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Looking For W&B Using Arm Instead of Moment



 
 
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  #1  
Old October 30th 03, 06:18 PM
John T
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Thanks, folks.

While I'll grant you that my math skills aren't nearly as polished as my
piloting skills, I did know that "weight * arm = moment".

The item I was looking for (included in Ron's helpful link) was a CG
envelope (thanks to Jose for the correct term) using arm instead of moment.
As I said, all the envelopes in the POHs I've used for the planes I've flown
have all used moment - not arm - in the graphical representation.

After seeing the graphic from Ron's link, I realize that I've seen similar
charts - just not in any of the POHs I've used.

Thanks again!

--
John T
http://tknowlogy.com/tknoFlyer
__________



  #2  
Old October 30th 03, 07:03 PM
Jim Weir
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And not to belabor the point, what John wanted (and finally found) was the
good-old-days CG "box" instead of the dumbed-down parallelogram that Cessna
foisted on us starting around 1960. Seems that some marketing genius thought
that the flying public was too stupid to do a "real" weight and balance by doing
the multipication of weight*arm, adding the moments, and dividing by the total
weight to get the point of balance.

I started flying in '64, and it wasn't until I went for my A&P in '70 that I
ever saw (or used, for that matter) the good old box style CG method of
calculation.

Jim



"John T"
shared these priceless pearls of wisdom:

-Thanks, folks.



Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com
 




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