Speed skydiving is a skydiving competition in which the goal is to achieve and maintain the highest possible terminal velocity. It was developed in the late 1990s and is the fastest non-motorized sport on Earth. The speed, achieved by the human body in free fall, is a function of several factors; including the body's mass, orientation, and skin area and texture.[1] In stable, belly-to-earth position, terminal velocity is about 200km/h (120mph). Stable freefall head down position has a terminal speed of 240–290km/h (around 150–180mph). Further minimization of drag by streamlining the body allows for speeds over 500km/h (310mph).
Mascia Ferri, winner of the Italian Nationals gold medal in 2019
Speed Skydiving is a competition discipline within the sport of Skydiving. The competition objective is for the competitors to fly their body as fast as possible to achieve the highest average vertical speed through a 3 second window.
The speed is measured using a Speed Measuring Device (SMD) worn on the competitor’s helmet. The current technology used to measure the speed is GPS technology using the FlySight device (https://www.flysight.ca/). Previously (see below) barometric measuring devices were used.
The competitors exit from the competition aircraft between 13,000ft and 14,000ft (3,962m to 4,267m). Each competitor then turns 90° from the direction in which the aircraft is travelling, alternately left and right. The competitors then accelerate by flying head-first towards the earth, only slowing down once they have passed the 7,400ft competition window from their exit altitude. The score is the average vertical speed in km/h of the fastest 3 second which the competitor achieves within the competition window.
The current world record for the fastest competitor using the GPS measuring system is Marco Hepp from Germany. He flew 529.77 km/h in the competition window at the 4th FAI World Speed Skydiving Championships in October 2022. The fastest female competitor is Natisha Dingle of Australia who flew 491.99 km/h in the competition window at the same competition.
2022 World Championships Podium: Natisha Dingle (1st), Maxine Tate (2nd), Ingrid van Deelen (3rd)
History
The first competition organized in the USA in Deland Florida was in 1998 with the barometric Protrack built by Larsen & Brusgaard (https://www.lbaltimeters.com/). The first speed skydiving competition in Europe[2] was organized in September 1999 at the drop zone Gap-Tallard (France) and was won by Mike Brooke.[3][4][5] The first international world cup was organized in 2000[6][7] by the ISST (International Speed Skydiving Tribe) led by Mike Brooke who pushed the sport forwards with use of two measuring devices. The devices were set on each side of the parachute of each participant instead of the foot to take away effects of dynamic air pressure on the results. An International speed skydiving world cup[8] was run in Deland (Florida),[9] Lincolnshire, UK, Botten, Switzerland, Lapalisse (France), Empuriabrava (Spain), Texel (Holland).
Terminal Velocity
The terminal velocity of a falling body occurs during free fall when the force due to gravity is exactly balanced by the force due to air resistance, such that the body experiences zero acceleration. The formula for terminal velocity (where buoyancy in air is negligible) is given by the thrust
Marco Hepp, 2022 World Champion Speed Skydiving, with the Tim Mace Trophy
Cd is the drag coefficient (~0.7 for head down position, ~1 for belly-to-earth position)[10]
ρ is the density of the fluid through which the object is falling (1.23kg/m3 for air at sea level, and ~0.99kg/m3[11] at the middle of the measurement zone (2200m))
A is the projected area of the object, or area cross-section (~0.18 m2 for head down position, ~0.7 for belly-to-earth position)[10]
So, for a human in belly-to-earth position (A = 0.7 m2, m = 90 kg, Cd = 1) this gives 50.6m/s, about the terminal velocity of the typical skydiver of 55m/s.
The skydiver cannot increase their mass easily enough to significantly increase terminal velocity, and the skydiver's area cross-section is limited by their helmet and shoulders in a head-down dive position. The most significant difference comes from the skydiver reducing their coefficient of friction. The head-down body position has to be carefully managed to be as streamlined as possible, while special helmets and slick body suits reduce skin friction, which is a function of surface area and texture. The shape and rigidity of the suits also have to be designed to minimize the coefficient of drag.[12] Finally, a skydiver must reach their maximum speed at as high an altitude as possible so that the density of air is at a minimum.
Weather
Weather can have an extraordinary effect on a competition as well as individual divers. In the event of bad weather or air traffic circumstances, the exit altitude is lowered. In addition, thick cloud conditions may cause a delay in the jump time altogether.
A parachute is a device used to slow the motion of an object through an atmosphere by creating drag or, in a ram-air parachute, aerodynamic lift. A major application is to support people, for recreation or as a safety device for aviators, who can exit from an aircraft at height and descend safely to earth.
Freeflying is a skydiving discipline which began in the late 1980s, involving freefalling in various vertical orientations, as opposed to the traditional "belly-to-earth" orientation. The discipline is known to have originated when Olav Zipser began experimenting with non-traditional forms of bodyflight. Zipser founded the FreeFly Clowns as a two-person competitive team with Mike Vail in 1992. He was joined by Omar Alhegelan, Charles Bryan, and Stefania Martinengo in 1994. The FreeFly Clowns are also credited with opening the first school to teach freeflying, The First School of Modern SkyFlying.
In Newtonian physics, free fall is any motion of a body where gravity is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it.
Sky surfing is a type of skydiving and extreme sport in which the skydiver wears a custom skysurf board attached to the feet and performs surfing-style aerobatics during freefall.
Terminal velocity is the maximum velocity (speed) attainable by an object as it falls through a fluid. It occurs when the sum of the drag force (Fd) and the buoyancy is equal to the downward force of gravity (FG) acting on the object. Since the net force on the object is zero, the object has zero acceleration. For objects falling through regular air, the buoyant force is usually dismissed and not taken into account as its effects are negligible.
Wingsuit flying is the sport of skydiving using a webbing-sleeved jumpsuit called a wingsuit to add webbed area to the diver's body and generate increased lift, which allows extended air time by gliding flight rather than just free falling. The modern wingsuit, first developed in the late 1990s, uses a pair of fabric membranes stretched flat between the arms and flanks/thighs to imitate an airfoil, and often also between the legs to function as a tail and allow some aerial steering.
Tracking is a technique used by skydivers during freefall to increase their horizontal speed. Tracking is considered a fundamental skill in the sport because it allows multiple skydivers to gain separation from each other prior to deploying their parachutes. Nearly all licensing organizations mandate a student show proficiency at tracking in order to obtain their skydiving license.
Canopy piloting encompasses several disciplines, all involving the flight of a skydiving parachute.
Tandem skydiving or tandem parachuting refers to a type of skydiving where a student skydiver is connected to an instructor via a harness. The instructor guides the student through the whole jump from exit through freefall, piloting the canopy, and landing. The student needs only minimal instruction before making a tandem jump with the instructor. In the United States most skydiving centers and clubs require that participants be 18 years or older to skydive whereas in other countries the minimum age can be lower or higher. This is one of three commonly used training methods for beginning skydivers; the others being Static line, Instructor-assisted deployment (IAD), and Accelerated freefall (AFF) (k).
A vertical wind tunnel (VWT) is a wind tunnel that moves air up in a vertical column. Unlike standard wind tunnels, which have test sections that are oriented horizontally, as experienced in level flight, a vertical orientation enables gravity to be countered by drag instead of lift, as experienced in an aircraft spin or by a skydiver at terminal velocity.
A set of equations describing the trajectories of objects subject to a constant gravitational force under normal Earth-bound conditions. Assuming constant acceleration g due to Earth’s gravity, Newton's law of universal gravitation simplifies to F = mg, where F is the force exerted on a mass m by the Earth’s gravitational field of strength g. Assuming constant g is reasonable for objects falling to Earth over the relatively short vertical distances of our everyday experience, but is not valid for greater distances involved in calculating more distant effects, such as spacecraft trajectories.
Freestyle skydiving is a competitive skydiving discipline where one member of a two-person team performs acrobatic manoeuvres in free fall while the other one films the performance from a close distance using a helmet-mounted camera.
Accuracy landing is one of the oldest skydiving disciplines, in which skydivers attempt to land as closely as possible to a pre-determined target.
Altitude can be determined based on the measurement of atmospheric pressure. The greater the altitude, the lower the pressure. When a barometer is supplied with a nonlinear calibration so as to indicate altitude, the instrument is a type of altimeter called a pressure altimeter or barometric altimeter. A pressure altimeter is the altimeter found in most aircraft, and skydivers use wrist-mounted versions for similar purposes. Hikers and mountain climbers use wrist-mounted or hand-held altimeters, in addition to other navigational tools such as a map, magnetic compass, or GPS receiver.
Roger Warren Nelson was a skydiver and founder of Skydive Chicago, one of the largest skydiving centers in the United States.
Parachuting and skydiving is a method of transiting from a high point in an atmosphere to the ground or ocean surface with the aid of gravity, involving the control of speed during the descent using a parachute or parachutes.
A glider or sailplane is a type of glider aircraft used in the leisure activity and sport of gliding. This unpowered aircraft can use naturally occurring currents of rising air in the atmosphere to gain altitude. Sailplanes are aerodynamically streamlined and so can fly a significant distance forward for a small decrease in altitude.
Red Bull Stratos was a high-altitude skydiving project involving Austrian skydiver Felix Baumgartner. On 14 October 2012, Baumgartner flew approximately 39 kilometres (24 mi) into the stratosphere over New Mexico, United States, in a helium balloon before free falling in a pressure suit and then parachuting to Earth. The total jump, from leaving the capsule to landing on the ground, lasted approximately ten minutes. While the free fall was initially expected to last between five and six minutes, Baumgartner deployed his parachute after 4 minutes and 19 seconds.
Skydive Empuriabrava is the brand that has been commercially operating Empuriabrava Aerodrome since 1985. Since it began operating its main activity has been skydiving although it also offers photo flights, aerial and tourist advertising, and runs a school of aviation for private pilots.
Kyra Poh is a Singaporean indoor skydiver.
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