100% American Made -High Quality Product(Not Imported)
turning blades at over 2000 RPM!
direct drive PMA's
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 layer effect.
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
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
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 wind power.
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
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.
#KT3B - 3 Blade Balanced Pack Buy ONE set for only $ 75.95 Plus
$22.98 S&H -
#KT5B - 5 Blade Balanced Pack Buy ONE set for only $139.95 Plus
$25.98 S&H -
#KT7B - 7 Blade Balanced Pack Buy ONE set for only $153.95 Plus
$34.98 S&H -
#KT9B - 9 Blade Balanced Pack Buy ONE set for only $194.95 Plus
$39.98 S&H -
#KT24BUB BULK - 24 BULK Blade Pack Buy ONE set for only $449.99 Plus
$46.98 S&H - Only $18.70 each
NOTE: These blades are BULK
and not balanced or
matched to be the same weight as it takes considerable time
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 blades since
blade sets MUST be sold
sets inorder to run
smooth and not vibrate.
ONE set #KT5BH - 5 X 34.5" KT blades with hub and bolts
$149.95 Plus $22.98 S&H
ONE set #KT6BH - 6 X 34.5" KT blades with hub and bolts
$179.95 Plus $22.98 S&H
ONE set #KT7BH - 7 X 34.5" KT blades with hub and bolts
$199.95 Plus $29.98 S&H
ONE set #KT9BH - 9 X 34.5" KT blades with hub and bolts
$229.95 Plus $33.98 S&H
KT Blades (34.5" NO HUB)
Weighed and balanced
set! Not sold separately.
We do not sell individual
sets MUST be balanced to run smooth.
KT CLEAR Blades (34.5")
Buy ONE set of 3 Blades #KT3C - Set of 3 Blades
(34.5") for only $79.95 Plus $19.98 S&H -
Buy ONE set of 5 Blades #KT5C - Set of 5 Blades
(34.5") for only $119.95 Plus $21.98 S&H -
Buy ONE set of 7 Blades #KT7C - Set of 11 Blades
(34.5") for only $179.95 Plus $39.52 S&H -
Wind turbines experience "PROGRESSIVE
LOSS" or Cascade Failure when under heavy loads. This
means that the slower the rotor spins under load the MORE
likely it is to spin even slower and so on (Cascade Failure)
until the blades are moving so slow they can't catch enough
wind to be effective any longer because of excessive
"Way-Holes". This is why two and three blade systems need a
computer to keep the blades rev'd up to speed. The computer
removes the load by making fast adjustments and this keeps the
blades moving quickly eliminating cascade failure. However a
computer become less necessary when you have lots of blades
working for you since cascade failure is greatly reduced by
having the extra surface area of 6 blades. 3 blades will work
just as good as 6 blades IF the design is 100% perfect. Having
6 blades is an EXTREMELY forgiving system for those of you
experimenting with using motors as generators!
The slower a blade spins the more
likely it is to spin even slower and so on until it can no
longer adequately catch wind as "Way-Holes" form in the
propellers diameter matrix area.
A potential power producing area of a
wind turbine propellers diameter that is allowing air to
pass through in-between blade strikes.
or - The absence of a wind turbine blade in the winds path
at any given point in rotation time usually caused by
over-amperage loads including connection to lower voltage
batteries used in low wind speed areas or high amperage
appliances or lack of blade area in the original turbine
design or a mismatched PMA to blade area ratio in the
design. (Way-Holes are also called 'The Unengaged Blade
IT ALL BOILS DOWN TO THIS ONE SIMPLE
LITTLE QUESTION IN THE END.
The REAL question becomes, WHAT is
cheaper. Extra BLADES or COMPUTER controls???
Well, at least in the case of small wind
turbines it's a no-brainer,, Extra blades are much cheaper
than electronic controls and definitely more dependable too!!
Warning: Please note that these
carbon fiber wind turbine blades are very sharp and can cause
severe injury if handled improperly. Treat these blades with
the same respect you would have for a sharp sword.
These blade sets can turn at well over 2000 RPM on a windy day
and can cause severe bodily injury when they are spinning. Use
extreme caution! Never mount or work on a wind turbine on a
windy day. Never place a turbine in any area that can be
accessed by inexperienced persons or children. We assume no
liability for ANY injuries caused by these products.
Replacement blades for
Southwest Windpower wind seeker types 501, 502, 503, 505
(MUST BE SOLD IN THREE PACKS SO THEY DO
NOT BEND IN SHIPPING!)
These blades are sold 3 per
pack and come in 3 sizes:
42" long and 2.5" wide each. 3
pack is $ 99.95 plus shipping
48" long and 4.5" wide each. 3
pack is $159.95plus shipping
58" long and 4.5" wide each. 3
pack is $179.95 plus shipping
Great for building VAWT vertical axis
wind turbines too. Fast blades offer excellent lift.
Has nice wing shaped foil for
excellent speed a strength.
You will need to trim and drill mounting holes and set pitch
with your own shims. #6 hardened spring aluminum.
Great for making replacement
blades for old Southwest and Windseeker types 501, 502, 503,
Works on virtually all vintage
and newer wind turbines. Shipped taped to a 2 x 4 piece of
lumber. Well packaged.
We take no responsibly for how
these blades are used. You must make sure you drill, install,
balance and back
More Notes from Happy customers:
Date: Thu, 27 Apr 2006 22:35:00 EDT
Dear Bob: I thought I would drop you
a line and let you know about the turbine I ordered from
you, it was to replace a southwest wind power windseeker
503, because it continually trashed the blades, I have gone
through three of their sets of blades, and now they stopped
making and servicing them. As I was assembling the one I
received from you the windseeker was on the bench right next
to it, and just for the heck of it I thought your hub and
blades might go on the windseeker, which it did, I remounted
the wind seeker with your hub and six blades and never saw
it do such a good job, for nine years I have been hiding
from this thing, and now I can stand right underneath it,
your advertisement on your web site is 100% truthful, your
blades turn with very little wind, and they withstand very
high winds, and make very little noise, and virtually no
vibration. I would recommend your blades to anybody that
wishes to improve their current Wind Chargers. I haven't had
a chance to mount your wind turbine yet as I am waiting on
another set of blades. And if anybody wants to know about
your customer service, I would highly recommend them to you,
you always answer your e-mails and are very helpful.
est Windpower wind seeker replacement blades for
CCW spinning blades
If you want your blades
to spin CCW just build a DOWN-WIND turbine design. EASY !