A

B

C

D

E

F

G

H

I

J

K

L

M

A

O

POWER:

P = π/2 * r² * v³ * ρ * η,

https://rechneronline.de/windkraft/

2

change numbers here

total

Reduction to

Efficency

3

P (power)

π/2

Radius R

Amb. Wind Speed

Density air

Efficency

Circle /

% of Area

Wind Speed @ smaller area

Factor

Aera smal

R Small

Blade length

4

KW

3,141593

1,25

3

kg/m³

percent

Ring

R-(d5) r small

5

Windspd m/s³

(from Betz limit)

AREA

6

32

1,571

1,6

27

1,2

40%

4,91

100%

3,00

1,00

7

39

1,571

1,4

37

1,2

40%

4,42

90%

3,33

1,23

0,49

0,40

0,85

8

50

1,571

1,3

53

1,2

40%

3,93

80%

3,75

1,56

0,98

0,56

0,69

9

65

1,571

1,1

79

1,2

40%

3,44

70%

4,29

2,04

1,47

0,68

0,57

10

88

1,571

0,9

125

1,2

40%

2,95

60%

5,00

2,78

1,96

0,79

0,46

11

127

1,571

0,8

216

1,2

40%

2,45

50%

6,00

4,00

2,45

0,88

0,37

12

199

1,571

0,6

422

1,2

40%

1,96

40%

7,50

6,25

2,95

0,97

0,28

13

353

1,571

0,5

1000

1,2

40%

1,47

30%

10,00

11,11

3,44

1,05

0,20

Windspeed converter

m/s

km/h

mph

3,00

10,80

6,71

d=SQRT D²-(4A/pi)

Flächeninhalt: A = π • (rg² - rk²)

unprotect sheet: power