Aerobatics

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with their Boeing Stearman s, at an air display in England.]]
Hawks in Concorde formation]]

In the early days of flying, pilots realised that their Aircraft could be used as part of a flying Circus to entertain people or impress others by performing aerobatics. Maneuver s that had no practical purpose were flown for artistic reasons or to draw gasps from onlookers. In due course some of these maneuvers were found to allow aircraft to gain tactical advantage during aerial combat or " Dog Fight s" between fighter aircraft. The word presumably derives from the term used by human gymnasts - Acrobatics - to describe exercises designed to impress or build muscle strength.

Many Aerobatic Maneuver s involve rotation of the aircraft about its longtitudinal axis - rolling - or the pitch axis - looping. Some complex maneuvers - such as a Spin (flight) - also require that the aircraft be displaced around a vertical axis, known as yawing. Maneuvers are often combined which demands a higher level of skill from the pilot, but greatly increases the spectacle of an aerobatic flight sequence.

Formation aerobatics are usually flown by teams of up to sixteen aircraft, although economic considerations mean that most teams habitually fly between four and ten aircraft. Some are state funded to reflect pride in the Armed Forces whilst others are commercially sponsored. Coloured smoke trails may be emitted to emphasise the patterns flown and/or the colours of a national flag. Usually each team will use aircraft similar to one another finished in a special and dramatic colour scheme, thus emphasising their entertainment function.

Famous teams include the Southern Cross (Cruz del Sur -- Argentine Air Force), Turkish Stars (Türk Yıldızları) (Turkey), Brazilian Air Force Demonstration Squadron (Esquadrilha Da Fumaça) , Black Arrows (South Korea), Blue Angels (United States Navy), Diables Rouges (Belgian Air Force), Frecce Tricolori (Italian Air Force), Halcones (Chilean Air Force), Patrouille De France (French Air Force), Patrouille Suisse (Swiss Air Force), Red Arrows (Royal Air Force -- Great Britain), Red Pelicans , Rothmans , Silver Falcons (South African Air Force), Roulettes (Australian Air Force), Royal Jordanian Falcons (Royal Jordanian Air Force), the USAF Thunderbirds (United States Air Force), Snowbirds (Royal Canadian Armed Forces), the Patrulla Aguila (Eagle Patrol -- Spanish Air Force), Saudi Hawks (Royal Saudi Air Force), and the Yellowjacks .

Teams often fly V-formations - they can't fly directly behind another aircraft, or they'd get caught in the wake vortices or engine exhaust. Aircraft will always fly slightly below the aircraft in front, if they have to follow exactly in line.

Aerobatic aircraft usually fall into two categories - specialist aerobatic, and aerobatic capable. Specialist designs such as the Pitts Special , the Extra 200 and 300 , and the Sukhoi Su-29 aim for ultimate aerobatic performance. This comes at the expense of general purpose use such as touring, or ease of non aerobatic handling such as landing. At a more basic level, ''aerobatic capable'' aircraft can be dual purpose - equipped to carrying passengers and luggage, easy to land, as well as being capable of basic aerobatic figures.

Aerobatics are taught to military fighter pilots as a means of developing precise flying skills and for tactical use in combat.

Aerobatics are also practiced as a Sport . Some pilots fly solely for recreation, whilst a smaller number (about 600-800 in the USA) choose to compete in Aerobatic Competitions . US Competitions start at 'Primary ' level and proceed in complexity through Sportsman, Intermediate and Advanced, with 'Unlimited' being the top competition level. Unlimited pilots perform much more complex figures and sustain higher G Levels (+/- 10g's). A Sample Competition Sequence is described Here , along with a good description of how it should be flown.

Aerobatic Maneuver s flown in a jet powered aircraft are limited in scope as they cannot take advantage of the gyroscopic forces that a propeller driven aircraft can exploit. Jet powered aircraft also tend to fly much faster which increases the size of the figures and the length of time which the pilot has to withstand increased g-forces. Jet aerobatic teams often fly in formations which further restricts the maneuvers that can be safely flown.

All Aerobatic Maneuvers demand proper training and regular practice to avoid Accident s. Fortunately such accidents are rare but can result in fatalities; safety regulations are such that there has not been an airshow spectator fatality in the USA since the 1950s . Low-level aerobatics are extremely demanding and airshow pilots must demonstrate their ability before being allowed to gradually reduce the height at which they may fly their show. Virtual aerobatic flying, can be flown as well.

Aerobatics are most likely to be seen at a public Airshow .

SEE ALSO:

Flight Dynamics

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Aerobatics