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701 CG calculations

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Chris Harding

Joined: 26 Jan 2006
Posts: 8

Posted: Tue Apr 25, 2006 6:32 am Post subject: 701 CG calculations

When calculating your operating CG, what values do you use for the moment arms for the pilot/pax, fuel and baggage positions?



I can’t find anything in the builder’s manuals that came with my 701.



Over the phone, ZAC quoted 0.6m (23.6 inches) aft of the slat l.e. for both the pilot/pax and fuel positions (I forgot to ask about the baggage shelf) – this seems a bit high to me.



Chris

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mgraves(at)usmo.com
Guest

Posted: Tue Apr 25, 2006 7:35 am Post subject: 701 CG calculations

At the bottom of this web link is a   Weight and Balance calculations  in 

PDF format



http://www.zenithair.com/stolch701/7dwg-updates.html



At 07:32 AM 4/25/2006 -0700, you wrote:

 	  Quote: 	
		  



When calculating your operating CG, what values do you use for the moment 

arms for the pilot/pax, fuel and baggage positions?



I cant find anything in the builders manuals that came with my 701.



Over the phone, ZAC quoted 0.6m (23.6 inches) aft of the slat l.e. for 

both the pilot/pax and fuel positions (I forgot to ask about the baggage 

shelf)  this seems a bit high to me.



Chris





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=30549#30549

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Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Tue Apr 25, 2006 7:41 am Post subject: Re: 701 CG calculations

This ought to help and was available in the builders area of the Zenith web site.



http://www.zenithair.com/stolch701/data/w&b-701.pdf



 	  Chris Harding wrote: 	
		  When calculating your operating CG, what values do you use for the moment arms for the pilot/pax, fuel and baggage positions?



I can’t find anything in the builder’s manuals that came with my 701.



Over the phone, ZAC quoted 0.6m (23.6 inches) aft of the slat l.e. for both the pilot/pax and fuel positions (I forgot to ask about the baggage shelf) – this seems a bit high to me.



Chris

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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR

cffd(at)pgrb.com
Guest

Posted: Tue Apr 25, 2006 8:19 am Post subject: 701 CG calculations

Chris

I actually weighed my 701 with me in the pilot seat and with the seat empty.

 	  Quote: 	
		  From this I derived the cg of the pilot (which will be the same for the

passenger).

I measured the shape and location of the wing fuel tanks to determine the cg

of the fuel.  The tanks themselves were included when weighing the airplane

itself.

The datum point is the leading edge of the slat.

Pilot cg is .637 meters aft of the datum (ZAC says .6 meters)

My 10 gal wing fuel tanks (actually 10.8 gal) are .656 meters aft (ZAC shows

.5 meters aft but that may be for the smaller wing tanks)

I used ZAC's luggage number of 1.05 meters aft.

Chuck D.

N701TX

 	  Quote: 	
		   Chris Harding wrote:

 > When calculating your operating CG, what values do you use for the

moment arms for the pilot/pax, fuel and baggage positions?

 	  Quote: 	
		   >

 > I cant find anything in the builders manuals that came with my 701.

 >

 > Over the phone, ZAC quoted 0.6m (23.6 inches) aft of the slat l.e. for

both the pilot/pax and fuel positions (I forgot to ask about the baggage

shelf)  this seems a bit high to me.

 	  Quote: 	
		   >

 > Chris

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Chris Harding

Joined: 26 Jan 2006
Posts: 8

Posted: Tue Apr 25, 2006 6:11 pm Post subject: Re: 701 CG calculations

Many thanks to everyone for their assistance.  I think I may well go with Chuck's (more conservative) figures for fuel and pilot/pax until I can do the same as him and weigh the airplane with and without me and fuel in it.



Chris

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steveadams

Joined: 10 Jan 2006
Posts: 191

Posted: Wed Apr 26, 2006 3:57 am Post subject: Re: 701 CG calculations

For the fuel arm I would use ZACs numbers. For pilot, passenger, and baggage areas, use a tape measure and measure the arms on your plane. It's not really all that complicated. Measurements to the mm are really beyond what is needed.

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