W
W
W
R
R
R
E
E
E
N
N
N
4
4
4
4
4
4
T
T
T
U
U
U
R
R
R
B
B
B
O
O
O
P
P
P
R
R
R
O
O
O
P
P
P
I
I
I
N
N
N
S
S
S
T
T
T
A
A
A
L
L
L
L
L
L
A
A
A
T
T
T
I
I
I
O
O
O
N
N
N
A
A
A
N
N
N
D
D
D
O
O
O
P
P
P
E
E
E
R
R
R
A
A
A
T
T
T
I
I
I
N
N
N
G
G
G
M
M
M
A
A
A
N
N
N
U
U
U
A
A
A
L
L
L
Copyright Wren Turbines Ltd
September 2008