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SIMPLE Weight and Balance Spreadsheet

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Mike Welch

Joined: 13 Feb 2011
Posts: 272

Posted: Fri Aug 19, 2011 1:15 pm Post subject: SIMPLE Weight and Balance Spreadsheet

 	  Quote: 	
		  

Hi Pat,



  Here it is.  Hope you can use it ok.  (Boyd Young gets the credit for sharing it to the Kolb list)

Mike W





	


  	  Quote: 	
		  



On Aug 19, 2011, at 1:24 PM, Pat Ladd wrote:

 	  Quote: 	
		   If you want I could email you a really simple-to-use W & B spreadsheet >>

 

Yes please Mike.

 

my Xtra will be due for reweighing  as part of the Permit to Fly inspection next year and it would be helpful to be able to crunch some figures first.

 

Pat.        pj.ladd(at)btinternet ([email]pj.ladd(at)btinternet[/email])

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Kolb_Xtra_weight_and_balance_form__July_09.xls

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pj.ladd(at)btinternet.com
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Posted: Sat Aug 20, 2011 1:13 am Post subject: SIMPLE Weight and Balance Spreadsheet

re W and B.

  

 Thanks Mike

  

 When I have time I will put in the figures from my  last professional weighing onto the spread sheet and see how they work  out.

  

 Do you usually use the actual weight of the  pilot?  Here there is a standard allowance for W and B purposes and I think  that is placarded as a warning for you to do something about it if you are  outside the parameters.

  

  

 Thanks

  

 Pat

   [quote][b]

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Mike Welch

Joined: 13 Feb 2011
Posts: 272

Posted: Sat Aug 20, 2011 5:58 am Post subject: SIMPLE Weight and Balance Spreadsheet

Hi Pat,



  Regarding using 'actual' numbers, or that theoretical "170 lb" pilot and passenger, I did

several calculations.  Since it is so easy to swap out all kinds of weights and parameters, and 

the program does that number crunching for you, I did several weight samples.



  I found that a lone pilot, weighing that mythical 170 lbs, put the CG just slightly aft of center, of the

'25% to 35%' range...somewhere close to 31.1% aft of wing leading edge.  Next, I added a 

170 lb passenger, which then put the CG at 27.5%...evidently still in the acceptable limits of CG.

 

  Next, I put in my own weight (let's just say it's more than 170 lbs, not less).  Still within limits,

even if I add a passenger.  The "worst" calculation I got, which was me and a passenger, was 

something like 25.5% to 26%.



  I get the impression the MkIII is reasonably tolerant of pilot and passenger weights, as far as

staying within the CG boundaries goes.  Max gross is another matter.  At least the CG calculations 

make it seem so.



  I guess the MkIII Xtra has an even broader CG range does the MkIII C.  While discussing CG

stuff with a list member who has recently started flying his finished Xtra, he says his Xtra manual

says CG can be within 20% to 35% aft of wing leading edge, if I recall correctly.  I don't have an

Xtra builder's manual, only the MkIII manual.  I guess the Xtra has an even broader CG range than 

it's predecessor.



  I'm sure someone with lots of MkIII time, (especially with a passenger) will share their thoughts.... 



Mike Welch

N212MN

          re W and B.

   Thanks Mike

   When I have time I will put in the figures from my  last professional weighing onto the spread sheet and see how they work  out.

   Do you usually use the actual weight of the  pilot?  Here there is a standard allowance for W and B purposes and I think  that is placarded as a warning for you to do something about it if you are  outside the parameters.

  

Thanks  

 Pat

   [quote]

[b]

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