FORM: Power Train ~ Half-Scale UniCopter

Ratio, HP, Torque & Losses

 

At Maximum Vertical Climb:

At Maximum Forward Velocity:

 

Speed:

 

Power:

 

Torque:

 

Speed:

 

Power:

 

Torque:

 

 

Ratio:

 

Loss:

 

 

 

Ratio:

 

Loss:

 

 

 

[Engine]

5,800

rpm

23.5

hp

21 (1)

ft-lb

5,800

rpm

23.5

hp

21

ft-lb

 

 

 

 

 

 

 

 

 

 

 

 

 

[Prop]

0

 

0

 

0

 

5,800(1)

rpm

1

hp

?

ft-lb

 

 

 

 

 

 

 

 

 

 

 

 

 

Annulus:

9,183

rpm

23.3

hp

13

ft-lb

5,800(1)

rpm

11.6

hp

11

ft-lb

Primary: Belt

1.2

: 1

3.0

%

 

 

1.2

: 1

3.0

%

 

 

Intermediate:

7,734

rpm

22.6

hp

15

ft-lb

4.883(1)

rpm

11.3

hp

12

ft-lb

Secondary: Mid Xshaft(s)

2

: 1

1.0

%

 

 

2

: 1

1.0

%

 

 

X-shaft:

3,867

rpm

22.4

 

30

ft-lb

2,417

rpm

11.2

 

24

ft-lb

Final: At rotorhubs

3.0

: 1

1.0

%

 

 

3.0

: 1

1.0

%

 

 

[Rotors]

1,289

rpm

22.2

hp

90

ft-lb

805 (4)

rpm

11.1

hp

72

ft-lb

[Rotor]

1,289

rpm

11.1

hp

45

ft-lb

805 (4)

rpm

5.5

hp

36

ft-lb

Total:

7.2 (3)

: 1

5.0

%

 

 

7.2 (3)

: 1

5.0

%

 

 

Ratio, HP, Torque & Losses

 

At Maximum Vertical Climb:

At Maximum Forward Velocity:

 

Speed:

 

Power:

 

Torque:

 

Speed:

 

Power:

 

Torque:

 

 

Ratio:

 

Loss:

 

 

 

Ratio:

 

Loss:

 

 

 

[Engine]

5,800

rpm

23.5

hp

21 (1)

ft-lb

5,800

rpm

23.5

hp

21

ft-lb

 

 

 

 

 

 

 

 

 

 

 

 

 

[Prop]

0

 

0

 

0

 

5,800(1)

rpm

1

hp

?

ft-lb

 

 

 

 

 

 

 

 

 

 

 

 

 

Differential:

11,600

rpm

23.3

hp

11

ft-lb

5,800(1)

rpm

11.6

hp

11

ft-lb

Primary: Belt

1.5

: 1

3.0

%

 

 

1.5

: 1

3.0

%

 

 

Intermediate:

7,698

rpm

22.6

hp

16

ft-lb

3,887(1)

rpm

11.6

hp

16

ft-lb

Secondary: Mid Xshaft(s)

2

: 1

1.0

%

 

 

2

: 1

1.0

%

 

 

X-shaft:

3,849

rpm

22.4

 

23

ft-lb

1,933

rpm

11.5

 

23

ft-lb

Final: At rotorhubs

3.0

: 1

1.0

%

 

 

3.0

: 1

1.0

%

 

 

[Rotors]

1,289

rpm

22.8

hp

93

ft-lb

644 (4)

rpm

11.4

hp

93

ft-lb

[Rotor]

1,289

rpm

11.4

hp

46

ft-lb

644 (4)

rpm

5.7

hp

46

ft-lb

Total:

9

: 1

3.0

%

 

 

9

: 1

3.0

%

 

 

 

          1. Q =( hp * 5252) / rpm
          2. The above [Maximum Forward Velocity] columns use an assumed speed distribution between the rotor and the propeller.
          3. With rotor radius of 54" the tip speed will be 456 fps, 0.41 M.
          4. This ratio may be to slow. Perhaps the spider gear may be better.
          5. Note the difference in the rotor speeds at forward velocity for the two differentials. The hover speeds are the same.

Same Page ~ Different Craft: ~ UniCopter

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

Latest revision; August 29, 2007