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In aeronautics, inertia coupling, also referred to as inertial coupling and inertial roll coupling, is a potentially catastrophic phenomenon of high-speed flight which caused the loss of aircraft and pilots before the design features to counter it (e.g. a big enough fin) were understood. It occurs when the inertia of a heavy fuselage exceeds the ability of the aerodynamic forces and moments generated by the wing and empennage to stabilize the aircraft. The problem became apparent as jet fighter aircraft and research aircraft were developed with narrow wingspans, that had relatively low roll inertia, caused by a long slender high-density fuselage, compared to the pitch and yaw inertias.

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  • Trägheitskopplung (de)
  • Inertia coupling (en)
  • Accoppiamento inerziale (it)
  • Couplage inertiel (fr)
  • Traagheidskoppel (nl)
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  • Mit Trägheitskopplung bezeichnet man eine Instabilität bei Flugzeugen, deren Masse um die Längsachse konzentriert ist in Verbindung mit einer zu geringen Richtungsstabilität. (de)
  • Le couplage inertiel est un phénomène survenant lors de vols à haute vitesse lorsque l'inertie due au poids du fuselage prend le pas sur les forces stabilisatrices engendrées par la voilure et l'empennage de l'appareil. Ce phénomène peut déclencher une perte de contrôle et a été à l'origine de crashs lors des premiers vols supersoniques (crash du Bell X-2 serial 46-674 ayant couté la vie au capitaine Milburn G. Apt le 27 septembre 1956). Ce problème apparait avec la mise en service des premiers monoréacteurs à ailes trapues à cause de la différence entre la faible inertie en roulis (dû à une voilure mince et de faible envergure donc légère) et la grande inertie en lacet et tangage engendrée par un fuselage long, mince et dense. (fr)
  • L'accoppiamento inerziale è un fenomeno fisico di instabilità che si manifesta tipicamente su aerei da caccia con una modesta apertura alare ed un'alta velocità angolare di rollio, dovuto alla prevalenza degli effetti relativi ai momenti d'inerzia sulle forze aerodinamiche stabilizzatrici di ali ed impennaggi. (it)
  • Traagheidskoppel is een potentieel gevaarlijk fenomeen tijdens het uitvoeren van vluchten met hoge snelheid, waarbij de traagheid van de relatief zware romp de stabiliserende factoren van vleugels en staart te boven gaat.Het probleem kwam aan het licht toen men begon met tests van gevechtsvliegtuigen met een enkele motor, een kleine spanwijdte, een slanke romp met hoge dichtheid en daardoor een lage inertie voor rollen ten opzichte van die voor stampen en gieren. (nl)
  • In aeronautics, inertia coupling, also referred to as inertial coupling and inertial roll coupling, is a potentially catastrophic phenomenon of high-speed flight which caused the loss of aircraft and pilots before the design features to counter it (e.g. a big enough fin) were understood. It occurs when the inertia of a heavy fuselage exceeds the ability of the aerodynamic forces and moments generated by the wing and empennage to stabilize the aircraft. The problem became apparent as jet fighter aircraft and research aircraft were developed with narrow wingspans, that had relatively low roll inertia, caused by a long slender high-density fuselage, compared to the pitch and yaw inertias. (en)
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  • Mit Trägheitskopplung bezeichnet man eine Instabilität bei Flugzeugen, deren Masse um die Längsachse konzentriert ist in Verbindung mit einer zu geringen Richtungsstabilität. (de)
  • In aeronautics, inertia coupling, also referred to as inertial coupling and inertial roll coupling, is a potentially catastrophic phenomenon of high-speed flight which caused the loss of aircraft and pilots before the design features to counter it (e.g. a big enough fin) were understood. It occurs when the inertia of a heavy fuselage exceeds the ability of the aerodynamic forces and moments generated by the wing and empennage to stabilize the aircraft. The problem became apparent as jet fighter aircraft and research aircraft were developed with narrow wingspans, that had relatively low roll inertia, caused by a long slender high-density fuselage, compared to the pitch and yaw inertias. The term inertia/inertial coupling referring to divergence during a rolling maneuver has been described as misleading because the complete problem is one of aerodynamic as well as inertia coupling. Contributions to the maneuver are complex and include inertial coupling, aerodynamic coupling and the inertia ratios about the three axes, all of which occur simultaneously. However, inertial coupling has also been defined as essentially a gyroscopic effect, i.e. a tendency of a fuselage, when rolled rapidly, to swing away from the direction of flight and become broadside to the wind, and analyzed as such by Phillips. Inertial roll coupling has been defined as a resonant divergence in pitch or yaw when roll rate equals the lower of the pitch or yaw natural frequencies. (en)
  • Le couplage inertiel est un phénomène survenant lors de vols à haute vitesse lorsque l'inertie due au poids du fuselage prend le pas sur les forces stabilisatrices engendrées par la voilure et l'empennage de l'appareil. Ce phénomène peut déclencher une perte de contrôle et a été à l'origine de crashs lors des premiers vols supersoniques (crash du Bell X-2 serial 46-674 ayant couté la vie au capitaine Milburn G. Apt le 27 septembre 1956). Ce problème apparait avec la mise en service des premiers monoréacteurs à ailes trapues à cause de la différence entre la faible inertie en roulis (dû à une voilure mince et de faible envergure donc légère) et la grande inertie en lacet et tangage engendrée par un fuselage long, mince et dense. (fr)
  • L'accoppiamento inerziale è un fenomeno fisico di instabilità che si manifesta tipicamente su aerei da caccia con una modesta apertura alare ed un'alta velocità angolare di rollio, dovuto alla prevalenza degli effetti relativi ai momenti d'inerzia sulle forze aerodinamiche stabilizzatrici di ali ed impennaggi. (it)
  • Traagheidskoppel is een potentieel gevaarlijk fenomeen tijdens het uitvoeren van vluchten met hoge snelheid, waarbij de traagheid van de relatief zware romp de stabiliserende factoren van vleugels en staart te boven gaat.Het probleem kwam aan het licht toen men begon met tests van gevechtsvliegtuigen met een enkele motor, een kleine spanwijdte, een slanke romp met hoge dichtheid en daardoor een lage inertie voor rollen ten opzichte van die voor stampen en gieren. (nl)
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