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Horizontal stabilizer mounting

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mdnanwelch7(at)hotmail.co
Guest

Posted: Mon Mar 24, 2008 7:06 am Post subject: Horizontal stabilizer mounting

Mike B.

  

   I just went back and examined your modification to the hor. stab. mount.

 OH MY GOD!!!  You used aluminum (!!!) to relocate that position!!  And you had to 

 notch it, to boot.  I would red tag your plane immediately, if I was an FAA inspector!!

  

   If one of those aluminum straps let go, it would place an enormous amount of twisting 

 force on on the one remaining, with a likely failure of the second one almost instantaneous.

 You have been lucky so far, don't push your luck any further.

  

   The very LEAST you should have done is make the extension out of 1/8" 4130 chromoly!!

 However, it is my opinion you wings are NOT set correctly, and this required an "odd"

 hor. stab. setting is the result.

  

   You need to set your wings correctly, to within a gnat's ass of perfect, THEN reset the 

 hor. stab. to recommended position.

  

   I did a lot of research recently regarding setting up the wings the MkIII (both Classic and Xtra)

 With my nose redesign on my MkIII I knew this would adversely affect the present position of

 my current and older incidence setting.  I would highly recommend you do your own research

 to resolve your situation.

  

   And, for God's sake, don't fly that sucker until you get it right!! (and get those aluminum straps

 off!!

  

  

 Mike Welch

In a rush? Get real-time answers with Windows Live Messenger.  [quote][b]

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travis(at)tnkolbaircraft.
Guest

Posted: Mon Mar 24, 2008 7:44 am Post subject: Horizontal stabilizer mounting

Mike W:

  

 Maybe you need to do some more research.

  

 I'm willing to bet the wing incidence is set correctly on  Mike B's X.  Bryan Melborne built his airplane.

  

 BTW:  I fly with factory wing incidence, but have  dropped the leading edge of my horizontal stabilizer.  Been flying this way  since day one, with some experimentation up and down, until I found the "sweet  spot".  Once I found that, no further experimentation needed.

  

 john h

 mkIII

 Labhart Field, KY

 [quote]      You    need to set your wings correctly, to within a gnat's ass of perfect, THEN    reset the 

hor. stab. to    recommended position.

 

  I did a lot of research    recently regarding setting up the wings the MkIII (both Classic and    Xtra)

With my nose redesign on my MkIII I knew this would adversely affect    the present position of

my current and older incidence setting.  I    would highly recommend you do your own research

to resolve your    situation.

  

Mike  Welch



 

[b]

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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Mon Mar 24, 2008 7:59 am Post subject: Re: Horizontal stabilizer mounting

Mike,



Thanks for your concern and warning, but those are thicker and stronger than they look in the picture.   The extensions are not straps, are 3/8 inch thick aluminum blocks and made out of 6061-T6 aluminum.   They are are much stronger than the tab that sticks out of the horizontal stab and attaches to them ( Which is loaded a bending force ).  If one of the aluminum blocks broke, the one remaining would not only hold, it would still be stronger than the small 4130 tab that comes out of the horizontal stab.



I considered using the same 1/8 inch 4130 steel that the original tabs are made out of, but the aluminum is corrosion proof,and at 3/8 inch thick is much stiffer and stronger.



4130 ChomMoly Tensile Strength = 90,000 PSI

6061-T6 Aluminum Tensile Strength = 45,000 PSI



Considering that the aluminum block is 3 times as thick as the 4130 steel they are attached to, I calculate it at 50 % stronger.  Overkill, but I like strong  



I do thank you for the warning though, I would rather have to recalculate and rethink a structural component than have something break on me on the very slim chance that I made a mistake    



Mike

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