Physics Asked on January 19, 2021
I can’t seem to find much information regarding the size of the Vent (the hole).
Nor can I find a concrete answer to the value of the drag coefficient, $C$. I’ve read in some websites that $C$ is usually around $1.4$.
If someone could tell me, or, better yet, point me to some sources (books that are readily available on-line, or websites, for example), it would be deeply appreciated.
Your best information source for this would be to contact your nearest skydive center and ask to speak to a rigger. If you prefer to use the web, you could ask on dropzone.com. The vents in round parachutes were 4 cells removed and replaced with mesh to provide some "drive". Not a lot but some. And the vent at the top was to prevent huge oscillations as air spilled out the bottom.
Answered by D-- on January 19, 2021
Hoerner's Fluid-Dynamic Drag has an extensive collection of drag data, including a section on the "Characteristics of Parachutes."
It does give data for the effect of a hole in a flat plate normal to the flow, but I couldn't find anything about the effect of the parachute's camber. Nevertheless, there's much that should be of interest to you there.
It is available to download at the following site: http://dl.kashti.ir/ENBOOKS/NEW/FDD.pdf
Answered by D. Halsey on January 19, 2021
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