3:43 pm Post subject: Tiger forward spinner bulkhead

I apologize if I made it sound like painting the bulkhead black meant it was made out of a different material.  I only commented that the bulkhead was painted black and that it was not alodined.

I think this bulkhead is made of a different material because it has laster longer than what I would expect.  That's all.  

From: flyv35b <flyv35b(at)minetfiber.com>

To: teamgrumman-list(at)matronics.com

Sent: Wed, September 1, 2010 2:27:54 PM

Subject: Re: Tiger forward spinner bulkhead

     DIV { MARGIN:0px;}      Just because it's painted black doesn't mean the  material is different.  Garner has the drawing.  What is the material  call out on the drawing?

 I have a couple of customers at least that have  aluminum forward bulkheads that are quite a few years old with no  cracks.

 Cliff

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flyv35b(at)minetfiber.com
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Posted: Wed Sep 01, 2010 4:03 pm Post subject: Tiger forward spinner bulkhead

I think this bulkhead is made of a different material because it has laster  longer than what I would expect.  That's all.  

  

 I think it's just the luck of the draw due to spinner  alignment and engine balance.

  

 Cliff

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pitts_pilot(at)bellsouth.
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Posted: Wed Sep 01, 2010 4:25 pm Post subject: Tiger forward spinner bulkhead

I wouldn't think the material would be different ..... the many     blanks are cut from one sheet of material.  However, I think Cliff     is close ...... if there's any wobble, however small, in the     spinner, the bulkhead plate will suffer. I'd look for black dust on     the bulkhead and where it meets the spinner for a clue ..... on a     busted bulkhead.  The fact that this one has paint on it means it     will fit a little more snugly. 

     Some of the experimental guys lay some electrical tape on the     bulkhead flange to cushion the spinner.  Works on my Pitts.

     Linn

     

     On 9/1/2010 8:03 PM, flyv35b wrote:     [quote]              DIV { 	MARGIN: 0px }               I think this bulkhead is made of a different material because         it has laster longer than what I would expect.  That's all.  

        

       I think it's just the luck of the draw             due to spinner alignment and engine balance.

        

       Cliff

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flyv35b(at)minetfiber.com
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Posted: Thu Sep 02, 2010 5:25 am Post subject: Tiger forward spinner bulkhead

In addition, some of the spinners have holes that are  so elongated and oversize that the original precise location relative to the  back plate is in question.  Take a look sometime at the tip of the spinner  with the engine idling and you can see one that is precessing.  This puts a  centrifugal force on the bulkhead and stresses it.

  

 Cliff

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aa5_driver(at)YAHOO.COM
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Posted: Tue Sep 07, 2010 9:53 am Post subject: Tiger forward spinner bulkhead

$?

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teamgrumman(at)YAHOO.COM
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Posted: Tue Sep 07, 2010 10:44 am Post subject: Tiger forward spinner bulkhead

I don't have any.  You'll need to talk to Fletcher.



From: Airport Bum <aa5_driver(at)YAHOO.COM>

To: teamgrumman-list(at)matronics.com

Sent: Tue, September 7, 2010 10:48:30 AM

Subject: Re: Tiger forward spinner bulkhead



   



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