calculate the area of skydivers parachute so that if he lands he doesn't hurt his legs. You can put in your own mass and stuff in if you want.
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The time is approximately proportional to the inverse of the terminal velocity, so it's approximately proportional to Area/Mtotal = A/(Mp +Mw), where A is the area, Mp is the parachute mass and Mw is the other mass. Once Mp is much bigger than Mw.
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RECOMMENDED PARACHUTE SIZES Rockets 12″ and shorter – use streamer recovery or an 8″ chute. Rockets 12″ to 18″ tall – use a 12″ chute. Rockets 18″ to 24″ tall – use a 12″ or 18″ chute. Rockets 24″ and taller – use a 18″ or 24″ chute.
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