DESIGN: Single-Bladed All Electric Rotor- Rotor Hub - Pitch-Torque Coupling

• The pitch torque is created at the end of the counterweight arm(s), where they attach to the motor - planetary reducer Assembly.
• This device is (torque resistor ((spring)) and damper) is located inboard of the planetary gearbox. A reason for this location is to concentrate weight at the end of the arms and thereby reduce the length of the arms, and thereby reduce the profile drag created by rotational velocity.
• A composite tube with very high torsional resistance will extend from the pitch bearing containment portion of the hub housing to this pitch torque device. This device will be conected to this tube and the pair of counterweight arms.
• A damper will probably be required, but it must not resist the 1P, or perhaps higher harmonic' cyclic control. The twist frequency of the motor-blade arm must be compared with the RRPM.
• See also; DESIGN: ~ Single-Bladed All Electric Rotor - Flight & Power Control ~ Pitch-Torque Coupling
• OTHER: Miscellaneous - Thoughtless Ideas - Auto-Collective Rotor Hub

• The input shaft to the final crown and pinion gear reduction will be the ideal place for the torque-pitch coupling since the strong torque of the motor plus initial reduction and the strong resistance of the 'spring' may exceed any perturbation on the pitch. Remember that at times the torque will be low. There will probably be a need for a damper.

Canculations: (initial approximations)

• The maximum torque at the pinion shaft is 46.4 ft-lb.
• The operational pitch range will be -2ºto +15º

• Ideal rotational dampers. http://virtual.cvut.cz/dynlab/courseModeling/node33.html

• Consider using a coil spring for development.

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