Aerobatic maneuver


Aerobatic maneuver
The UK Utterly Butterly display team perform an aerobatic maneuver with their Boeing Stearmans, at an air display in England.

Aerobatic maneuvers are flight paths putting aircraft in unusual attitudes, in air shows, dog fights or competition aerobatics. Aerobatics can be performed by a single aircraft or in formation with several others. Nearly all aircraft are capable of performing aerobatics maneuvers of some kind, although it may not be legal or safe to do so in certain aircraft.

Aerobatics

Aerobatics consist of five basic maneuvers: Lines (both horizontal and vertical), Loops, Rolls, Spins, and Hammerheads. Most aerobatic figures are composites of these basic maneuvers with rolls superimposed.

Table of the basic aerobatic figures

Most of these can be entered either erect or inverted, flown backwards or have extra rolls added.

Where appropriate, the Aresti Catalog symbols have been included. Not all the figures are competition figures, and so some do not have diagrams to accompany the description.

Reading the diagrams, a figure begins at the small solid circle and ends at the short vertical line. Inverted flight (negative g) is depicted by dashed red lines. The small arrow indicates a rolling maneuver.

Figure Name Description Aresti Symbol
Chandelle
Chandelle Consists of a maximum climb, maximum bank combination to obtain the greatest altitude gain for a given airspeed and at the same time making a 180° course reversal. (Low, positive g maneuver can be performed in all aircraft.) (Not a competition figure.)
Cuban Eight
Cuban Eight 5/8s of a loop to the 45 degree line, 1/2 roll,3/4s of a loop to the 45 degree line, 1/2 roll, 1/8s of a loop to level flight (half of the Cuban Eight is called a "half Cuban Eight", and the figure can be flown backwards, known as a "Reverse Cuban Eight").
Aeros fig cuban8.svg
Half Cuban Eight From level flight, 5/8s loop to the inverted 45° line, 1/2 roll to erect down 45° line, pull to level flight.
Aeros fig halfcuban8.svg
Reverse Half Cuban Eight From level flight pull to the 45° up line, 1/2 roll to inverted 45° up line, then 5/8s of a loop to level flight.
Aeros fig revhalfcuban8.svg
Hammerhead; Stall Turn
Hammerhead; Stall Turn 1/4 loop (pull or push) to vertical, as momentum/airspeed decreases, rudder is applied and the aircraft rotates around its yaw axis, the nose falls through the horizon and points towards the ground, a momentary pause is made to draw the vertical down line, and 1/4 loop to level flight. This figure is sometimes called a stall turn which is a misnomer because the aircraft never actually stalls. The manoeuvre is performed when the aeroplane decelerates through 20 - 30kts (more or less, depending on the aeroplane flown) of airspeed. The cartwheel portion of the hammerhead is performed with full rudder and full opposite aileron. Gyroscopic forces from the propeller during the rapid rate of yaw will produce a pitching and rolling moment and a degree of forward stick will be required to keep the aeroplane from coming off-line over the top. The yaw is stopped with opposite rudder while the ailerons and elevator remain in position, then once the yaw is stopped and the aeroplane is pointed down vertically, all controls are returned to neutral together. Although they can be flown left or right in any aeroplane with the proper technique, a hammerhead is best flown to the left with a clockwise rotating prop, and to the right with an anticlockwise rotating prop (as in a Yakovlev type), due to propeller torque/gyroscopic effects.
Aeros fig hammerhead.svg
Immelmann; Roll-off-the-top; Split S
Immelmann; Immelmann turn; Roll-off-the-top; half loop, half roll 1/2 looping up followed by half a roll. There should be no pause between the end of the looping section and the start of the roll to erect flight.
Aeros fig Immelmann.svg
Split S Essentially an Immelmann in reverse. Half roll (from erect to inverted) followed by positive pitch to give a half loop. Converts altitude to airspeed, and reverses direction.
Aeros fig splits.svg
Up lines
Vertical up Fly the aircraft so that the fuselage is perpendicular to the ground (along the wings' Zero lift axis). The attitude of the aircraft is judged, not the flightpath, therefore the aircraft may drift downwind during a vertical maneuver.
Aeros fig vertup.svg
45° up line Fly the vertical attitude plus or minus 45°. As for vertical lines the attitude of the aircraft is judged, not the flightpath as viewed by a ground observer, which may differ depending on whether the figure is flown into or with the wind, and the wind strength.
Aeros fig 45up.svg
Loop
Inside loop A vertical circle entered from straight and erect level flight. A positive pitching movement is used at all points in the loop to draw the circle, so that the aeroplane canopy is pointing inwards. Both the inside and outside loop are sometimes casually referred to as a 'loop the loop'.
Aeros fig insideloop.svg
Outside loop A vertical circle entered from straight and erect level flight, canopy pointing out of the loop. Loop can be above or below the straight and level entry altitude, from erect or inverted attitude. (Draws extreme negative G)
Aeros fig outsideloop.svg
English bunt Half an outside loop starting from upright, straight and erect level flight. (The pilot pushes the stick forward and draws a half circle in the sky from the top down.)
Aeros fig englishbunt.svg
Spin
Erect spin; Inverted spin; Flat spin A family of auto-rotational maneuvers, consisting of normal or "flat" spins, either upright or inverted. Two components must exist to spin an aircraft: 1) critical angle of attack (COA), which means that the aircraft is stalled, and 2) yaw.
Aeros fig spin.svg
Tailslide
Tailslide, the Bell 1/4 looping up, straight vertical (full power) until the aircraft loses momentum. The aircraft falls backwards, tail first, until the nose drops through the horizon to a vertical down position. 1/4 loop (push or pull) to recovers to level flight.
Aeros fig tailslide.svg
Snap Roll; Flick roll; Flick
Snap Roll; Flick roll; Flick A family of rapid autorotational or "horizontal spins," not unlike spins. Rotation is induced by a rapid pitch input followed by rapid yaw input, thus stalling one wing further than the other. This imbalance in lift causes the high speed roll.
Aeros fig flickroll.svg
  • Dive; extreme nose down attitude (not necessarily vertical), resulting increase in airspeed, and descent rate.
  • Lazy eight; 1/4 looping up, wingover (left or right), 1/2 looping down+up, wingover (right or left), 1/4 looping down
  • Lomcovak; family of autorotational, tumbling figures. In all varierties, the aircraft appears to tumble out of control. For example, one style involves the aircraft tumbling (simultaneously) nose over tail and wingtip over wingtip in a negative-g, gyroscopic condition. Introduced by Slovaks such as Ladislav Bezak, and others.
  • Pugachev's Cobra; the nose of the aircraft is pulled up suddenly. The aircraft pitches up to 90°-120º angle of attack. The nose then falls back to the horizontal, and the aircraft accelerates away in the original direction[1]
  • Kulbit; post-stall maneuver similar to Pugachev's Cobra, but going to 360° pitch angle, flying a "loop"
  • Roll; 360° revolution about the longitudinal axis
  • Barrel roll; a combination of a loop and a roll. The flight path during a barrel roll has the shape of a horizontal corkscrew and follows a helical path.
  • Aileron roll
  • Hesitation roll
  • The Scissors; flying in a vertical zigzagging pattern.
  • Standing eight; inside loop, 1/2 roll (inverts the aircraft), inside loop (towards the ground) 1/2 roll on top of the loop
  • Wingover; left or right 180° tight turn (yaw) at the top of a 1/4 looping (up)
  • Zoom; extreme nose up attitude (not necessarily vertical), resulting in airspeed loss, and increased rate of climb...

See also

External links


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