The
US
engineering
and
science
research
facility’s
$5m
offshore
VAWT
rotor
project
is
exploring
whether
three
key
characteristics
of
vertical-axis
machines
—
their
low
centre
of
gravity,
relative
mechanical
simplicity
and
potential
to
be
scaled
up
to
nameplate
ratings
of
10-20MW
—
could
make
them
a
better
candidate
than
conventional
three-bladed
horizontal-axis
designs
in
water
depths
of
50
metres
or
more.
Government-owned
Sandia
is
concentrating
its
initial
efforts
on
rotors,
focusing
on
the
Darrieus
“egg
beater”
design
and
H-
and
V-shaped
blade
concepts,
while
other
key
technological
components
of
offshore
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