Item 0812

OTHER: Helicopter - Inside - Coaxial - Electric Motor Located in Rotors

SloMoCo (Slow Motor ~ Coaxial Configuration)

This page maybe changed to that of simply mounting a couple of ELECTROTOR-SloMo Principal assemblies (motor & rotor) together on an small internal frame. ~ January 18, 2010

Objective:

Drawing:

Overview:

Drawing:

 

The current objective is to go with 'absolutely' rigid rotors backpack as above. Not the below.

 See 1751.html for the similar idea in Intermeshing configuration.

 

Reconsider the layout below.

Consider using one spread 45º-delta3 in the center, two 30º-delta2s at there current locations and the CVJw/HS attached to the mast and the motor's stator.

    1. The decone reduces some cross-couplings. Note the precone should probably not be negative since this might result in the coning angle being negative when operating under loading less than 1G. Have the hub-bar level, which will result in a positive coning angle in autorotation without an undersling but this should be OK for this infrequent event.
    2. The delta3 aerodynamically forces the tip-path-plane to align with the control-plane.
    3. The delta2 provide the torque-pitch coupling.
    4. The single CVJw/HS provides the additional (weight-shift) control power.

Review the cross-couplings of everything.

See Alternatives A & B below re using the preferable two rotors and one stator.

Motor:

See; DESIGN: Electrotor-SloMo - Motor - Overview - 4-phase for SloMoCo (and Bilateral?)

Power Sources:

  1. 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.
  2. Generator driven by small (yet to be developed) turbine.
  3. Ground tether containing electrical cable.
  4. Large lightweight Ultracapacitor(s) for flare at the end of autorotation. Could be charged by rotors during autorotation.
  5. Capacitors are very light weight. In fact, there is consideration for using the honeycomb core in a composite construction fuselage as a capacitor/battery.
  6. Principle Assembly for this craft; Electrotor-SloMo ~ Power Storage Devices

Stability:

Control:

Related Pages:

A Related Patent:

A Somewhat Similar Method:

An associated Concept - Perhaps:

Control and UAV:

Idea Related to 2-phase:

Idea Related to 4-phase:

Concerns:

Rotor:

Rotorhub:

Blade:

Control:

Drawing:

Alternative A - Hub-Spring?:

 

Alternative B - Bi-teetering:

Alternative C - Aerodynamically Active Blade Twist:

 

Workup:

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

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

Related Subjects:

Damper on Rotor Hinges:

Should dampers and/or very strong springs be incorporated into the connecting rods on the bi-teetering rotor heads?

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.

Cyclic Range:

Would a larger range of freely-teetering cyclical movement be better than a shorter range with the control (and associated force and vibration)?

Related Pages:

Alternative Drive:

Introduction Page | SynchroLite Home Page | Electrotor Home Page | UniCopter Home Page | Nemesis Home Page | AeroVantage Home Page:

Initially displayed: April 21 2003 ~ Posted on PPRuNe: May 15, 2004 ~ Last Revised: January 18, 2010

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.