Item 1475

OTHER: Helicopter - Inside - Principal Assembly - Electrotor - Simplex -Teetering  

Chosen Arraignment for this Principal Assembly:

Gimbaled w/ Torque/Pitch Collective & Teetering Drive:

Click on the above drawing for a larger view of it.

Once the drawing has opened click on the mouse (magnifying glass) for an even larger view.

BOM for Chosen Electrotor-Simplex Principal Assembly:

Bill of Material 1475 ~ Principal Assembly

See the bottom of this page for all arraignments under consideration.

An option to all of these would be to have 2 'absolutely' rigid rotors with short blades, and a single gimbal in the center between the two rotors.

Calculations re Hover for One of the Two Rotors at GW = 275 lb per rotor:

 

Alternatives: for comparison

A

B

C

D

E

G(5)

 

Motor RPM:

6000

5500

6000

5500

5500

5500

 

Rotor Radius:

8.5 ft

8.5 ft

8.0 ft

8.0 ft

8.67 ft

8.67 ft

 

Disk Area:

227 sq-ft

227 sq-ft

201 sq-ft

201 sq-ft

236 sq-ft

236 sq-ft

 

Disk Loading:

1.21 lb/ft2

1.21 lb/ft2

1.37 lb/ft2

1.37 lb/ft2

1.16 lb/ft2

1.16 lb/ft2

 

Ratio:

12:1

9:1(1)

12:1(1)

9:1(1)

10:1(4)

10:1(4)

 

Tip Speed:

445 fps

544 fps

384 fps

511 fps

499 fps

499 fps

 

Twist:

-6º

-6º

-6º

-6º

-6º

-0º

 

Blade Pitch:

8.9º

6.55º

11.7º

7.6º

7.35º

6.65º

 

Horsepower MT: (3)

10.68 hp

10.68 hp

11.36 hp

11.36 hp

10.5 hp

10.5 hp

 

Horsepower BEMT: (3)

9.94 hp

11.0 hp

10.07 hp

10.95 hp

10.35 hp

13.2 hp(5)
      1. A single stage planetary reducer.
      2. Comparison;
      3. These calculations are based on a half GW of 275 lbs. This is giving a power loading of about 25 lb/hp.?
        1. C & D have less blade and strut weight than A & B
        2. B & D will have slightly lower reducer weight and single stage planetary for less power loss.
        3. The angle of attack on C may be getting to high (11.7 + .75 * -6) = 7.2º
        4. The tip speed on D is fairly fast; particularly for quietness.
      4. Apex Dynamics Inc. Single stage, 10:1 ratio;
        1. The weight of two 1-stage vs. two 2-stage reducers will be about 2 * 4.5 = 9 lbs less. At 20 lb / hp, plus an efficiency of 94% to 97%, this is a total power reduction of approximately 0.45 + 3% of 24 hp = 1.17 hp
      5. This is identical to 'E' except that the aluminum Vortec NACA 0012 5.25" chord blade has been used, wich also has no twist. This will probably be the initial blade for prototyping.

More Notes:

See notes on Side-by-side, as well.

This configuration is not the best for large moments and forces, but since the rotors are teetering they will generated the smallest moments.

Unmanned Arial Vehicle (UAV):

Unmanned Arial Vehicle (UAV). The induced velocity distribution throughout the total disk area should be quite good, particularly during forward flight. This is because the UAV has no need for a central fuselage. There would be a pod below both rotor hubs. In these two pods would be located the engine(s) power trains and payloads. There is no need for active blade twist. The ABC and ARR should improve the induced velocity distribution.

Rotor-Hub and Flight-Control Assemblies Being Considered for this Principal Assembly:

 

Arraignments for Rotor-Hub and Flight-Control:

 

In-Mast Rods:

 

1569

 

 

 

Gimbaled w/ 2-position Collective:

 

 

 

 

Gimbaled w/ Full Collective: Horizontal Motor

1573

1573

 

 

 

Gimbaled w/ Full Collective: Vertical Motor

 

 

 

1563

 

Gimbaled w/ Hydraulic Collective:

 

 

1567

 

Gimbaled w/ Torque/Pitch Collective:

1566

1571

 

 

Gimbaled w/ Torque/Pitch Collective & Teetering Drive:

1574

 

 

 

 

Spider:

 

1565

 

 

 

Swashplate:

1568

 

 

 

 

Arraignments for Power Train:

 

 

 

 

 

Planetary:

 

 

 

 

 

Crown & Pinion:

 

 

 

 

 

Spur Gear:

 

 

 

 

 

Sheave & Belt:

 

 

 

 

Same Page ~ Different Craft: ~ Electrotor-SloMo ~ Electrotor-Plus ~ Dragonfly

Introduction Page | SynchroLite Home Page | Electrotor Home Page | UniCopter-UAV Home Page | UniCopter Home Page | Nemesis Home Page

Initially displayed: July 23, 2006 ~ Last Revised: September 27, 2009

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.