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PROUDLY DESIGNED AND ENGINEERED IN THE USA!

Specializing in Hot Water 24/7 from Wind Power
for “On Demand” and Radiant Heating
with Electric Power as a Bi-Product.

Sales

Business-to-Business

Rabbit Tool USA, Inc.

  • Natural sunflower functional look for aesthetic acceptability
  • Installation made simple: two people and a pick-up load of parts and tower
  • One-person hydraulic tilt-up/down tower craneless installation and for owner's ease of inspection and repairability
  • Safety rotor never overspeeds with Slow speed operation less than 3 times wind speed for longevity, quietness and safety.
  • Hydraulic drive for robust reliability with all controls, generators, heat harvesters, etc at ground level.
  • Unparalleled "efficiency " with no hassle zonal acceptable short towers.
  • Designed and manufactured in USA, patent pending.
  • Uniquely produces off-grid on site combined heat and power (CHP) 24/7.
  • WMS-1.5x10

    1.5 m (5 ft.) Diameter Rotor and 10 kW output

    Includes Foundation Kit less cement, 40 ft. Hydraulic Tilt-up Tower with Hydraulic Hand pump, Main Wind Pump and Nucelle assembly, 12 Blades, Power Kart with 1.9kW/24-Volt DC Alternator, Voltage control, Battery charger, 60 Gal “Indirect Water Heater“ with dual heat exchange coils, recharge pump, filter, system rotor shut off plus all automatic controls.

    MODEL #WMS-1.5 x 10
    ($3.00 per rated watt)

    $30,000

  • WMS-2.0x30

    2.0 M (6.5 FT) Diameter Rotor and 30kW output

    Includes Foundation Kit less cement, 40 ft. Hydraulic Tilt-up Tower with Hydraulic Hand pump, Main Wind Pump and Nucelle assembly, 12 Blades, Power Kart with 3kW/24-Volt DC Alternator, Voltage control, Battery charger, 119 Gal “Indirect Water Heater“ with dual heat exchange coils, recharge pump, filter, system rotor shut off plus all automatic controls.

    MODEL #WMS-2.O x 30
    ($2.00 per rated watt)

    $60,000

  • WMS-3.0x100

    3.0 M (10 FT) Diameter Rotor and 100kW output

    Includes Foundation Kit less cement, 40 ft. Hydraulic Tilt-up Tower with Hydraulic Hand pump, Main Wind Pump and Nucelle assembly, 12 Blades, Power Kart with 10kW/110-Volt 60w synchronous generator, Voltage control, Battery charger, 119 Gal “Indirect Water Heater“ with dual heat exchange coils, recharge pump, filter, system rotor shut off plus all automatic controls.

    MODEL #WMS-3.0 x 100
    ($1.00 per rated watt)

    $100,000

My wind machine system most resembles the 19th century American farm wind mill, but I fixed its previous limitations for generating power. Now it has 12 thick, 25% chord, OJB designed high lift, light weight, high surface area aero blades which constructively and instantly interact to uniquely guide the flow through the array, combined with a uniquely simple speed control system that allows it to linearly track the wind, keeping a constant TSR at all wind speeds. While it is quite capable of merely pumping water, we have equipped it to do far more; it can provide both heat and power 24/7 for all your uses. Wind is required, but tall towers not.

Conventional 3-bladed machines require tall towers and non turbulent air flows as any turbulence confronting their naked narrow corded blades instantly puts the blade into stall conditions; constant speed hi inertia rotors only add to the problem. My machine is a variable speed reaction turbine whose blades interact to uniquely guide the flow through the array keeping the flow attached under nearly all conditions. Short towers and turbulent conditions work for us; who needs zoning problems when they can be avoided?

Additionally my machines have four more unique features that mimic extra tower height and/or add to energy capture:

  1. An inverted nose dish that redirects central air flow normally lost, to speed up the average air speed through the blades achieving much the same as a taller tower.
  2. Unique Hoerner's Wing Tip blades that virtually extend the rotor's effective diameter  while decreases the tip vortices,  lowering the drag & increasing the energy harvested much like a shroud or extra tower height does, but less the cost and weight of the shroud/extra tower.
  3. Flow is channeled and accelerated off the blade trailing edges, enhancing the flow of its mating blades, creating what is known as a "Blown Flap Effect" enhancing the Coanda and Katzmayr effects keeping the flow attached during nearly all wind speeds
  4. Staggered tooth blade array which slices into the approaching air stream much like a chain saw to a tree.

Wind, as we all know, is the most fickle of energy sources, its speed bouncing up and down like some erratic, neurotic yo-yo. Yet we like our electrical supply to be steady-eddy 24/7. What is a designer to do? My solution was to have the electrical part of the system max out at say 11-12 mph, near the local average wind velocity, maintaining a very desirable higher electrical "capacity factor" and have all the rest be turned into heat which can be easily stored short-term.  Smaller household size systems have a small hydraulic driven variable speed alternator, ~ 2 KW, for charging batteries connected to an inverter; larger systems additionally drive a synchronous generator for all your electrical power needs 24/7.

As we all know, the wind does not always blow, so the end point of my heating system is a special "indirect" water heater with dual-coil input one coil from my wind machine, the other attached to either a wood stove, solar panel or a concentrated utility gas or electric heat source. End result: seamless electrical power and hot water 24/7 for all your "on demand" or radiant heating as well as electrical power needs.

The 12 wind-driven blades directly drive a large slow-turning hydraulic gear pump,  which is connected via hoses, internal to the tower, in a closed loop with the Ground-Level Power Kart with an alternator/generator , "indirect" water heater,  filter & all controls. We have gears, but no "gearbox" is ever required. An hydraulic drive was chosen as it is approximately 1/10th the size, weight and complexity of the electrical drive it replaces, plus its working fluid, unlike electrons, carries the normally lost heat down to the Power Kart where it may be harvested and stored. Additional this hydraulic system permits an exceptionally simple control system to track the wind, orders of magnitude simpler, more rugged and cost-effective than any competing electrical system, known to the author.

The Nucelle assembly at the very top of the pump has a pressure relief valve with an integral heat exchanger which recirculates excess fluid flow whenever the unit is operating above rated wind speed while allowing continuous power production at the Power Kart even during storms. The Power Kart also includes a shut-off valve to stop the turbine at any time to facilitate repairs, filter changing and/or decommissioning.

RABBIT TOOL - Wind Machine System

Basically this array is a reaction turbine operating above its critical Reynolds number with interacting overlapping blades employing enhanced lift force capabilities. The blade array is truly unique: more blades would cause it to operate below the critical Reynolds numbers, while fewer blades would be too far apart to constructively interact. It thoroughly dispatches A. Betz's theory of limits and routinely exceeds COE (conservation of energy) predictions by an order of magnitude. Finally energy capture capability on my machines increases approximately with rotor diameter cubed vs squared as on all others.

Why and how do I claim that? It is pure geometry, which to my mind is more fundamental than the energy equation. If I add ∆D to D, the increased ∆A, which is proportional to the lift force, increases as D² and the energy harvestable is proportional to this area times the torque arm D + ∆D, or proportional to D³. If, with my design, I can get ~30kW with a 2m rotor at 25mph wind speed, then a 3m diameter rotor I should capture ~100kW, which is the same as the 1970s era NREL Mod 1 machine, but it had a 125' diameter rotor!

Drawings

RABBIT TOOL - Wind Machine System RABBIT TOOL - Wind Machine System RABBIT TOOL - Wind Machine System RABBIT TOOL - Wind Machine System RABBIT TOOL - Wind Machine System RABBIT TOOL - Wind Machine System RABBIT TOOL - Wind Machine System

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Rabbit Tool USA Inc

Rabbit Tool U.S.A., Inc

105 - 9th Street

Rock Island, IL 61201

TEL/FAX (309) 793-4375

ojbirkestrand@rabbittool.com

© 1992, Rabbit Tool Co., Inc. Printed in USA. Patent Pending.
RABBIT TOOL - Wind Machine System

TEL/FAX (309) 793-4375

RABBIT TOOL - Wind Machine System
RABBIT TOOL - Wind Machine System
RABBIT TOOL - Wind Machine System
RABBIT TOOL - Wind Machine System

RABBIT TOOL - Wind Machine System

RABBIT TOOL - Wind Machine System