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craig(at)craigandjean.com
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 Posted: Thu Aug 23, 2007 8:35 am Post subject: weight & balance with one scale? |
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Don't do what I did - I bought three cheap digital electronic scales at
Costco. Problem is that they are designed to turn on when you step on them
and will turn off after a short period. Hard to do when weighing a plane so
I returned them.
-- Craig
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Thu Aug 23, 2007 10:31 am Post subject: Re: weight & balance with one scale? |
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Ok her's the plan. Go to Wal-Mart or Home Depot and get 3 of the best analog scales you can find.
Then go do the weight and balance and then return the scales. Here's the clincher. Tell them they didn't go high enough for your wife to use.
I'll bet they hand you your money back and not say a word.
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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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amyvega2005(at)earthlink.
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| Posted: Thu Aug 23, 2007 2:16 pm Post subject: weight & balance with one scale? |
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Gig,
i am in the process of getting ready for weight and bal as well. when you do the three scals, do you take the average of the three? hows that work? I have the work sheets with the arms but the weight things i am needing of some pip slapping to understand.
Juan
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Thu Aug 23, 2007 4:10 pm Post subject: weight & balance with one scale? |
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1. Add the three weights to get the total empty weight.
2. Multiply each individual weight by its distance behind the datum.
4. Add the three products.
5. Divide this sum by the empty weight to get the distance behind the
datum of the CG.
Juan Vega wrote:
[quote]
Gig,
i am in the process of getting ready for weight and bal as well. when you do the three scals, do you take the average of the three? hows that work? I have the work sheets with the arms but the weight things i am needing of some pip slapping to understand.
Juan
--
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_________________
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Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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dredmoody(at)cox.net
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| Posted: Fri Aug 24, 2007 5:52 am Post subject: weight & balance with one scale? |
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Averaging only enters in if you decide to do three weighings rotating the scales each time. You just need to know a reliable weight for each main and for the nosewheel, empty of fuel and non-essential gadgets with the plane as level as possible (upper longerons are the reference) and no sideways stress on the wheels. Then plug the figures into the W&B formula, assuming you already have that.
Does that help any?
Dred
---- Juan Vega <amyvega2005(at)earthlink.net> wrote:
[quote]
Gig,
i am in the process of getting ready for weight and bal as well. when you do the three scals, do you take the average of the three? hows that work? I have the work sheets with the arms but the weight things i am needing of some pip slapping to understand.
Juan
--
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amyvega2005(at)earthlink.
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| Posted: Fri Aug 24, 2007 6:05 am Post subject: weight & balance with one scale? |
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yep, awesome thanx.
juan
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