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Green Steam Engine™

Introducing a new piston steam engine design for stationary and marine applications that is extremely efficient, economical and easy to build. Plans are now available.
(US patent # 6647813) 2003, Green
(US patent pending #12231907 ) 09/08/08, Green
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Power a boat, a generator, air pump, water pump, heating blower, water distiller, heat pump, air conditioner, model airplanes, boats and trains or a variety of appliances with the fuel of your choice including solar. Waste heat from engines may also be used to generate steam to power this engine. Because it is so lightweight and compact, it could be used in vehicles to run pumps on waste heat; saving power and fuel. This powerful, quiet engine is a breakthrough in alternative energy use.
Because of a revolutionary new patented means of converting reciprocating movement into rotary movement, the "Green Steam Engine™" has dramatically simplified the piston engine. A full size engine such as the one in the picture weighs as little as 5 lbs (less flywheel) yet produces ample power to run a boat or a generator. Its amazingly small profile allows it to be used in very small spaces.
Slow motion animation to show how it works
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(note: pump in front of flywheel to recycle condensed exhaust steam)
Steam engines provide advantages such as: less pollution, quiet running, high torque at low speeds, no transmission requirements, runs on a choice of fuels, has long life with low maintenance.
Adding to this list of special advantages, the "Green Steam Engine™" offers these unique features:
  • Runs on very low steam pressure and low volume (freewheels at 2 psi),
  • Costs little to build
  • Nearly zero lubrication requirements
  • Can be assembled or disassembled in minutes
  • Extremely lightweight
  • Few moving parts
  • Boiler requirements are minimal
  • Can run in any position like an electric motor
  • Very small Profile for economy of space
  • May be variably configured for desired power vs. speed requirements
  • Utilizes modern materials and methods previously not applied to steam power.
  • Highly versatile adn elegantly simple.

The properties of the patented crank mechanism (called a "flexible rod transmission") invented by Robert Green, provides this engine with the advantage of eliminating the typical crankshaft and cam that requires lubrication and precision machining. It also provides the unique configuration whereby the cylinders are aligned in the same direction as the main shaft. The result is a compact, lightweight and slim engine that is extremely simple to construct and assemble.
The pistons and valves operate off a short piece of flexible shaft. Because the flexible shaft is fixed and cannot rotate, the piston rods and valve push rod are held in position while being reciprocated. The cylinders float, attached to a swivel ball fitting at their base. Much of the structure and weight of a typical steam engine has been eliminated.
The unique feature of the "Flex Rod Transmission" is that it produces an intermittent movement whereby the valve movement is stopped in its open and closed position during the power and exhaust strokes. This gives prolonged, fully opened valve timing. In compliment, the pistons are held stationary while the valve moves between phases. The output shaft continues rotation while the pistons stand still. The result is that the efficiency is increased dramatically. The overall friction of the engine is reduced due to the small number of light weight moving parts, and the use of ball bearings throughout. The flex rod is nearly frictionless as the flexing is like a spring in which the energy required to flex it is returned in equal amounts.
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This engine may be made in a variety of configurations and sizes. For example, one can change piston size and stroke length in a matter of a couple of minutes. One cylinder may be substituted for an air pump cylinder to provide air or water pumping. It can have one or a plurality of cylinders without increasing the number of bearings. Modern materials and methods have been applied to this steam engine to achieve new results and to bring steam power up to date.
Boat operated with small engine
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A miniature version (below) weighs less than one pound and has amazing power and speed.

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The above multi-purpose engine may be used for small applications such as model airplanes and trains. It may also be use for air-conditioning and refrigeration pumps, as well as air circulation systems. It may be run on air or steam. The engine fits nicely into a tube for compact designs.
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Small Engine Generator
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Click on the link for a video of the above engine
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Water distiller operated by small steam engine
The schematic below shows how to produce up to 24 gallons of distilled water a day, and all the hot water you can use employing an ordinary household pressure cooker on a low simmering fire. This model steam engine operates the system on 4 to 20 psi of steam.

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Commercial Steam Engines
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This three cylinder model features large cylinders that have overlapping phases. It produces smooth torque without a flywheel. This engine is self-starting and is well suited for generators, boats, refrigeration units, heat pumps and stationary engines. A four cylinder double expansion version is available for license as well. The double expansion engine is extremely economical to run. It may be scaled to the size that fits your application. It is also self-starting. These engines may be made with six or eight cylinders as desired.
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Four cylinder model
Manufacturing licenses are available for these commercial engines.

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3 cylinder engine with water tube boiler
Typically, the exhaust steam is condensed and pumped back into the boiler to increase efficiency. A small pump on the engines pump the condensed water into the boiler in a closed loop system. (See above photo)

Click on the "Products" page below to order plans and parts to make a "Green Steam Engine".
Look on "Licenses" page for FAQ's