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Until these, I had only ever seen round military parachutes. The slots also differ between paratroop paratroop

and cargo. cargo

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The top pic is the new T-11 canopy adopted by the US Army. Has a significantly lower descent rate and less opening shock compared to the old T-10.

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    $\begingroup$ Does square have anything to do with descent rate, or is it just size? $\endgroup$
    – Pilothead
    May 25, 2018 at 1:00
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    $\begingroup$ It's quite a bit bigger than a T10, hence lower descent rate, and the square shape with vents at the corners limits oscillations, allowing shorter lines and reducing injuries from getting smacked into the ground mid-swing. There is a slider panel reefing system similar to what's used on ram air parachutes slows the inflation speed. Supposed to be a huge drop in injury rates, about 3/4. $\endgroup$
    – John K
    May 25, 2018 at 13:30

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