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Tailplane design

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n914va(at)bvunet.net
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Posted: Fri Jun 29, 2007 6:45 am Post subject: Tailplane design

The person that started my kit did not have faith  in the tail plane design, nor do I. He designed and built a pinned clamping  system that fits inside the fuselage that would prevent any play from developing  due to wear. I don't feel that the retention between TP-4 and Tp-6 tubes to  be adequate because of the thin wall. If any play at all was present at  assembly, it seems that the slight movement would increase the size of the holes  to where it became excessive. I've attached a PDF file ofwhat I would like to do  to change it, but am not sure that it can be done with 100% realiability. Maybe  there are some engineers out there that can. The 3/8" modification has not been  done, so the idea of drilling out slightly smaller than 3/8" and driving  increasingly larger pins through to expand the holes to 3/8" while work  hardening them seems to be my other recourse. BTW, my old Sears garden tractor  used the same method of attaching the front axle to the frame as the present  system of a pin through thin walled metal and assembly that had worn  so badly in one year that it was hard to steer and impossible to mow evenly. I  took the axle off and had a tube welded in it and collars welded to the frame  and was able to get 8 years of satifactory service from it until the motor gave  up.

  

 I have pictures of the clamp collars made and  installed in my kit by the previous builder if anyone is  interested.

  

 Vaughn Teegarden

 N914VA - no  progress

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Brian Davies

Joined: 10 Jan 2006
Posts: 124
Location: uk

Posted: Fri Jun 29, 2007 8:14 am Post subject: Tailplane design

Vaughn,

  

 Are you sure you mean TP6 retention?  My understanding  is that a tight fit at TP6 is not desireable because it can transfer loads to  TP6 if there is play at other points in the sytem and this can lead to TP6  disbonding from the tail plane.

  

 Your method may be more appropriate at the TP12/ TP14  locations, which is, I suspect what you really meant.

  

 Regards

  

 Brian Davies



   From: owner-europa-list-server(at)matronics.com  [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Europa  List

Sent: 29 June 2007 15:45

To:  europa-list(at)matronics.com

Subject: Tailplane  design

 

  The person that started my kit did not have faith  in the tail plane design, nor do I. He designed and built a pinned clamping  system that fits inside the fuselage that would prevent any play from developing  due to wear. I don't feel that the retention between TP-4 and Tp-6 tubes to  be adequate because of the thin wall. If any play at all was present at  assembly, it seems that the slight movement would increase the size of the holes  to where it became excessive. I've attached a PDF file ofwhat I would like to do  to change it, but am not sure that it can be done with 100% realiability. Maybe  there are some engineers out there that can. The 3/8" modification has not been  done, so the idea of drilling out slightly smaller than 3/8" and driving  increasingly larger pins through to expand the holes to 3/8" while work  hardening them seems to be my other recourse. BTW, my old Sears garden tractor  used the same method of attaching the front axle to the frame as the present  system of a pin through thin walled metal and assembly that had worn  so badly in one year that it was hard to steer and impossible to mow evenly. I  took the axle off and had a tube welded in it and collars welded to the frame  and was able to get 8 years of satifactory service from it until the motor gave  up.

  

 I have pictures of the clamp collars made and  installed in my kit by the previous builder if anyone is  interested.

  

 Vaughn Teegarden

 N914VA - no progress

 AVG Free  Date:  28/06/2007 17:57

 

 

  28/06/2007 17:57

     [quote][b]

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n914va(at)bvunet.net
Guest

Posted: Fri Jun 29, 2007 9:14 am Post subject: Tailplane design

No Brian, I was off on a stupid binge which was  thankfully stopped by your comment. Never mind. Sometimes too much thinking  leads me to fruitless thinking and time wasted on my part. 

  

 N914VA

 [quote]   ---

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tonywickens(at)btconnect.
Guest

Posted: Fri Jun 29, 2007 4:51 pm Post subject: Tailplane design

Vaughn

 It would certainly have more bearing surface which  is good but if you do mean TP12 how would you get it through the TP11  bearing?

 Tony

 [quote]   ---

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n914va(at)bvunet.net
Guest

Posted: Fri Jun 29, 2007 7:03 pm Post subject: Tailplane design

No, I was refering to TP-4 And TP-6, but I was  totally wrong in my thinking. Ther is no need to even continue the discussion. I  am embarassed by my stupidity at times, this being one of them.

 Vaughn

  

 ---

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grahamsingleton(at)btinte
Guest

Posted: Sat Jun 30, 2007 3:45 am Post subject: Tailplane design

Vaughn

the most stupid thing is to refuse to acknowledge mistakes, the man who 

never made a mistake never made anything

Graham



Europa List wrote:

[quote] No, I was refering to TP-4 And TP-6, but I was totally wrong in my 

 thinking. Ther is no need to even continue the discussion. I am 

 embarassed by my stupidity at times, this being one of them.

 Vaughn

  

 ---

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n914va(at)bvunet.net
Guest

Posted: Sat Jun 30, 2007 6:06 am Post subject: Tailplane design

Graham,

Thanks for the kind words. It's funny how a forum member's short sentence 

can turn on the light in my dimly lit, cobwebbed mind. Making the mistakes 

on the forum is preferable to making them on the aircraft. The forum is 

indeed a valuable resource.



Vaughn



---

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