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Weight and balance

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Pat Reilly

Joined: 06 Aug 2009
Posts: 345

Posted: Tue Sep 22, 2009 7:59 am Post subject: Weight and balance

Kitfoxers, Can I use the Model 4 classic arm measurements for pilot, passenger, and wing tank fuel on my weight and balance sheet for my Model 3? Also, the fore and aft envelope of 10.2" and 16" of the classic 4, do those measurements apply to the model 3?

   

 Pat Reilly

 Mod 3 582 rebuild

 Rockford, IL  

  [quote][b]

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Wed Sep 23, 2009 12:57 am Post subject: Re: Weight and balance

PAt, I would have to look but I think the models 1 to 3 are a bit different than the IV model. Something tells me that is like 12 to 16 range. 



I got a model 2 manual in shop, will look and let you know

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Tom Jones

Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA

Posted: Wed Sep 23, 2009 6:23 am Post subject: Re: Weight and balance

 	  Quote: 	
		  Kitfoxers, Can I use the Model 4 classic arm measurementsï¿½for pilot, passenger, andï¿½wing tankï¿½fuel on myï¿½weight and balance sheet for my Model 3? Also, the fore and aft envelope of 10.2" and 16" of the classic 4, do those measurements apply to the model 3? 	




Pat, you should get someone with a model three to verify this information.  For what its worth, a weight and balance program I downloaded years ago from the old "Kitfox Builders" website uses the same arms for the models 3 and 4.  The forward CG limits are the same.  The Rear CG limit is different.  For the Model 3 this program lists 14.28 inches.



If I remember correctly, the old skystar factory did some additional testing on the Model 4 and increased the rear CG limit to 16 on the Model 4 only.



I'v always wondered if a person could do an empty weight and balance, then do several more weight and balance with a known weight at each of the loading locations, then run the math backwards to find the Arm for each location???

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_________________
Tom Jones
Classic IV
503 Rotax, 72 inch Two blade Warp
Ellensburg, WA

pchristensen10(at)austin.
Guest

Posted: Wed Sep 23, 2009 7:23 am Post subject: Weight and balance

PM me (at) pchristensen10 at Austin.rr.com.  I have a III weight and balance.



Pete



---

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Pat Reilly

Joined: 06 Aug 2009
Posts: 345

Posted: Wed Sep 23, 2009 11:17 am Post subject: Weight and balance

Dave, Thanks I think I have my question answered. If you find W&B on the 1thru 3 model I'd like to see the differences. do not archive

  

 Pat

 On Wed, Sep 23, 2009 at 3:57 AM, dave <dave(at)cfisher.com (dave(at)cfisher.com)> wrote:

 [quote]--> Kitfox-List message posted by: "dave" <dave(at)cfisher.com (dave(at)cfisher.com)>

 

PAt, I would have to look but I think the models 1 to 3 are a bit different than the IV model. Something tells me that is like 12 to 16 range.



I got a model 2 manual in shop, will look and let you know



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[b]

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Pat Reilly

Joined: 06 Aug 2009
Posts: 345

Posted: Wed Sep 23, 2009 11:18 am Post subject: Weight and balance

Tom, Thanks for reply. I since have found an explaination of computing the

CG envelope using mean avg cord of the wing. It was in my builders manual.

It also listed the Mod 4 forward cg as 10.2" which followed the formula of

20% of MAC. In addition it listed the rear CG as 16", 16" does not follow

the 28% of MAC. formula. The 14.28"is 28% of the 51" MAC. I had heard that

the factory had extented the rear CG after tests., and wondered if it also

applied to the model 3. Thanks again.



Pat Reilly

Mod 3 582 Rebuild

Rockford,IL

On Wed, Sep 23, 2009 at 9:23 AM, Tom Jones <nahsikhs(at)elltel.net> wrote:



[quote] 

 > Kitfoxers, Can I use the Model 4 classic arm measurementsï¿½for pilot,

 passenger, andï¿½wing tankï¿½fuel on myï¿½weight and balance sheet for my Model 3?

 Also, the fore and aft envelope of 10.2" and 16" of the classic 4, do those

 measurements apply to the model 3?

 Pat, you should get someone with a model three to verify this information

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