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Tail Post supports

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elleryweld(at)aol.com
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Posted: Sat Aug 18, 2012 5:38 pm Post subject: Tail Post supports

here is a PIC of the tail post supports that I think John Hauck came up with the tail wheel is much better than that Pizza cutter  and it does make it handle more like a tail dragger 

   

  

   [img]cid:tie_8CF4BC1F90C18F8_1794_9D6ED[/img]

  

 

 

  

    Ellery Batchelder Jr.

 

  

  

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Dennis Thate

Joined: 18 Nov 2010
Posts: 362

Posted: Sun Aug 19, 2012 3:52 am Post subject: Re: Tail Post supports

Thanks for the photo Ellery.



I beefed up to a thicker aluminum wall tubing and a larger and thicker  steel welded gusset and it's all covered up......

 I've put it to the test and it seems to have done the trick.

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Both optimists and pessimists contribute to our society. The optimist invents the airplane and the pessimist the parachute. ~Gil Stern

elleryweld(at)aol.com
Guest

Posted: Sun Aug 19, 2012 11:22 am Post subject: Tail Post supports

in your pic you dont have the supports that show in my pic, thicker aluminum tubing will not help the area of failure you had better take another look at my pic the supports I am talking about are attached to the big Ring that slips over the end of the tail boom tube under the elevators attachment points and attach to the bottom tube that your tail wheel rod slides into this will help this vertical Tube from breaking under side load pressure 

  

    Ellery Batchelder Jr.

 

  

  

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Dennis Thate

Joined: 18 Nov 2010
Posts: 362

Posted: Sun Aug 19, 2012 1:30 pm Post subject: Re: Tail Post supports

Ellery,



I respectfully disagree. The non-turnable Pizza Cutter tail wheel puts a side torque on the lower tail-fin midway, so when forced into a tight turn, it will break, where as a swivel wheel eliminates this problem.



Take note where mine broke in two places. I don't believe your concept would offer any solution to this, because you are reinforcing it in the wrong location.



Hope this photo helps clarify things.

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neilsenrm(at)gmail.com
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Posted: Sun Aug 19, 2012 5:32 pm Post subject: Tail Post supports

Dennis



I have never seen that kind of breakage. I have to ask if plane was built to specifications. My MKIIIC has a fairly strong  .125 wall bottom tube that has in most Kolbs kept that kind of breakage from happening. Normally we see side loads causing the problems Ellery has described the fix for. I have had the turning bogie wheel and now the locking/swivel tail wheel on my MKIIIC both of these wheels can produce the side loads that can cause long term failure of the tail post without the fix.

 



Rick Neilsen

Redrive VW Powered MKIIIC

 



On Sun, Aug 19, 2012 at 5:30 PM, Dennis Thate <retroman(at)frontier.com (retroman(at)frontier.com)> wrote:

 [quote]--> Kolb-List message posted by: "Dennis Thate" <retroman(at)frontier.com (retroman(at)frontier.com)>

  

 Ellery,

 

 I respectfully disagree. The non-turnable Pizza Cutter tail wheel puts a side torque on the lower tail-fin midway, so when forced into a tight turn, it will break, where as a swivel wheel eliminates this problem.

 

 Take note where mine broke in two places. I don't believe your concept would offer any solution to this, because you are reinforcing it in the wrong location.

 

 Hope this photo helps clarify things.

 

 --------

 Both optimists and pessimists contribute to our society.  The optimist invents the airplane and the pessimist the parachute.  ~Gil Stern

 

 

 

 

 Read this topic online here:

 

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elleryweld(at)aol.com
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Posted: Sun Aug 19, 2012 6:09 pm Post subject: Tail Post supports

Thank You Rick I have just repaired my  second Tail post on a different kolb in the same place  and this is no longer a problem area with the side load supports just my experience  but results may differ from other views

  

    Ellery Batchelder Jr.

 

  

  

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Aug 19, 2012 6:47 pm Post subject: Tail Post supports

Thank You Rick I have just repaired my  second Tail post on

a different kolb in the same place  and this is no longer a

problem area with the side load supports just my experience 

but results may differ from other views

Ellery Batchelder Jr.

 

Kolbers:



We can thank Dan Horton, one of my flying buddies, for

coming up with the tail post fix.  Can't remember how many

times we repaired and modified my mkIII tail post until Dan

came up with the idea of adding external bracing.  Haven't

had any problem with mine since.



john h

mkIII

Sargents, Colorado

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

zeprep251(at)aol.com
Guest

Posted: Mon Aug 20, 2012 5:38 am Post subject: Tail Post supports

Rick,

 My FS broke the lower aluminum tube flush with the steel just like the picture.I reinforced it using a thicker tube and months later it broke at the steel tube up by the ring as in the photo.If you just push on the top of the tail post you can quickly identify the side loads that affect these tubes even WITH a swivel tail wheel.I am a believer in these braces but It looks like no one but me feels that way about the tail spring clamp.

 IMHO G.Aman MK3C jabiru 2200A 740hrs

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