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Old 10 November 2008, 01:00 PM   #1261 (permalink)
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It looks like M/N or M over n,not mm and if you look at the zeros in the other numbers on the page, it doesn't look like it's the number 80 either.

Just an observation.

Sean
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Old 10 November 2008, 02:17 PM   #1262 (permalink)
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Definitely a brain teaser.
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Old 10 November 2008, 03:04 PM   #1263 (permalink)
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Quote:
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According to the cash drawings (working from memory here) the angle of attack on the bottom wing is 1.5 deg.
Jeff,
I'm sorry to be picky... but don't you mean angle of incidence?

You are doing a great job here and I'm thoroughly enjoying watching you build this aircraft...

rob
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Old 10 November 2008, 03:20 PM   #1264 (permalink)
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Quote:
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Jeff,
I'm sorry to be picky... but don't you mean angle of incidence?
rob
You are absolutely correct here Rob, I do mean Incidence.

Here is my problem ... Mostly when I find something like this, you can see that the error is caused by a fat pencil & poor eyesight measuring the drawing. This is usually just a millimeter or two. This error is a whopping 13mm! So I am left wondering where I went wrong.

Highslide JS

I guess I am also wondering if 1.5 deg. angle of incidence is based on the bottom of the airfoil, or the aerodynamic cord line.
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Old 10 November 2008, 06:09 PM   #1265 (permalink)
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Aoi
My vote would be the chord.
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Old 10 November 2008, 06:30 PM   #1266 (permalink)
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Unfortunately, it is not that simple. As you see in the drawing, the apex of the circle on the nose of the rib is 36mm, while the angle of incidence should only be 31. That means lowering the nose of the rib by 5mm.

Plus the cash drawing shows an increase using a line along the bottom edge of the rib. I just am not sure how much that line is elevated.
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Old 11 November 2008, 12:14 AM   #1267 (permalink)
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Jeff,

Perhaps you are right and the drawing is wrong. It happens.
I would look to an alternative scource for a comparison.
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Old 11 November 2008, 05:03 AM   #1268 (permalink)
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1200/15 = 80 M/n ..... this may help explain Cash's drawing: M/n Polygon

Looking good Jeff!

WF2
Last edited by womenfly2; 11 November 2008 at 05:33 AM.
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Old 11 November 2008, 05:09 AM   #1269 (permalink)
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what does the math say if you use the bottom of the airfoil? Looking at the drawing where it says alpha = 1.5... the arrows only go to the bottom of the airfoil.

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Old 11 November 2008, 05:11 AM   #1270 (permalink)
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Aoa
Lowering the nose by 5mm may indeed put the AOA at 1.5. If the AOA and the AOI is suppose to be the same your fine.
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