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GeoB
Joined: 16 Jun 2009
Posts: 207
Location: Fresno, CA
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 Posted: Wed Mar 12, 2014 11:15 pm Post subject: Kolb-List Digest: 7 Msgs - 03/11/14 |
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| Quote: | showing the equivalent cross sections of a wire, a square rod
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Saw that video. Convinced me.
| Quote: | Note carefully the decimal point locations.
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Umm.. on what diagram? "Streamline That Tubing"?
Do you know of a good source for the construction details other than buying
another complete book? As I looked at the diagram I felt it was missing the
dimension that locates the widest part of the streamline. Plus, I wasn't
sure what it means with the "4X Tubing O.D." Couldn't figger out fer sure
what it meant. Not the circumference is it? Seems that would be a useless
bit of info. Have any one of us built these? I have some dacron, thinking
about covering foam with dacron and paint maybe.
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_________________
GeoB
"Members of Congress should be compelled to wear uniforms like NASCAR drivers, so we could identify their corporate sponsors" |
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ceengland7(at)gmail.com
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| Posted: Thu Mar 13, 2014 6:31 am Post subject: Kolb-List Digest: 7 Msgs - 03/11/14 |
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On 3/13/2014 2:15 AM, George Bearden wrote:
| Quote: |
> showing the equivalent cross sections of a wire, a square rod
Saw that video. Convinced me.
> Note carefully the decimal point locations.
Umm.. on what diagram? "Streamline That Tubing"?
Do you know of a good source for the construction details other than buying
another complete book? As I looked at the diagram I felt it was missing the
dimension that locates the widest part of the streamline. Plus, I wasn't
sure what it means with the "4X Tubing O.D." Couldn't figger out fer sure
what it meant. Not the circumference is it? Seems that would be a useless
bit of info. Have any one of us built these? I have some dacron, thinking
about covering foam with dacron and paint maybe.
For the decimal point reference: in the table in that article: 0.085 for
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streamline vs 1.03 for round. Streamline has less than 1/10th the drag
of a round tube. Also interesting to note that a round tube has *higher
drag* than a square tube (which would be 1.00, the reference).
I agree, the '4x tube OD' in the drawing is rather vague. I think he's
saying that the length of the streamline is 3x tube OD, the max width of
the streamline is 1.07x tube OD, and the length around the curve of the
streamline is 4x the tube OD. I can only assume that he's trying to give
some rough specs for 'rolling your own', without the required (rather
convoluted, for non- mathematician) calculations.
Don't some of the ultralite suppliers sell plastic streamline tubing
that just snaps around round tube?
Charlie
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jbhart(at)onlyinternet.ne
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| Posted: Thu Mar 13, 2014 6:59 am Post subject: Kolb-List Digest: 7 Msgs - 03/11/14 |
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At 12:15 AM 3/13/2014 -0700, you wrote:
| Quote: |
Do you know of a good source for the construction details other than buying
another complete book? As I looked at the diagram I felt it was missing the
dimension that locates the widest part of the streamline. Plus, I wasn't
sure what it means with the "4X Tubing O.D." Couldn't figger out fer sure
what it meant. Not the circumference is it? Seems that would be a useless
bit of info. Have any one of us built these? I have some dacron, thinking
about covering foam with dacron and paint maybe.
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How I made trailing edge and strut fairings:
http://www.jackbhart.com/firefly/firefly105.html
http://www.jackbhart.com/firefly/firefly91.html
Jack B. Hart FF004
Winchester, IN
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