Item 1571
DESIGN:
Electrotor-Simplex ~ Rotor - Hub - Overview of Gimbaled w/ Torque Collective B
Related Information:
Information on the Gimbaled Hub ~ Electrotor-Gimbaled ~ Rotor - Hub - Gyrobee Information
For a somewhat similar idea see; US 5,304,036 ~ Autogyro aircraft Groen.
Drawing:
The two modifications from the basic gyro rotorhead are;
- The pitch hinge will become two separate hinges, on a common axis, except that there will be a space between these hinges where the motor-reducer will be located. The roll hinge will be split in the same manner as the pitch hinge, for the same reason. Using the above picture as an example, the whole assembly from the rotor bearing down to the lower plates will be opened up to accommodate a 4" diameter motor and planetary reducer, which will both move with the rotorhead.
- The thinking is to make the hub-bar of composite material. It will act as a tension-torsion strap and thereby allow the torque between the gearbox and the rotor to set a 2-position blade pitch mechanism.
- Cyclic control is by conventional gyrocopter offset gimbaled rotorhead plus torque driven collective.
- The idea for the torque driven collective is to have a hub-bar that will on bend inplane or out-of-plane but can twist about the it's longitudinal axis (blade's pitch axis). The hub bar is supported by a conventional pair of teetering stands that teeter on a stub mast. Inside the stub mast is another mast , which actually rotates the rotor head.
- The torque-pitch collective eliminates the 3rd control rod. In addition it automatically puts the rotors into autorotation should the power-train stop producing torque.
- The idea is to have two pair of teetering bars for each of the two rotors. One bar (the hub-bar) takes the centrifugal force of the blades and provides the lift to the craft stands rotate independently about the teetering axis. The other teetering bar applies the torque to its rotor. This torque is applied through a pitch horn. The first hub-bar is make in an elastomer composite construction and this provides resistance to the movement of the pitch horn.
- For information on the torque-pitch collective see;
OTHER: Miscellaneous - Thoughtless Ideas - Auto-Collective Rotor Hub.
- For hub-bar see;
Electrotor-Simplex ~ Rotor - Hub - Overview of Composite Hub-bar
Flight-Control Notes Re Gyroscopic Precession:
Unlike 1566.html, the gyroscopic precession of the motor should have minimal cross-coupling feed-back on the pilot's flight controls.
Pitch Input: There will not be any cross-coupling fro GP since the pitch axle is parallel with the motor axle.
Roll Input: The GP will be normal to both the pitch and the roll axles. It's moment will therefore be countered by the complete craft and not the control linkage.
Yaw Input: It appears that this will attempt to impart a roll into the craft, however the roll is in the same direction as the yaw. This roll could probably be removed in the mixer box and it may be done by 'lengthing' the roll rod therby allowing the pilot to hold the cyclic stick steady.
Collective (torque) Input: The application of torque MAY want to pitch the rotor up slightly
Notes:
Should this arraignment be unsatisfactory many of the components, including the crown and pinion, can be utilized in a spider or 'rods-in-hub' control.
The primary reduction must be, belt & sheave, ring and spur, or planetary so as to have the correct rotational direction of the motors.
The motor should be located at rotors 90º azimuth so that its elevation will not be a problem because the blades are restrained from flapping down at 90º.
Consider locating a fixed azimuth hub spring at approximately 235º azimuth to assure that the blades cannot hit the spars or pilot.
Adjustable pitch stops are located in the hub-bar to set the limits of upward and downward pitch. This way the default position is fixed for autorotation and a perturbation cannot put an excessively high pitch into the blades.
In addition, perhaps the offset on the offset-gimbal head will counteract an attempt by a perturbation to put an excessively high pitch into the blades.
Also see; DESIGN: Electrotor-Simplex ~ Rotor - Hub - Overview of Composite Hub-Bar
The collective will be by electrical thumb control on the cyclic stick. This leaves one hand free.
Concerns:
Vibration - Rotor Induced:
The operation depends on varying the collective pitch by varying the rotor RPM. This varying rpm will very likely result in sympathetic (self-exciting) vibrations in the frame and long spars. If desired the torque pitch mechanism could be replaced by a collective mechanism, up the center of the crown gear.
In addition, the changing difference in the rpm of the two rotors will probably add to this problem. Can encoders and a controller be used to keep the rpm of both rotors the same?
In addition, see the concerns on the linked page; OTHER: Miscellaneous - Thoughtless Ideas - Auto-Collective Rotor Hub
Cyclical Coriolis:
- Teetering of the blades will cause the rotor to want to accelerate. Will this reduce the torque applied by the powertrain to the rotor and thereby result in a lower pitch when the blades are in a teetered (flapped) position?
Future Consideration:
Put pitch, roll, yaw and torque (collective) into an electronic joy stick.
Other Web Page at this Site on Auto-Collective ~ Torque Pitch
Note: The total weight, which varies according to the weight of the pilot, will probable effect the RRPM-Pitch-Torque balance. Can it be pre-flight adjustable to suit each flight?
OTHER: Miscellaneous - Thoughtless Ideas - Torque/Pitch Collective Rotor Hub
OTHER: Miscellaneous - Thoughtless Idea - Constant Speed Rotor
OTHER: Flight Dynamics - General - Cross-Coupling # Torque-Pitch
OTHER: Flight Dynamics - General - Lead-Flap Coupling, for Intermeshing Rotors & Pitch-Lag Coupling
OTHER: Flight Dynamics - General - Pitch-Lag Coupling
DESIGN: Single-Bladed All Electric Rotor- Rotor Hub - Pitch-Torque Coupling
DESIGN: Electrotor-Simplex ~ Rotor - Hub - Overview of Gimbaled w/ Torque Collective B
DESIGN: Electrotor-Simplex ~ Rotor - Hub - Overview of Gimbaled w/ Torque/Pitch Collective & Teetering Drive:
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Initially displayed: September 29, 2007 ~ Last Revised: March 28, 2009
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