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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA
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 Posted: Fri Apr 09, 2010 4:21 pm Post subject: Weight & Balance Spreadsheet |
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Dear Listers,
I finally weighted the 'ol RV-8 last night. Gulp. As expected, pretty heavy. I did forget to fill it up with oil before I weighed, however, so I'll have to redo my weighing after I do that.
In the meantime, I created a spreadsheet to calculate the Weight & Balance. The sheet calculates a number of common scenarios and allows for the user-entering of various parameters such as pilot weight and plane weights as well as the various arms. Its setup for an RV-8, but could very easily be modified for other models of RVs. After I finished it, I thought other builders might like to use it as well. It comes with no guarantees whatsoever.
You can click on the link below to download either the PDF or the Excel spreadsheet:
PDF Format:
http://www.matronics.com/MattsRV8/WeightAndBalance/RV-8WeightAndBalance-Version1.0-MattDralle.pdf
Excel Format:
http://www.matronics.com/MattsRV8/WeightAndBalance/RV-8WeightAndBalance-Version1.0-MattDralle.xls
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
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Matt Dralle
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rv8builder
Joined: 02 Jan 2009
Posts: 56
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| Posted: Sat Apr 10, 2010 2:40 am Post subject: Weight & Balance Spreadsheet |
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Why re-weight it? If you know the weight of the oil and the arm of
the oil sump, just do the math. IMHO.
Dale
On Fri, Apr 9, 2010 at 8:20 PM, Matt Dralle <dralle(at)matronics.com> wrote:
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Gary.A.Sobek
Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA
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| Posted: Sat Apr 10, 2010 6:30 am Post subject: Weight & Balance Spreadsheet |
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Matt:
Great spreadsheet for your use and education. Excellent use of "Conditional Formatting".
Be advised that the FAA only needs to see the following:
Empty Weight calculations.
Gross Weight CG Calculations.
Most Forward CG Calculations.
Most Aft CG Calculations.
First Flight CG Calculations.
All the above must be at or within CG limits. DO NOT show the FAA any calculations that are OUTSIDE limits. As the builder, you set the gross weight but it is advisable to follow the designers numbers. IF you end up with a gross weight that is greater than what the designer set, know that you are operating outside the design envelope.
As you already know, you must carry a copy of the weight and balance in the aircraft and make it available for any ASI that asks to see it. If you use the WORST CASE loading for the above conditions, you have a "Go - No Go" bracket for any flight. Yes it is still good to know EXACTLY the loading but for a "Ramp Check", the above minimum is all the FAA needs to see to verify that you are operating safely. The above will also print out neatly on one piece of paper if you use both sides.
I would like to advise that you only give the FAA exactly what they need. Giving more than is needed could open you up for a lot of extra questions from the inspector.
Gary A. Sobek
"My Sanity" RV-6 N157GS O-320 Hartzell,
2,346+ Flying Hours So. CA, USA
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