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Looking for Clarity

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wwz7777

Well-Known Member
Supporting Member
Joined
Aug 8, 2012
Messages
120
Location
Northfield, MN
Hi all,

The following book is in the Technical References forum and has 3 smiley faces.

IMG_0310.jpeg

In it, there’s a graph that I can’t find anywhere.

IMG_0312.jpeg

I’ve gone through ANC-18 and -19 and can’t find it. Any ideas?

Another question. He uses a table from Bruhn to determine his wings moment and shear. He then takes the two moments, M1 (positive) and M2 (negative) to determine the dimensions of his wooden spar caps. He gives the spar height, H, as 8.15 inches and the cap width, B, as 3.0 inches. He uses the following equations and the graph to get those thicknesses. I haven’t been able to find those equations or their explanations as to how or why to use them anywhere. It seems like a quick way to get some numbers and then go into ANC-18 to verify. These equations may be derivatives of more complex equations but I have no idea.image.jpg

I really appreciate all the help you awesome people provide to those of us who aren’t engineers!

And if someone can educate me as how to post smaller pictures, I greatly appreciate it.
 
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