Item 1491

DESIGN: Single-Bladed All Electric Rotor- Power Train - Crown & Pinion

Drawing:

This is the one. This is also the drawing considered for

OTHER: Helicopter - Inside - Side-by-Side - Single Blade Rotors - Hub #1

OTHER: Helicopter - Inside - Interleaving - Electric Ultralight & UAV

_________________________________

This is also the drawing considered for

OTHER: Helicopter - Inside - Side-by-Side - Single Blade Rotors - Hub #4

OTHER: Helicopter - Inside - Interleaving - Electric Ultralight & UAV

Final Pinion and Gear Reduction:

 FORM: Arrow Bevel Gear Selection.

 

 

basic Arrow gear 10 PD

basic Arrow gear 8 PD

 

 

 

10P45L15 & 10P15R45

8P45L15 & 8P15R45

 

 

 

Item 0226 & 0227

Item 0143 & 0144

 

 

OD of gear

4.492

5.627

"

 

Bore of pinion

5/8

3/4

"

 

Horsepower:

15

20

hp

 

Pinion Speed:

1680

1680

rpm

 

Pinion Working Torque:

563

1115

in-lb

 

Estimated Rated Pinion Torque:

1125

2232

in-lb

 

Catalog Rated Pinion Torque:

540

968

in-lb

 

Catalog Pinion Pitch Diameter:

1.5

1.875

in

 

Pitch Line Velocity:

660

825

ft/min

 

Dynamic Factor:

0.8673

0.8549

 

 

Allowable Pinion Torque:

468

827

in-lb

 

Service Factor:

0.832

1.10

:1

 

FORM: Hamilton Bevel Gear Selection.

 

 

10 PD

10 PD

10 PD (2)

8 PD

 

 

 

15 / 45 teeth

12 / 48 teeth

15 / 60 teeth

15 / 45 teeth

 

 

 

Item 0226 & 0227

Straight tooth

Bevel tooth

Item 0143 & 0144

 

 

Pinion Speed

1680

2240

2240

1680

rpm

 

Catalog Pinion Pitch Dia.

1.5

1.2

1.5

1.875

in.

 

Pitch Line Velocity

660

704

880

825

ft/min

 

Diametral Pitch

10

10

10

8

 

 

Face Width

0.6875

.625

.6875

1.125

in

 

Allowable Contact Stress

200,000

200,000

200,000

200,000

Steel Rockwell C55 min.

 

Allowable Bending Stress

30,000

30,000

30,000

30,000

Steel Rockwell C55 min.

 

Elastic Coefficient

Pinion & Gear - Steel

Pinion & Gear - Steel

Pinion & Gear - Steel

Pinion & Gear - Steel

 

 

Load Distribution Factor

One member straddle mounted

One member straddle mounted

One member straddle mounted

One member straddle mounted

 

 

Geometry Factor [I]

.119

.069

.143

.119

 

 

Geometry Factor [J]

.247

.220

.292

.247

 

 

Durability

10.7 | 11.9 (1)

N0 good

17.1

19.7

hp.

 

Strength

15.5 | 17.3 (1)

N0 good

24.4

27.1

hp.

 

Durability Service Factor

0.71 | 0.79 (1)

 

 

0.99

 

 

Strength Service Factor

1.03 | 1.15 (1)

 

 

1.35

 

(1) Second value is if both members are straddle mounted.

(2) This looks the best from the perspective of; greater horsepower, small planetary gearbox, and larger diameter crown for additional room. It will be a special for Arrow Gear but can be made with helical gears. Rush Gears Inc. shows a 4:1 straight tooth with 15/60 teeth and pitch of 10.

 

Comparison:

 

Mini-500:

1 seat Talon

2 seat Voyager

 

Durability SF:

0.61

0.33

 

Strength SF:

0.71

0.38

 

Kaman K-Max:

X-shaft Intermediate reduction

 

Durability SF:

0.90 (2)

 

Strength SF:

1.02 (2)

(2) Some of the workup are estimations.

Note that the ElectroLite uses an electric motor, which has a lower shock value than an internal combustion engine.

Notes:

Handing: Consider handing the gears so that the force on the pinion is inward; opposing the centrifugal force. However, will this cause a problem with the force on the crown adding to the force of the thrust? I think that optimizing the crown may be the more important of the two if there is a decission.

Additional Related Information:

Note the, what appears to be the low, service values on the K-MAX and Mini-500.

OTHER: Helicopter - Outside - Intermeshing - Kaman - K-MAX ~ Transmission

OTHER: Helicopter - Outside - Single (1seat) - Revolution - Mini-500 ~ Transmission

OTHER: Mechanical - Gear Bevel

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Last Revised: July 24, 2006