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Load in pod NOT same as wing lockers!

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a.s.elliott(at)cox.net
Guest

Posted: Fri Aug 17, 2007 6:15 am Post subject: Load in pod NOT same as wing lockers!

Folks:

  

 Please note that adding weight to your plane in a belly pod is absolutely  NOT the same as adding in the wing lockers.  

  

 For the same delta in gross, weight in the wings *reduces* the wing bending  moments while weight in the middle *increases* them.  That is why for most  aircraft with tip tanks, the weight of the fuel and tank at the tip is a  "freebie" on loading the plane.   Moving that same weight to the  middle will reduce the allowable G envelope accordingly.

  

 Andy Elliott, Mesa, AZ

N601GE (reserved)

601XL/TD/QB, Corvair,  building...

   [quote][b]

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PatrickW

Joined: 27 Oct 2006
Posts: 380
Location: Fort Worth, Texas

Posted: Sat Aug 18, 2007 8:00 am Post subject: Re: Load in pod NOT same as wing lockers!

Wouldn't the overall wing strength be compromised more by cutting the top skins for wing lockers than it would be if the top skins were left intact and 40 lbs were hung in the area someplace near the CG between the main gear and the firewall?



I thought the wing derived significant strength from it's skin?  



My wings are complete, except for final riveting of the top skins.  I have the wing locker option, but have not cut the skins at this time.  



The idea of leaving the skins intact for reasons of strength, and exploring external cargo storage options is an attractive idea.



Patrick

XL/Corvair

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leinad

Joined: 19 Sep 2006
Posts: 283
Location: Central Virginia

Posted: Sat Aug 18, 2007 8:27 am Post subject: Re: Load in pod NOT same as wing lockers!

Patrick,

I'm not an aeronautical engineer but part of my thinking on this issue was that the cut outs are mostly effecting the negative G strenght of wing since they are on top.  I'm going with with the wing lockers.

Dan



 	  Quote: 	
		  Wouldn't the overall wing strength be compromised more by cutting the top skins for wing lockers than it would be if the top skins were left intact and 40 lbs were hung in the area someplace near the CG between the main gear and the firewall? 



I thought the wing derived significant strength from it's skin? 



My wings are complete, except for final riveting of the top skins. I have the wing locker option, but have not cut the skins at this time. 



The idea of leaving the skins intact for reasons of strength, and exploring external cargo storage options is an attractive idea. 



Patrick 

XL/Corvair

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_________________
Scratch building XL with Corvair Engine

planecrazydld(at)yahoo.co
Guest

Posted: Sat Aug 18, 2007 8:51 am Post subject: Load in pod NOT same as wing lockers!

do not archive

   

  I suppose that you could always put the lockers in the most outboard bay, hten the only question would be the effect of a very hard landing when the lockers were at capacity weight.



PatrickW <pwhoyt(at)yahoo.com> wrote:

  [quote]--> Zenith-List message posted by: "PatrickW" 



Wouldn't the overall wing strength be compromised more by cutting the top skins for wing lockers than it would be if the top skins were left intact and 40 lbs were hung in the area someplace near the CG between the main gear and the firewall?



I thought the wing derived significant strength from it's skin? 



My wings are complete, except for final riveting of the top skins. I have the wing locker option, but have not cut the skins at this time. 



The idea of leaving the skins intact for  Downey

  Harleysville (SE) PA

  100 HP Corvair

  [quote][b]

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planecrazydld(at)yahoo.co
Guest

Posted: Sat Aug 18, 2007 8:51 am Post subject: Load in pod NOT same as wing lockers!

do not archive

   

  ...unless the failure mode is buckling...



leinad <leinad(at)hughes.net> wrote:

  [quote]--> Zenith-List message posted by: "leinad" 



Patrick,

I'm not an aeronautical engineer but part of my thinking on this issue was that the cut outs are mostly effecting the negative G strenght of wing since they are on top. I'm going with with the wing lockers.

Dan

[quote] Wouldn't the overall wing strength be compromised more by cutting the top skins for wing lockers than it would be if the top skins were left intact and 40 lbs were hung in the area someplace near the CG between the main gear and the firewall? 

 

 I thought the wing derived significant strength from it's skin? 

 

 My wings are complete, except for final riveting of the top skins.       Ready for the edge of your seat?    [quote][b]

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