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Directional stability is the tendency of a vehicle or moving body to keep its orientation aligned with its direction of movement. When a car or an airplane
Directional_stability
Science of air vehicle orientation and control in three dimensions
aircraft stability: speed stability, stick free static longitudinal stability, static lateral stability, directional stability, oscillatory stability, and
Aircraft_flight_dynamics
Tailless fixed-wing aircraft that has no definite fuselage
For any aircraft to fly without constant correction it must have directional stability in yaw. Flying wings lack anywhere to attach an efficient vertical
Flying_wing
Aircraft motion combining rolling and yawing
roll results from relatively weaker positive directional stability as opposed to positive lateral stability. When an aircraft rolls around the longitudinal
Dutch_roll
Aircraft component
control surfaces, that provides longitudinal (pitch) and/or directional (yaw) stability and control. A stabilizer can feature a fixed or adjustable structure
Stabilizer_(aeronautics)
Aircraft component
Their role is to provide control, stability and trim in yaw (also known as directional or weathercock stability). It is part of the aircraft empennage
Vertical_stabilizer
Stability of an aircraft in the pitching plane
{\displaystyle -h} , so that positive stability is associated with positive static margin.) Directional stability Flight dynamics Handling qualities Phugoid
Longitudinal_stability
Aircraft flight measures
Each stability derivative is determined by the position, size, shape and orientation of the missile components. In aircraft, the directional stability determines
Stability_derivatives
Topics referred to by the same term
category. Stability (algebraic geometry) BIBO stability (Bounded Input, Bounded Output stability), in signal processing and control theory Directional stability
Stability
Railway relying on adhesion to move trains
used from frictional contact mechanics. The forces which result in directional stability, propulsion and braking may all be traced to creep. It is present
Adhesion_railway
Flight control surface
for example, the Concorde had small nose strakes "to get a better directional stability". Double delta wing aircraft (Concorde, Tupolev Tu-144, Boeing 2707
Strake_(aeronautics)
Extension of a boat's keel at the back, also a surfboard's fin
the name has been used for a fin on a surfboard which improves directional stability and to a movable fin on a kayak which adjusts the boat's centre
Skeg
Types of aircraft behavior
Damping is increased by large directional stability and small dihedral and decreased by small directional stability and large dihedral. Although usually
Aircraft_dynamic_modes
Rotation of a vehicle about its vertical axis
mis-alignment, and generate side forces as a consequence. From directional stability study, denoting the angular velocity ω {\displaystyle \omega }
Yaw_(dynamics)
Sharp angle in aircraft cross-sections used as control surface
significant effect on aircraft lift, drag, longitudinal balance and directional stability. The chines of the Lockheed Blackbird series extend about 40% of
Chine_(aeronautics)
Interceptor aircraft, British, 1960s–1980s
launches ensured adequate directional stability; later Lightning variants had a larger vertical fin, giving a greater stability margin at high speed. It
English_Electric_Lightning
Tendency for an aircraft to yaw opposite to a roll
used to reduce adverse yaw to ease the pilot workload: A strong directional stability is the first way to reduce adverse yaw. This is influenced by the
Adverse_yaw
Type of motor vehicle steering device
that increased responsiveness from speed is avoided, improving directional stability. The BMW active steering system utilizes a double planetary gear
Active_steering
Infraorder of marine mammals
smaller dolphins and porpoises, have a dorsal fin to facilitate directional stability. Cetaceans also have large brains and have high intelligence, complex
Cetacean
Angle between the vertical axis and the steering axis of a steered wheel, in side view
steering. This makes a vehicle easier to control and improves its directional stability (reducing its tendency to wander). Excessive caster angle will make
Caster_angle
Abrupt change in an aircraft's roll due to fuselage inertia
Techniques to prevent inertial roll coupling include increased directional stability (k) and reduced roll rate (ωr). Alternatively, the unstable aircraft
Inertia_coupling
Class of artillery
the gun. The spin imparted by the gun's rifling gives projectiles directional stability and increased range. Loading from the rear of the gun leaves the
Rifled_breech_loader
Species of rodent
main means of propulsion and the unique tail mainly important in directional stability. Muskrats spend most of their time in the water and can swim underwater
Muskrat
Aircraft phenomenon
nose of the aircraft into the wind. It should not be confused with directional stability, as experienced by aircraft in flight. The term also refers to a
Weathervane_effect
Outsize cargo version of the A300-600 airliner
tailplane was strengthened and fitted with auxiliary fins to maintain directional stability. The tailplane trim tank was also deleted. To provide access to
Airbus_Beluga
American carrier-based electronic warfare aircraft
included: Leading-edge strakes (to improve directional stability) Fin pod extension (to improve directional stability) Ailerons (to improve slow speed lateral
Grumman_EA-6B_Prowler
Bony skin-covered spines or rays protruding from the body of a fish
linear acceleration via oscillating propulsion, as well as providing directional stability; while paired fins are used for generating paddling acceleration
Fish_fin
Experiment in 1852 to demonstrate the Earth's rotation
its principal axes", allowing the study of a plane with "absolute directional stability". The mechanical precision of Foucault's gyroscope allowed this
Foucault's_gyroscope
First powered aircraft built by the Wright brothers
hdl:2060/19870013196, ... the Flyer was highly unstable ... The lateral/directional stability and control of the Flyer were marginal ... Culick, Fred E. C. (September
Wright_Flyer
Soviet medium-range airliner with 4 turboprop engines, 1957
factory was. The first prototype flew on 7 March 1957, revealing poor directional stability which led to a taller vertical fin, and later to hexagonal auxiliary
Antonov_An-10
Light boat that is paddled
matter of trade-offs: directional stability ("tracking") vs maneuverability; stability vs speed; and primary vs secondary stability. Multihull kayaks face
Kayak
Platform board used in the sport of surfing
or more fins (skegs) on the bottom rear of the board to improve directional stability, and numerous improvements in materials and shape. Modern surfboards
Surfboard
Phenomenon allowing supersonic aircraft to ride their own shockwave
The XB-70 had folding wingtips to enhance both compression lift and directional stability at high speeds.
Compression_lift
Chinese interceptor aircraft family
were eventually resolved, although it continued to suffer poor directional stability. The design was finalized on 31 December 1979. The J-8 was already
Shenyang_J-8
Helicopter built in the United States during World War II
Kellett chief test pilot Dave Driskill at the controls. A lack of directional stability was discovered, and was corrected by the addition of two extra tail
Kellett_XR-8
Fighter aircraft in the US Navy
the shock as it moved inside. The directional stability of an aircraft is provided by its vertical fin. This stability progressively decreases beyond Mach
Vought_XF8U-3_Crusader_III
Technique for correcting surface defects
potential. Diamond grinding also improves cornering friction, providing directional stability by tire tread-pavement groove interlock. Diamond grinding has been
Diamond_grinding_of_pavement
Prototype supersonic strategic bomber
It also added more vertical surface to the aircraft to maintain directional stability at high speeds. NAA's solution had an additional advantage, as it
North_American_XB-70_Valkyrie
Recreational boat or ship
shape and area. Sea kindliness is an indicator of steering ease, directional stability and quelling of motion induced by wind and waves. Multihulls offer
Yacht
Aircraft whose only horizontal aerodynamic surface is its main wing
wing tips, combined with steep downward-angled anhedral, enhanced directional stability. Although originally conceived as a monoplane, Dunne's initial designs
Tailless_aircraft
Tilting three-wheeled vehicle
and stability are usually used in this context to characterize whether the vehicle tilts, leans, or rolls as the rider wishes. As with directional stability
Tilting_three-wheeler
Rubberised fabric tactical inflatable boat used by the US Navy
the craft and gives the bottom of the hull a "V" shape, imparting directional stability and additional shock absorption. A wooden "transom" board at the
Combat_Rubber_Raiding_Craft
Process where information about current status is used to influence future status
loop ..." Araki, M., PID Control (PDF) Minorsky, Nicolas (1922). "Directional stability of automatically steered bodies". Journal of the American Society
Feedback
Soviet 1940s experimental supersonic aircraft
fitted with a 45 degree swept fin of greater aspect ratio to improve directional stability, resumed on 26 January 1949. However, further delays were caused
Bisnovat_5
Mid-19th century artillery type
accuracy and penetration as the spin induced to the shell gave it directional stability. During the 1860s and 1870s, rifled muzzle loaders were used as
Rifled_muzzle_loader
two-blade rotor mounted on a tubular framework above it. Small fins for directional stability were mounted at the rear of the skids. The pitch of the rotors was
Bensen_B-6
Aerobatic maneuver
\beta } is essentially the directional angle of attack of the airplane. It is the primary parameter in directional stability considerations. In vehicle
Slip_(aerodynamics)
Principle of automotive steering and handling
straight ahead position, less positive caster is needed to maintain directional stability. SAI adds positive camber while turning for both steering tires
Scrub_radius
Soviet heavy fighter prototype
lack of directional stability and the engines were unreliable and vibrated above 5,000 m (16,000 ft). Factory No. 51 attempted to fix the stability problem
Polikarpov_TIS
Soviet Air Force jet aircraft
a 45 degree angle with large two-section flaps. To provide more directional stability, a ventral fin was attached below the swept cruciform tail. The
Yakovlev_Yak-25
successful. The flexible tail section evidently offered inadequate directional stability, and the consequence was the Rotachute Mark II, that had a longer
Hafner_Rotachute
Ketch
Gipsy Moth IV with better directional stability to stop her broaching, but the modification did nothing to improve her stability. One day out on the return
Gipsy_Moth_IV
American aerospace engineer (1910–1990)
Model 10 airliner. He found the aircraft did not have adequate directional stability, but his professor felt it did and told Lockheed so. Upon completing
Kelly_Johnson_(engineer)
Part of a surfboard
mounted at the tail of a surfboard or similar board to improve directional stability and control through foot-steering. Fins can provide lateral lift
Surfboard_fin
Topics referred to by the same term
carbonized patterns (electrical treeing) appear on an insulator Directional stability, the tendency of a vehicle (typically referring to a watercraft)
Tracking
Lightweight boat constructed with flexible tubes containing pressurized gas
along the line of the hull to improve the hull's seakeeping and directional stability. These vessels are very light, so if powered with an engine, it
Inflatable_boat
Automotive concept
cornering, acceleration, and braking as well as on the vehicle's directional stability when moving in steady state condition. In the automotive industry
Automobile_handling
Russian-American engineer and scientist (1885–1970)
book}}: ISBN / Date incompatibility (help) Minorsky, N. (1922). "Directional stability of automatically steered bodies". Journal of the American Society
Nicolas_Minorsky
German-American scientist
even higher descent speeds into the transonic range without losing directional stability. The X-5 and substituted greater explosive power for descent speed
Max_Kramer
Soviet transport aircraft
production was not recommended due to poor spin characteristics, directional stability and control issues, nosewheel shimmy, poor controllability when
Antonov_An-8
WWII German jet night fighter project
longitudinal stability and, in conjunction with the anhedral, contributed to directional stability. Small vertical fins added to the directional stability and
Blohm_&_Voss_P_215
the coning action of conventional adhesion railways to achieve directional stability. This would exclude rack railways and funicular railways. Another
History_of_monorail
Response of a vessel to sea conditions
moment of inertia by shifting ballast can detune resonance. Directional stability, or yaw stability, which affects course-keeping, particularly in bow and
Seakeeping
Automobile handling condition
to maintain the existing path of the vehicle. Braking distance Directional stability Road slipperiness Vehicle handling "UTV Fire Skid Units". Wildfire
Skid_(automobile)
US military fighter aircraft in service 1930-1941
received F4B-4 style vertical fins and rudders to address poor directional stability. F4B-3 (Boeing Model 235) The F4B-3 represented a significant departure
Boeing_P-12
Self-oscillation about an equilibrium that is usually unwanted
hunting or bogie hunting) caused by the coning action on which the directional stability of an adhesion railway depends. It arises from the interaction of
Hunting_oscillation
Motor vehicle
powered equivalent, while its relatively wide 45 inch track aided directional stability on corners. The Series I designation was used from June 1935 in
Morris_Eight
Business jet aircraft
the need for a “stick pusher” stall avoidance device. Increased directional stability, as a result of the Delta-Fins, was also a welcome benefit. However
Learjet_31
Control loop feedback mechanism
on 2011-07-08. Retrieved 2011-04-04. Minorsky, Nicolas (1922). "Directional stability of automatically steered bodies". Journal of the American Society
PID_controller
Prototype attack aircraft developed for the US Air Force A-X program
The aircraft had a large cruciform stabilizer in order to improve directional stability for low-level flight. Split ailerons were fitted that could be used
Northrop_YA-9
American heavy bomber aircraft
NX19901, it was found that two B-17s had already spun from lack of directional stability. British combat experience with the B-17 was also showing the need
Boeing_B-17_Flying_Fortress
Rocket-powered aircraft and spaceplane operated by the US Air Force and NASA
required to give the X-15 adequate directional stability. — Wendell H. Stillwell, X-15 Research Results (SP-60) Stability at hypersonic speeds was aided by
North_American_X-15
Fancy goldfish
roll to the side while moving or at rest, as well as a lack of directional stability. Ranchu goldfish are also susceptible to dropsy, bladder issues
Ranchu
Study of vehicle motion and how it changes
These include: Body flex Body roll Bump steer Bundorf analysis Directional stability Critical speed Noise, vibration, and harshness Pitch Ride quality
Vehicle_dynamics
Single rail land vehicle
braking, which is feasible with a monorail, but would upset the directional stability of a conventional rail vehicle. This has the potential of much shorter
Gyro_monorail
Depth of a vessel below its waterline
cargo), and may ballast further to reduce windage or for better directional stability or seakeeping, or to distribute load along the hull to reduce hogging
Draft_(hull)
Sports car produced by Porsche
PDCC helps the car corner flat and is said to improve high-speed directional stability and outright lateral body control, but according to several reviews
Porsche_911
Rotor mounted on the tail of a helicopter
during cruise flight, forward momentum will often provide some directional stability, as many helicopters are equipped with a vertical stabilizer. The
Tail_rotor
Soviet heavy fighter prototype
summer of 1940 when one of the engines threw a connecting-rod. The directional stability was found to be unsatisfactory so the second prototype (OKO-6bis)
Tairov_Ta-3
Prototype fighter aircraft
XP-81 displayed good handling characteristics except for inadequate directional stability due to the longer forward portion of the fuselage (this was rectified
Consolidated_Vultee_XP-81
1943 twin-engine fighter aircraft family
caused the aircraft to fail carrier suitability trials was poor directional stability with only one engine operational, as well as problems with the tailhook
Grumman_F7F_Tigercat
Experimental fighter aircraft
the control forces were very high at speed and it lacked enough directional stability. Enlarging the vertical stabilizer cured this last problem and hydraulic
Sukhoi_Su-9_(1946)
Watertight buoyant body of a ship or boat
A keel may be fitted on a hull to increase the transverse stability, directional stability or to create lift. Retractable appendages include centreboards
Hull_(watercraft)
Third powered aircraft built by the Wright brothers
stronger, more durable, and with a longer tail to provide better directional stability and control. A larger cylinder bore engine provided more power,
Wright_Flyer_III
Four-engined single-aisle airliner family
modifications were aimed at mitigating Dutch roll by providing more directional stability in yaw. An early JT4A turbojet A later JT3D low-bypass turbofan
Boeing_707
Aircraft configuration in which a small wing is placed in front of the main wing
hdl:2060/19870013196. TM 88354. ...the Flyer was highly unstable... The lateral/directional stability and control of the Flyer were marginal. Garrison (2002), page 85;
Canard_(aeronautics)
American demonstrator aircraft
actuated by push-rods, and the spoil-flaps are hydraulically operated. Directional stability is provided by twin boom-mounted fins, each of 18 sq ft (1.7 m2)
Scaled_Composites_ARES
First jet aircraft of the United States
(common shortcomings of all early turbojets), poor lateral and directional stability at speeds over 290 mph (470 km/h), so that it tended to "snake"
Bell_P-59_Airacomet
Branch of engineering and mathematics
from the original on December 19, 2008. Minorsky, Nicolas (1922). "Directional stability of automatically steered bodies". Journal of the American Society
Control_theory
Dedicated aerial fire fighting airplane
winglets have been adopted on this model for the purpose of improving directional stability. The CL-415 can scoop up to 6,140 L (1,350 imp gal; 1,620 US gal)
Canadair_CL-415
Class of submarines of the Imperial Japanese Navy
instead of the more usual bow-mounted dive planes; this improved directional stability and may have decreased turbulence-induced drag. Reduce the crew
I-201-class_submarine
1946 carrier-based fighter aircraft by Vought
tip on each side of the tailplane in an attempt to improve the directional stability of the aircraft. The fuselage was lengthened to fit additional equipment
Vought_F6U_Pirate
Soviet long-range narrow-body four-engined jet airliner
regarded by pilots and passengers alike, especially for its strong directional stability in high turbulence (although landings are sometimes bouncy), smooth
Ilyushin_Il-62
Anglo-American VSTOL ground-attack aircraft
accommodate the second cockpit. To compensate for the slight loss of directional stability, the vertical stabilizer's area was enlarged through increases in
McDonnell Douglas AV-8B Harrier II
McDonnell_Douglas_AV-8B_Harrier_II
Motor vehicle
out-front than the big bumper approach." Car and Driver said: "Directional stability is so strong on the highway that the Laguna seems locked on some
Chevrolet_Chevelle_Laguna
Israeli prototype jet fighter
capacity, a smooth low-altitude flight attitude, and high levels of directional stability while flown at high angles of attack (AOA). The canard generated
IAI_Lavi
Experimental aircraft in the UK
keen proponent of the tailless approach. He also observed that directional stability was a critical issue without the application of traditional fins
Short_SB.4_Sherpa
Mid-sized automobile
the big bumper approach."[citation needed] Car and Driver said: "Directional stability is so strong on the highway that the Laguna seems locked on some
Chevrolet_Chevelle
Japanese fighter
deliveries took place late in 1931. However, issues arose with both directional stability and centre of gravity, with the result that the type was delayed
Nakajima_Type_91_fighter
British fighter pilot
the P.1B The P.1A was limited to Mach 1.5 because of a lack of directional stability due to insufficient fin area. The original Air Ministry specification
Roland_Beamont
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DIRECTIONAL STABILITY
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DIRECTIONAL STABILITY
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