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PostPosted: Thu Mar 15, 2018 4:48 am 
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Here are the presentation materials discussed last night:

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AC 90-109.pdf [269.28 KiB]
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AC 90-89A.pdf [567.14 KiB]
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AC_90-116.pdf [1.14 MiB]
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Chapter 10 (Weight & Balance) of the Pilots Handbook of Aeronautical Knowledge (PHAK) may be found here:

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12_phak_ch10.pdf [5.08 MiB]
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And the presentation slides here:

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march, 2018 eaa 21 meeting.pptx [198.25 KiB]
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PostPosted: Thu Mar 15, 2018 7:07 am 
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Thanks Bill, great job last night. I wanted to share more accurate Cirrus performance figures. In my few hours in the SR20 I see a little less airspeed but also less fuel burn running LOP. I’m still learning so I’ll post new data next month.

Here’s the SR20 POH: http://www.cospilot.com/files/SR20_POH.pdf


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Vaughn DeCoster
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PostPosted: Fri Mar 16, 2018 5:38 am 
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Here are the March, 2018 meeting slides in PDF format:

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PostPosted: Fri Mar 16, 2018 6:10 am 
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OK, so Zeller was correct (though don't tell him I said so...). Herein is the POH data on the DA40-180 tapered wing and the APPROX MAC in feet. The inch conversion and W&B tolerance I calculated to be respectively:

MAC (inches) 45.72 and,
W&B tolerance for AC less than 5,000 lb. gross (see AC 43.13-1) is:
0.05 x MAC = 0.05 x 45.72 = 2.3 inches; wt. <=1.0 US pound

Note: these are estimates. Please check with your A&P for the actual requirements. These are considered "negligible weight and CG changes".

Reference FAA W&B Handbook and AC 43.13-1/2B for additional information (too big to attach here).


DA 40-180 Wing data from the POH:

Wing

Airfoil Wortmann FX 63-137/20- W4

Wing Area appr. 13.54 m2 appr. 145.7 sq.ft.

Mean aerodynamic chord (MAC) appr. 1.121 m appr. 3ft 8.1 in

Aspect ratio appr. 10.53 Dihedral appr. 5° )

Leading edge sweep appr. 1°


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