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Old 09-04-2010, 11:12 PM
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blackshire blackshire is offline
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Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
Default "Smiley-cut" streamers?

Hello All,

As I was walking home this afternoon, I saw something at a neighborhood store that I think may improve the performance of streamer recovery systems. "The Red Couch" store/deli has a banner (more like a vertically-suspended flag) imprinted with the store's logo and name that hangs from an "L"-shaped metal support frame; the banner's hanging corners are secured to the frame by short lengths of cord.

The banner has several rows of "smiley-shaped" (semicircle) cuts that allow the wind to blow through the semicircular openings, which prevents the wind from making the banner bulge outward like a sailboat's spinnaker sail. (The loose semicircular sections of the banner flutter back and forth through the semicircular openings when the wind blows.)

If such cuts were applied to plastic or fabric streamers, the flapping sections would greatly increase the streamers' drag, and they might also induce such streamers to flutter and flap back and forth more vigorously. Also, semicircular cuts might not be necessary to achieve this--a streamer that is folded lengthwise and then has a row of several straight, angled cuts made partway across it would (when unfolded) have a row of triangular holes and triangular flapping sections.
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