A torque converter for converting torque between an input shaft and an output shaft includes an impeller operably connected to the input shaft and rotatable therewith. The torque converter further includes a turbine operably connected to the output shaft and rotatable therewith. A fluid flow system directs a flow of motive fluid through the impeller and through the turbine to drive rotation of the output shaft relative to the input shaft. A lockup mechanism is engageable to urge rotation of the output shaft at an output shaft rotational speed identical to an input shaft rotational speed. A switching module controls an actuation system to urge engagement of the lockup mechanism.

A torque converter for converting torque between an input shaft and an output shaft includes an impeller operably connected to the input shaft and rotatable therewith. The torque converter further includes a turbine operably connected to the output shaft and rotatable therewith. A fluid flow system directs a flow of motive fluid through the impeller and through the turbine to drive rotation of the output shaft relative to the input shaft. A lockup mechanism is engageable to urge rotation of the output shaft at an output shaft rotational speed identical to an input shaft rotational speed. A switching module controls an actuation system to urge engagement of the lockup mechanism.

A driving device includes a body portion, a driving shaft disposed on the body portion and configured to rotate relative to the body portion, a lock portion disposed on the body portion and including a snap-fitting portion configured to snap with the propeller, and an elastic abutting member disposed on the body portion and configured to be pressed down and deformed along a direction parallel to the driving shaft to abut against a propeller in response to the snap-fitting portion being snapped with the propeller.

A driving device includes a body portion, a driving shaft disposed on the body portion and configured to rotate relative to the body portion, a lock portion disposed on the body portion and including a snap-fitting portion configured to snap with the propeller, and an elastic abutting member disposed on the body portion and configured to be pressed down and deformed along a direction parallel to the driving shaft to abut against a propeller in response to the snap-fitting portion being snapped with the propeller.

A rotor assembly includes a propeller, a motor, and a connection assembly. The motor includes a stator and a rotator rotatable with respect to the stator. The connection assembly is configured to connect the propeller to the motor and includes a locking member that is arranged between the propeller and the motor. The locking member is configured to rotate with respect to the rotator and the propeller in a rotation direction identical to a rotation direction of the propeller in operation to lock the propeller to the motor.

A rotor assembly includes a propeller, a motor, and a connection assembly. The motor includes a stator and a rotator rotatable with respect to the stator. The connection assembly is configured to connect the propeller to the motor and includes a locking member that is arranged between the propeller and the motor. The locking member is configured to rotate with respect to the rotator and the propeller in a rotation direction identical to a rotation direction of the propeller in operation to lock the propeller to the motor.

A seal system for coaxially aligned shafts includes an input shaft and an output shaft coaxially aligned with the input shaft. The seal system includes a seal adapter support housing coupled to the output shaft and a seal positioned between an end of the input shaft and an end of the seal adapter support housing. The input shaft is configured to rotate at a speed that is different than a speed of the output shaft.

A seal system for coaxially aligned shafts includes an input shaft and an output shaft coaxially aligned with the input shaft. The seal system includes a seal adapter support housing coupled to the output shaft and a seal positioned between an end of the input shaft and an end of the seal adapter support housing. The input shaft is configured to rotate at a speed that is different than a speed of the output shaft.

Rotary electric engines, aircraft including the same, and associated methods. A rotary electric engine includes a nacelle, a fan configured to generate thrust, a stator operatively coupled to the nacelle, and a rotor operatively coupled to the fan. The fan includes a plurality of fan blades. The rotor includes a plurality of rotor magnets operatively coupled to respective blade tips of the fan blades. The stator includes a plurality of field coils configured to produce a magnetic interaction between the field coils and the rotor magnets to rotate the fan. In examples, the stator is configured to rotate each field coil relative to the nacelle. In examples, an aircraft includes one or more rotary electric engines pivotally mounted within engine mount regions. In examples, a method of operating an aircraft includes operating one or more rotary electric engines in a vertical lift configuration and in a forward flight configuration.

A power transmission system includes a shaft, a stator disposed within the shaft and substantially concentric with the shaft; and at least one supporting element positioned between the stator and the shaft and configured to support the shaft on the stator to reduce a vibration of the shaft and allow the shaft to rotate relative to the stator. A gas turbine engine including the power transmission system is also described.