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Electrically Driven Principal Assemblies, where a hub-motor is an integral part of the rotorhead.

Primarily for bilateral, quad and coaxial rotorcraft.

Viable Projects

..Description: C:\Helicopter\Web_Page\Check.gif Description: C:\Helicopter\Web_Page\Check.gif Electrotor - SloMo;

    • A very rigid rotor assembly that incorporates a slow speed electric motor in its hub. The 1:1 ratio eliminates the need for a reducer and other moving components.

..Description: C:\Helicopter\Web_Page\Check.gif.Electrotor - Plus; (Electrotor - Gyro;)

    • Incorporates a 2-blade teetering rotor where there is enhanced flight control due to aerodynamic precession from a rotor, which has hub springs, plus, gyroscopic precession from a high-speed hub-motor.

Less Viable Projects

..Description: C:\Helicopter\Web_Page\Cross.gif Electrotor - Simplex;

    • A simple arrangement, for development purposes, with teetering rotors.

..Description: C:\Helicopter\Web_Page\Cross.gif Electrotor - MicroLite;

    • A simple arrangement, for development purposes, with 'Absolutely' Rigid Rotors.

...,..Electrotor - BladeMotor;

    • Each blade has its own motor that sets pitch and contributes to rotor rotation.

......Single-Bladed All Electric Rotor:

    • A rotor with just one blade.

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    1. The SloMo.
    2. The basic MicroLite craft.
    3. To develop and test larger rotor blades; with torque-pitch coupling (for collective) and then active tip control (for cyclic control assist).
    4. To migrate the electrics up to larger advanced VTOL craft. (perhaps the AeroVantage and/or the UniCopter)

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Increasing Safety through Deconstruction

Starting small, then grow ~

Backpack helicopters are cute, they are funny and they are dangerous.

The following is a serious look at the Backpack helicopter from an unusual perspective.

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The backpack helicopter that incorporates; a coaxial configuration, short span blades, collective by rotor rpm, and cyclic by weight shifting, is probably the most economical helicopter that can be built and the easiest helicopter to fly.

However, critics are rightly concerned that it will be a very unsafe craft due to; the lack of speed stability in forward flight, the inability to autorotate, and the risk of stumbling during a stand-up landing.

The conventional solution to overcome these shortcomings would be to upgrade the wish-list by adding; landing gear, then longer blades, then a collective, then a teetering hinge, and finally a bigger engine and transmission to lift this heavier craft. By this point the craft is much more expensive to build and somewhat more difficult to fly. In addition, all these upgrades add their own reliability concerns.

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As an alternative, consider the possibility of taking a VERY DIFFERENT APPROACH. An approach that might be called 'deconstruction'.

Consider the possibility of producing a safer backpack helicopter by reducing its complexities and thereby increasing its reliability:

    1. Replacing the dozens of wearing engine and transmission parts with a brushless electric motor whose only wearing parts are it's two bearings.
    2. Divide the controller's power circuit, the motor's coils, and the battery packs into two or more totally independent circuits.
    3. Incorporate redundancy and polling into the control circuitry.
    4. The rotor blades are extremely rigid and there are no hinges.
    5. Give the blades (propellers) a 2-position pitch (initially).
    6. Locate the batteries below the torso of the pilot.
    7. Discharging the weighty primary batteries in a worst case scenario.
    8. Provide the pilot with undeniable knowledge of low battery power, plus a controlled reduction in the available power to the motor.


Elaboration on the above numbered points.

2. Should a power circuit fail, the motor will still operate, but at reduced power.[/SIZE]

3. In addition, this simple craft requires very few pilot actuated controls. [/SIZE]

4. To give speed stability during forward flight.[/SIZE]

5. A torque-pitch capability so that the rotor can provide thrust and accommodate autorotation. Disk loading would only be 3-1/5 lb/ft. on a 10 ft dia. [/SIZE]

6. The lower location of the batteries will assist with weight shifting and reduce the weight of the motor-rotor assembly[/SIZE]

7. A lowering or dropping of the batteries will significantly lighten the remaining weight and significantly assist with a controlled landing. Dropped batteries could have their own small parachute incorporated into the battery pack unit.[/SIZE]

8. An ultra-capacitor might be incorporated to provide power during the landing if the battery pack unit has been released. [/SIZE]

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The 'objective' being; absolute reliability, assured power for touchdown, and easy piloting.

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Related Pages - This Site:

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Is Sikorsky Attempting to Inhibit Others from Developing Electric Rotorcraft?


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Intermeshing Information


Flight Dynamics

Helicopters - Outside



Helicopters - Inside



Rotor Concepts:

CNC Workstation

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Last Revised: 14 March 2013