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Originally Posted by freebeard
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That is interesting but I didn't really understand this bit from the linked wiki article:
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For maximum effectiveness in suppression of vortices caused by air flow, each fin or strake should have a height of about 10 percent of the cylinder diameter. The pitch of each fin should be approximately 5 times the cylinder diameter.
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What exactly do "height" and "pitch" mean here?
I can guess that pitch means the vertical difference between 2 bits of the fin, but them what is the height? Do they mean the width of the fin, measured radially from the outside edge of the central cylinder to the outer edge of the fin?
Maybe it is the way my mind works, or maybe it is my total lack of engineering knowledge, but to me the article would be much easier to understand if it included a diagram to show these measurements.