---------------------------------------------------------- RVSouthEast-List Digest Archive --- Total Messages Posted Fri 10/03/08: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:34 AM - Re: RV8A Weight and balance (Craig Gallenbach) 2. 05:38 AM - Re: RV8A Weight and balance (lenleg@aol.com) 3. 05:42 AM - Re: RV8A Weight and balance (Craig Gallenbach) 4. 07:58 AM - Re: RV8A Weight and balance () ________________________________ Message 1 _____________________________________ Time: 05:34:04 AM PST US From: Craig Gallenbach Subject: RE: RVSouthEast-List: 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 aircra ft 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 pilo t and fuel on board.- If I measure my airplane, however I get different m easurements for wheel locations.- When I measure my wheel locations, I ge t 32.25 for the nosewheel and 92.75 for the mains.- The only difference i s that when-I made these measurements, the airplane was not level, but ra ther 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 wrote: From: Radomir Zaric Subject: RE: RVSouthEast-List: RV8A Weight and balance Craig, - I=92d double-check those numbers.. I seriously doubt you=92re that much off .. - Did you use these: - Main wheel right:------------------- --- 94.06=94 aft of Datum Main wheel left:------------------- ----- 94.06=94 aft of Datum Nose Wheel:--------------------- -------- 34.55=94 aft of Datum - - What was the weight distribution?- Can you post the numbers?- I also as sume 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 ab ove arms and I got 78.76=94 empty C.G at 1081 lbs=85. which is more in-line with what=92d be expected.. - Good luck.. Radomir - - - From: owner-rvsoutheast-list-server@matronics.com [mailto:owner-rvsoutheast -list-server@matronics.com] On Behalf Of Dale Ensing Sent: Thursday, October 02, 2008 7:44 PM Subject: Re: RVSouthEast-List: RV8A Weight and balance - Craig, Go here to see how you compare with other 8A. http://www.rvproject.com/wab/ Dale ----- Original Message ----- From: Craig Gallenbach 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 Su perior O-360 normally aspirated engine, Sensenich fixed pitch propeller, an d forward mounted lightweight battery.- The empty weight worked out to 10 80 lb with a CG at 74.8" (as measured using a datum 70" forward of the lead ing 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 acceptabl e CG with maximum or minimum fuel respectively.- Is this typical for an 8 A?- 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 - -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.matronic s.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 - - -http://www.matronics.com/Navigator?RVSouthEast-Listhttp://forums.matron ics.comhttp://www.matronics.com/contribution - ________________________________ Message 2 _____________________________________ Time: 05:38:41 AM PST US Subject: Re: RVSouthEast-List: RV8A Weight and balance From: lenleg@aol.com 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 -----Original Message----- From: Craig Gallenbach Sent: Thu, 2 Oct 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 ________________________________ Message 3 _____________________________________ Time: 05:42:06 AM PST US From: Craig Gallenbach Subject: Re: RVSouthEast-List: RV8A Weight and balance Dale, Thanks, that's a good reference tool.- My CG is considerably different th an the others. - Craig --- On Thu, 10/2/08, Dale Ensing wrote: From: Dale Ensing Subject: Re: RVSouthEast-List: RV8A Weight and balance Craig, Go here to see how you compare with other 8A. http://www.rvproject.com/wab/ Dale ----- Original Message ----- From: Craig Gallenbach 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 Su perior O-360 normally aspirated engine, Sensenich fixed pitch propeller, an d forward mounted lightweight battery.- The empty weight worked out to 10 80 lb with a CG at 74.8" (as measured using a datum 70" forward of the lead ing 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 acceptabl e CG with maximum or minimum fuel respectively.- Is this typical for an 8 A?- 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 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= 3D st-List"'>http://www.matronics.com/Navigator?RVSouthEast-List 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= 3D matronics.com 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= 3D ://www.matronics.com/contribution 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= 3D ________________________________ Message 4 _____________________________________ Time: 07:58:56 AM PST US From: Subject: RE: RVSouthEast-List: 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 wrote: > > 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 whenI 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rvsoutheast-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RVSouthEast-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rvsoutheast-list Browse Digests http://www.matronics.com/digest/rvsoutheast-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.