![]() ![]() Use the chart to estimate your freefall time according to your approximate terminal velocity and the distance in freefall.Subtract your opening altitude from your exit altitude to determine the length of your freefall.Acceleration due to gravity is 9.81 meters per second squared downward. Determine your approximate terminal velocity by taking actual measurements of jumps with known exit and opening altitudes (this can be done by timing video tapes, by having someone on the ground time the skydive, or using a recording altimeter). A ball is thrown straight upwards with an initial velocity of 10 meters per second.To determine the approximate amount of freefall time to expect on a jump and to log a realistic amount of freefall time for a jump, use the following procedures:.50 mph (73.3 feet per second) for wing-suit jumps Based on air resistance, for example, the terminal speed of a skydiver in a belly-to-earth (i.e., face down) free fall position is about 55 m/s (180 ft/s).160 mph (235 feet per second) for vertical head-down or standing orientation.120 mph (176 feet per second) for belly-to earth orientation.The chart lists freefall times based on three different typical terminal velocities and provides an exit altitude reference for 3,000-foot openings.skydiving discipline, e.g., vertical orientations.total weight of the jumper including equipment.Many factors affect the rate of fall or terminal velocity in freefall.The gravitational acceleration g decreases with the square of the distance from the center of the planet. The amount of freefall time logged for each jump should be actual time. the value of g is 9.8 meters per square second (32.2 feet per square second) on the surface of the Earth, and has different values on the surface of the Moon and Mars. ![]() Each skydiver should log every jump made, including the amount of freefall time experienced.The following table will assist in estimating the approximate amount of freefall time to be expected from a given altitude and in logging the correct amount of freefall time for a given jump.6-3: Freefall Rate of Descent and Time Table A. ![]()
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