1751

Item 1751

OTHER: Helicopter - Inside - Intermeshing - Electrotor-SloMo

For OTHER: Helicopter - Inside - Intermeshing - Electrotor-SloMo - Test Stand see 0070.html

Objective:

To locate two ELECTROTOR-SloMo Principal assemblies on a frame that creates an Intermeshing arrangement.

T o initially design and build as a MicroLite craft with the above Intermeshing frame mounted on tripod supports. This arraignment will provide the best Thrust to Empty-weight ratio, which is necessary due to the current limitations of electricity storage.

Pictures: Preliminary Mockup of two Principal Assemblies, Intermeshing Frame and Tripod Support:

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Assembly Drawing ~ Not yet.

Bill of Material 1751

Intermeshing Frame w/ Hub-B and Tripod Supports:

Helicopter - Disk and Power Specifications for Intermeshing Configuration

Drawing of Hub-A:

Drawing is partial from 1751_4.dc

The rotors now have a proposed radius of 6'-0" R and a stagger between rotors of 18"

The intention is to interlock them electrically and mechanically. ~ DESIGN: Electrotor-SloMo - Rotor - Synchronization - Electrical-Mechanical

A general representation of the arraignment: To eventually be removed.

Interleaving

Intermeshing

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Overview:

Electrotor ~ SloMo; Radial Flux Permanent Magnet motors.

With parallel (but isolated) wiring double or triple redundancy can be incorporated in the; batteries, power circuit and motor. .

The extreme rigidity of the rotor blades and the 6º precone angle allows the rotors to have a reduced axis angle between them.

Hopefully, [Blade Pitch Control] can also be incorporated.

Cyclical control by Direct Control, supplemented by Weight-Shift

Collective control by hand grip throttle.

Yaw: Rudder? Reference Opposed longitudinal cyclic (twist frame about Y-axis) for Interleaving.

For information on yaw control see DESIGN ~ Electrotor-SloMo ~ Control Flight - Weight-Shift - Yaw

Autorotation by automatic entry, with capacitor assisted flare at landing.

Powered by a pair of electric motors, which have 1:1 rpm relationship and direct coupling to their counterrotating rotors. ElectrotorSloMo.

The mechanically separated motors will allow the rotor-motor assembly to be used in any small recreational twin-rotor helicopter. ~ September 18, 2009

Cyclic Force by the Pilot: For the same effective disk area, the intermeshing may have smaller rotor disk and this may result in a slightly lower pitch-change force by the pilot and a higher roll-change force by the pilot.

Tripod: For more information see: OTHER: Helicopter - Inside - Interleaving - SloMo on Tripod

Motor:

A slow speed electric motor that is located in each of the two aero-rotors.

Synchronization of Rotors:

For physical intermeshing backup consider having the two or three blades intermesh at the root instead of large teeth on the OD of the hubs.

Cooling Downwash (on newest drawing above ~ 1751_4.gif):

Using the data in the table on DESIGN: Electrotor-SloMo ~ Rotor - Disk - 2 Blades v.s. 3 Blades;

At the midpoint between the rotors, with an 18" stagger, and airspeed of 60 mph, the tangential velocity will be -37 fps.
Over the center of the other rotor, with an 18" stagger, and airspeed of 60 mph, the tangential velocity will be +15 fps.
Over the closest of the stator coils on the other rotor (at 13"R), with an 18" stagger, and airspeed of 60 mph, the tangential velocity will be -12 fps. This means that the coils in close proximity to the other rotor (i.e near to 270º azimuth) will receive little forced-air cooling in hover and in forward flight.

Power Sources:

One heck of a lot of high performance (yet to be developed) batteries. With today's technology the flight time would be logged in minutes.

Generator driven by small (yet to be developed) turbine.

Ground tether containing electrical cable.

Large lightweight Ultracapacitor(s) for flare at the end of autorotation. Could be charged by rotors during autorotation.

Capacitors are very light weight. In fact, there is consideration for using the honeycomb core in a composite construction fuselage as a capacitor/battery.

Principle Assembly for this craft; Electrotor-SloMo ~ Power Storage Devices

Stability:

Have a large coning angle of 6 degrees.

To give static stability in forward flight. I.E. to cause the disk to want to tilt back.
To allow the intermeshing rotors to be located closer to each other.

Control:

Principle Assemblies for this craft; Control - Flight, Control - Electric

Consider using patent US 5,043,641. Have hard copy.

Related Pages:

A Related Patent:

4,311,080 US ~ Drive mechanism ~ January 19, 1982 ~~ circular linear induction

UAV:

This small (25 employee) Canadian company interesting. http://www.micropilot.com/. There is an article on it in the business section May 30, 2006 Globe and Mail.

Rotor:

Rotorhub:

An idea that is intended to assure that the rotors disks have a small gap while not clashing with each other. xx

Blade:

The blades should be very lightweight and asymmetrical (VR-7).

Control:

Motor power and control to be two or three totally independent systems for redundancy.

Collective by power change and torque-pitch coupling. Electrotor-SloMo - Control - Flight - Auto-Collective by Torque-Pitch Coupling.

Principle Assembly for this craft; Electrotor - SloMo

Power Storage:

Have a battery pack that can be dropped during autorotation so as to reduce the disk loading and therefor the descent rate. Consider having a capacitor pack that stays with the craft to be used during flare.

Electrotor-SloMo ~ Power Storage Devices

[Source ~ MDD p.20] Discuses Drag and Flapping Pivots

[Source ~ MDD p.122] Figure 12 shows coincidental drag and flapping Pivots.

Transportability:

Trailer: A fully assembled intermeshing unit c/w frame, two rotorheads and six blades etc. will fit diagonally in a width of 6' and a height of 4' 6", if the disk radii are 5 feet. Slightly larger disk radii will fit in a slightly larger, but transportable. area. The three legs will have to be transported unattached.

The ideal situation will be to have the blades easly removable and installable, but for development the above will work.

Pivot Down Blades.gif: This does not apply to the above trailer.

Drawing is partial from 1751_4.dc

A proposed means for collapsing the craft for storage and ground transportation.

Vibration:

Overhead Control Arm:

OTHER: Aerodynamics - Vibration - Rotor Induced - Analysis of Twin Rotor Helicopters

Possibly Related Subjects:

Overhead Control Arm:

Consider making the bar from fiberglass tubing, or other material with elasticity, At a specific frequency, the overhead arm may negate much of the 2P vibration from the rotor during large cyclic positions.

Initially displayed: August 22, 2009 ~ Last Revised: October 27, 2011

The above utility invention is openly and publicly disclosed on the Internet to negate an entity from patenting it, to the exclusion of all others whom may wish to use it. ~ Reference patent law 35 U.S.C. 102 A person shall be entitled to a patent unless - (a) the invention was known ... by others in this country, ..., before the invention thereof by the applicant for patent.