n
u
m
b
e
r
o
f
b
l
a
d
e
s
2
3
4
5
6
7
w
i
d
t
h
o
f
b
l
a
d
e
s
0
.
1
t
u
r
n
0
.
1
o
p
a
c
i
t
y
0
.
5