Parachutes are not rated by their speed.
A parachute works by increasing the air resistance of a suspended falling body or object. The greater the mass of the object the larger the area of the parachute must be to reduce the speed to an acceptable level.
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all you have to do is Tye a sting to each corner and then Tye it to an object
It was originally Silk, I think it's Nylon now.
There are 2 types of "rip-stop" nylon used in making parachutes. One is "zero porosity", or zero P and the second is called "F-111" (I think this is a scientific number for it's porosity)
Zero porosity nylon allows no air to pass through the fabric, so when the air inflates the canopy, it makes for a more ridgid airfoil, and a more stable one as well. This is the most common material used for parachutes now.
Years ago, replacing silk, was an invention called "F-111" This nylon allows a certain amount of air to pass through it's pores, making a parachute respond at a slower rate than zero p.
Nylon. There are lots of different parachute manufacturers. They have many different kinds of canopies for many different types of skydivers- free flyers, relative work, accuracy, swooping, etc. would likely use a different rig for each. Figure out what you want to be doing, then read the ads that are geared towards that type of jump.