100% American Made -High Quality
World's fastest turning
blades at over 2000 RPM!
Great for direct drive
KT 34.5" blades -
WHAT MAKES OUR BLADES SO SPECIAL?
They lift and push at
the same time -
"The boundary layer
effect on these blades is pure perfection"
Thermodyne KT Pantera blades
made by hydrogenappliances.com lose remarkably little energy
in terms of efficiency. The whole blade is perfection and could
only be described as one big long wind catching 'sweet-spot'
from bass to tip.
The very best electricity
generating turbines are not pushed by the wind so much as they
are pulled. Making electricity needs medium-high RPMs at the
alternator, and blades that are pushed can never go faster than
the true wind speed, usually much slower. These are called "drag
turbines". Good turbines rely on aerodynamic lift to turn
them: the forces involved are greater, and the blades can spin
many times faster than the wind, just as a catamaran can sail
faster than true wind speed.
A blade with tip-speed ratio (TSR) of 5 will spin 50mph in a
10mph wind, creating its own apparent wind of ~51 mph. The apparent
direction of that wind moves closer to the blade's rotational
plane the faster it spins; likewise, the blade tip sees a faster
and shallower apparent wind than the blade root.
As the apparent wind contacts the leading edge, it splits. Some
air goes along the convex back, some goes along the concave front.
The streams adhere to the blade surface and adjacent air by boundary
The concave side air slows down, generating a net positive air
pressure; the air flowing over the convex back of the blade speeds
up, creating a net (and stronger) negative air pressure. Both
sets of pressures act perpendicular to the surface of the blade.
The forces act in all different directions and intensities, but
the net force is a flexing and forward one. The flex force is
canceled by the blade's stiffness; what's left is a forward vector
of surprising strength:
There's a fairly narrow window of apparent wind direction or
attack angle - in which a lifting airfoil will operate efficiently.
The flow along its sides must be smooth, and it must remain attached
to the blade surface. If it detaches, the result is lost lift,
terrible drag, and turbulence, with attendant noise and vibration.
These conditions are known as stalling (attack angle too steep)
and luffing (attack angle too shallow.)
Wind turbine designers have developed numerous strategies to
keep the apparent wind angle correct, which is especially hard
given that different parts of the blade are moving different
speeds, and to keep lift strong and constant along the full length
of the foil. These strategies can be grouped in pairs: Taper
and draft, twist and pitch. Near the hub of a propeller-style-turbine,
the apparent wind is slower and closer in direction to the true
wind, the blade root has a wide chord (breadth) and a fairly
deep draft, and it faces more toward the true wind. The blade
tip is traveling very fast, too much breadth or 'cup' would create
crippling drag, so the blade there tends to be narrower and flatter.
The tip also experiences an apparent wind nearly in line with
its rotational plane, so it needs very little twist.
Finally, the best HAWTs (horizontal-axis wind turbines) are able
to rotate the entire blade to vary TSR, optimize lift, and keep
the alternator spinning at its prime electricity-making RPM.
They use taper, draft, twist and pitch all at once.
For what it's worth a brief look at why the world's best engineers
design HAWTs rather than VAWTs (vertical axis wind turbines).
The very worst VAWTs are pure drag machines: paddles pushed by
the wind. Their maximum apparent wind is the true wind MINUS
their own rotational speed, so they can never go fast and the
wind's force is gutted. And two-thirds of the time, a given blade
is either contributing nothing or plowing headlong INTO the wind.
These generally fall under the heading of Savonius Rotors. Their
TSRs are always less than 1.0, and their efficiencies are gruesome.
Better, though not much, is a class of semi-lifting VAWTs classified
as Darrius, Modified Darrius, or Gyro Rotors. These include the
famous 'eggbeaters' and more modern designs. Almost half the
time, their blades are on or near a "beam reach," moving
perpendicular to the true wind, which sailors know is the fastest,
most-efficient point of sail. But the back blade is operating
in the wind shadow of the front one, its draft must somehow be
inverted, the downwind blade is dragging some, and the upwind
blade is a sea anchor. Darrius blades are pulling maybe 50% of
the time. They aspire to TSRs of 2.5, they do spin faster than
the wind, but not much.
A HAWT experiences great
lift over a 100% power stroke. That's why GE, Mitsubishi, and
Vestas build them that way. Pound for pound and dollar for dollar
HAWT'S are winning the economic battle for cheap and reliable
All blades MUST be mounted
on our tilting or tilted bracket types to keep clearances to
mounting pole at a safe
distance! DO NOT mount these on other manufactures wind turbines!
Large 34.5" Long Blades can generate
lots of rotations in mild and dirty wind
These are weighed sets
that are balanced to run smooth. NO HUB.
- 3 Blade Balanced Pack
Buy ONE set for only $ 75.95 Plus $22.98 S&H -
- 5 Blade Balanced Pack
Buy ONE set for only $139.95 Plus $25.98 S&H -
- 7 Blade Balanced Pack
Buy ONE set for only $153.95 Plus $34.98 S&H -
- 9 Blade Balanced Pack
Buy ONE set for only $194.95 Plus $39.98 S&H -
BULK - 24 BULK Blade Pack
Buy ONE set for only $449.99 Plus $46.98 S&H - Only $18.70
NOTE: These blades are BULK
and not balanced or
matched to be the same weight as it takes considerable time and
You will have to find matching
sets and this may require buying many blades to find matching
THE LOW WIND
5 big blades makes turbines
work so much better for ultra low wind zones!
Wind Turbine Propeller
Sets With Round Hub / Lots of low end torque!
Large 74" Diameter can generate
2000 Watts or more depending on PMA efficiency.
We recommend using
the 2.5" bracket kits with these big blades LINK HERE
Weighed and balanced
We do not sell individual
blade sets MUST be
sold in balanced
sets inorder to run
smooth and not vibrate.
set #KT5BH - 5 X 34.5" KT blades with hub and bolts $149.95
Plus $22.98 S&H -
set #KT6BH - 6 X 34.5" KT blades with hub and bolts $179.95
Plus $22.98 S&H -
set #KT7BH - 7 X 34.5" KT blades with hub and bolts $199.95
Plus $29.98 S&H -
set #KT9BH - 9 X 34.5" KT blades with hub and bolts $229.95
Plus $33.98 S&H -
CLEAR KT Blades (34.5"
Weighed and balanced
set! Not sold separately.
We do not sell individual
sets MUST be balanced to run smooth.
KT CLEAR Blades (34.5")
ONE set of 3 Blades #KT3C - Set of 3 Blades (34.5") for
only $79.95 Plus $24.98 S&H -
ONE set of 5 Blades #KT5C - Set of 5 Blades (34.5") for
only $139.95 Plus $25.98 S&H -
ONE set of 7 Blades #KT7C - Set of 7 Blades (34.5") for
only $153.95 Plus $34.52 S&H -
ONE set of 9 Blades #KT9C - Set of 9 Blades (34.5") for
only $194.95 Plus $39.52 S&H -