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RV8A Weight and balance

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craigtxtx(at)yahoo.com
Guest

Posted: Thu Oct 02, 2008 2:56 pm Post subject: RV8A Weight and balance

I weighed my RV8A and was somewhat surprised at the results.  I have a Superior O-360 normally aspirated engine, Sensenich fixed pitch propeller, and forward mounted lightweight battery.  The empty weight worked out to 1080 lb with a CG at 74.8" (as measured using a datum 70" forward of the leading edge).  With only the pilot (220 lb) on board, I need between 20 and 30 lb of ballast in the rear baggage compartment to be within the acceptable CG with maximum or minimum fuel respectively.  Is this typical for an 8A?  With a fixed pitch propeller and lightweight battery I was expecting to be not quite so nose heavy.  Have others had similar results?

  

 Thanks in advance for your help.

  

 Craig Gallenbach

 RV8A, N184CG  ........ almost ready to fly

 [quote][b]

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Dale Ensing

Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC

Posted: Thu Oct 02, 2008 3:45 pm Post subject: RV8A Weight and balance

Craig, Go here to see how you compare with other  8A.

 http://www.rvproject.com/wab/

 Dale

 [quote]   ---

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_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC

vitez(at)carolina.rr.com
Guest

Posted: Thu Oct 02, 2008 4:06 pm Post subject: RV8A Weight and balance

Craig,  

   

I’d double-check those numbers.. I seriously doubt you’re that much off..   

   

Did you use these:  

   

Main wheel right:                       94.06” aft of Datum  

Main wheel left:                         94.06” aft of Datum  

Nose Wheel:                              34.55” aft of Datum  

   

   

What was the weight distribution?  Can you post the numbers?  I also assume the plane was weighted longerons leveled w/ closed canopy etc etc..   

   

Maybe this spreadsheet would help:  

   

http://www.rv8a.com/downloads/RV-W&B.xls  

   

   

PS.. Just for fun, I used my numbers for weight on each wheel, using the above arms and I got 78.76” empty C.G at 1081 lbs…. which is more in-line with what’d be expected..   

   

Good luck..  

Radomir  

   

   

       

From: owner-rvsoutheast-list-server(at)matronics.com [mailto:owner-rvsoutheast-list-server(at)matronics.com] On Behalf Of Dale Ensing

 Sent: Thursday, October 02, 2008 7:44 PM

 To: rvsoutheast-list(at)matronics.com

 Subject: Re: RV8A Weight and balance  

  

  

     

Craig, Go here to see how you compare with other 8A.  

    

http://www.rvproject.com/wab/  

    

Dale  

   	  Quote: 	
		      

----- Original Message -----   

    

From: Craig Gallenbach (craigtxtx(at)yahoo.com)   

    

To: RV list (rv-list(at)matronics.com) ; SERV (rvsoutheast-list(at)matronics.com)   

    

Sent: Thursday, October 02, 2008 6:56 PM  

    

Subject: RVSouthEast-List: RV8A Weight and balance  

    

   

             

I weighed my RV8A and was somewhat surprised at the   results.  I have a Superior O-360 normally aspirated engine, Sensenich   fixed pitch propeller, and forward mounted lightweight battery.  The   empty weight worked out to 1080 lb with a CG at 74.8" (as measured using   a datum 70" forward of the leading edge).  With only the pilot (220   lb) on board, I need between 20 and 30 lb of ballast in the rear baggage   compartment to be within the acceptable CG with maximum or minimum fuel   respectively.  Is this typical for an 8A?  With a fixed pitch   propeller and lightweight battery I was expecting to be not quite so nose   heavy.  Have others had similar results?   

      

    

      

Thanks in advance for your help.   

      

    

      

Craig Gallenbach   

      

RV8A, N184CG  ........ almost ready to fly   

         	  Quote: 	
		    3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3Dst-List"'>http://www.matronics.com/Navigator?RVSouthEast-List3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3Dmatronics.com3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D://www.matronics.com/contribution3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 	
 	
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9

       [quote][b]

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bill(at)repucci.com
Guest

Posted: Thu Oct 02, 2008 4:46 pm Post subject: RV8A Weight and balance

Craig,  

   

One other question, was your -8A level, both fore and aft as well as left and right, when you weighed it?  

   

Bill  

       

From: owner-rvsoutheast-list-server(at)matronics.com [mailto:owner-rvsoutheast-list-server(at)matronics.com] On Behalf Of Radomir Zaric

 Sent: Thursday, October 02, 2008 8:06 PM

 To: rvsoutheast-list(at)matronics.com

 Subject: RE: RV8A Weight and balance  

  

  

   

Craig,  

   

I’d double-check those numbers.. I seriously doubt you’re that much off..   

   

Did you use these:  

   

Main wheel right:                       94.06” aft of Datum  

Main wheel left:                         94.06” aft of Datum  

Nose Wheel:                              34.55” aft of Datum  

   

   

What was the weight distribution?  Can you post the numbers?  I also assume the plane was weighted longerons leveled w/ closed canopy etc etc..   

   

Maybe this spreadsheet would help:  

   

http://www.rv8a.com/downloads/RV-W&B.xls  

   

   

PS.. Just for fun, I used my numbers for weight on each wheel, using the above arms and I got 78.76” empty C.G at 1081 lbs…. which is more in-line with what’d be expected..   

   

Good luck..  

Radomir  

   

   

       

From: owner-rvsoutheast-list-server(at)matronics.com [mailto:owner-rvsoutheast-list-server(at)matronics.com] On Behalf Of Dale Ensing

 Sent: Thursday, October 02, 2008 7:44 PM

 To: rvsoutheast-list(at)matronics.com

 Subject: Re: RV8A Weight and balance  

  

  

     

Craig, Go here to see how you compare with other 8A.  

    

http://www.rvproject.com/wab/  

    

Dale  

   	  Quote: 	
		      

----- Original Message -----   

    

From: Craig Gallenbach (craigtxtx(at)yahoo.com)   

    

To: RV list (rv-list(at)matronics.com) ; SERV (rvsoutheast-list(at)matronics.com)   

    

Sent: Thursday, October 02, 2008 6:56 PM  

    

Subject: RVSouthEast-List: RV8A Weight and balance  

    

   

             

I weighed my RV8A and was somewhat surprised at the   results.  I have a Superior O-360 normally aspirated engine, Sensenich   fixed pitch propeller, and forward mounted lightweight battery.  The   empty weight worked out to 1080 lb with a CG at 74.8" (as measured using   a datum 70" forward of the leading edge).  With only the pilot (220   lb) on board, I need between 20 and 30 lb of ballast in the rear baggage   compartment to be within the acceptable CG with maximum or minimum fuel   respectively.  Is this typical for an 8A?  With a fixed pitch   propeller and lightweight battery I was expecting to be not quite so nose   heavy.  Have others had similar results?   

      

    

      

Thanks in advance for your help.   

      

    

      

Craig Gallenbach   

      

RV8A, N184CG  ........ almost ready to fly   

         	  Quote: 	
		    3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3Dst-List"'>http://www.matronics.com/Navigator?RVSouthEast-List3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3Dmatronics.com3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D://www.matronics.com/contribution3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 	
 	
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       [quote][b]

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craigtxtx(at)yahoo.com
Guest

Posted: Fri Oct 03, 2008 4:34 am Post subject: RV8A Weight and balance

Radomir,

  

 My weights were:

  

 Nose wheel:  321

 Right wheel:  381

 Left wheel:  379

  

 I weighed the airplane level to within 0.1 degree and used a digital aircraft scale so I'm pretty confident of the weights.

  

 If I use the distance measurements shown on one of Van's examples (the ones in your note) I come up with an empty CG of 76.4 and all is well with pilot and fuel on board.  If I measure my airplane, however I get different measurements for wheel locations.  When I measure my wheel locations, I get 32.25 for the nosewheel and 92.75 for the mains.  The only difference is that when I made these measurements, the airplane was not level, but rather with all wheels on the ground.  That might make a difference, but I didn't think it would be that much.  

  

 Craig



--- On Thu, 10/2/08, Radomir Zaric <vitez(at)carolina.rr.com> wrote:



 [quote]From: Radomir Zaric <vitez(at)carolina.rr.com>

Subject: RE: RV8A Weight and balance

To: rvsoutheast-list(at)matronics.com

Date: Thursday, October 2, 2008, 7:05 PM



       

Craig,



 

 



 

I’d double-check those numbers.. I seriously doubt you’re that much off..  

   

Did you use these:  

   

Main wheel right:                       94.06” aft of Datum  

Main wheel left:                         94.06” aft of Datum  

Nose Wheel:                              34.55” aft of Datum  

   

   

What was the weight distribution?  Can you post the numbers?  I also assume the plane was weighted longerons leveled w/ closed canopy etc etc..  

   

Maybe this spreadsheet would help:  

   

http://www.rv8a.com/downloads/RV-W&B.xls  

   

   

PS.. Just for fun, I used my numbers for weight on each wheel, using the above arms and I got 78.76” empty C.G at 1081 lbs…. which is more in-line with what’d be expected..  

   

Good luck..  

Radomir  

   

   

     

From: owner-rvsoutheast-list-server(at)matronics.com [mailto:owner-rvsoutheast-list-server(at)matronics.com] On Behalf Of Dale Ensing

Sent: Thursday, October 02, 2008 7:44 PM

To: rvsoutheast-list(at)matronics.com

Subject: Re: RV8A Weight and balance

 

    

Craig, Go here to see how you compare with other 8A.



  

http://www.rvproject.com/wab/



  

Dale



 [quote]  

---

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lenleg(at)aol.com
Guest

Posted: Fri Oct 03, 2008 4:38 am Post subject: RV8A Weight and balance

Craig:

 

 Glad to hear you are so far along.  I fly with an 18 lb. tool bag on my rear shelf to compensate for a heavy nose.  I have a CS prop so that adds weight up front.  

 

 Good lluck !

 

 Len

 

   

 

   

 

 --

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craigtxtx(at)yahoo.com
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Posted: Fri Oct 03, 2008 4:42 am Post subject: RV8A Weight and balance

Dale,

 Thanks, that's a good reference tool.  My CG is considerably different than the others.

  

 Craig

 



--- On Thu, 10/2/08, Dale Ensing <densing(at)carolina.rr.com> wrote:



 [quote]From: Dale Ensing <densing(at)carolina.rr.com>

Subject: Re: RV8A Weight and balance

To: rvsoutheast-list(at)matronics.com

Date: Thursday, October 2, 2008, 6:43 PM



    Craig, Go here to see how you compare with other 8A.

 http://www.rvproject.com/wab/

 Dale

 [quote] ---

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vitez(at)carolina.rr.com
Guest

Posted: Fri Oct 03, 2008 6:58 am Post subject: RV8A Weight and balance

I'd use Van's arm numbers.  It looks like the arm measurements you got may not be "correct." They're significantly off, but they're also consistent which tells me there's really no problem -- just a measuring difference (eg measured to a different point on wheel etc..)

Even with the best of effort, I doubt you built all your wheels 2 inches forward than everybody else   It's (mostly) prepunched kit, right?



Looks like you're in good shape... sounds like first flight is just around the corner 

Good luck!

Radomir





---- Craig Gallenbach <craigtxtx(at)yahoo.com> wrote: 

 	  Quote: 	
		   

 Radomir,

 Â 

 My weights were:

 Â 

 Nose wheel:Â  321

 Right wheel:Â  381

 Left wheel:Â  379

 Â 

 I weighed the airplane level to within 0.1 degree and used a digital aircraft scale so I'm pretty confident of the weights.

 Â 

 If I use the distance measurements shown on one of Van's examples (the ones in your note) I come up with an empty CG of 76.4 and all is well with pilot and fuel on board.Â  If I measure my airplane, however I get different measurements for wheel locations.Â  When I measure my wheel locations, I get 32.25 for the nosewheel and 92.75 for the mains.Â  The only difference is that whenÂ I made these measurements, the airplane was not level, but rather with all wheels on the ground.Â  That might make a difference, but I didn't think it would be that much.Â  

 Â 

 Craig

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