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Directory:Green Steam Engine

Lasted edited by Andrew Munsey, updated on June 15, 2016 at 12:52 am.

  • This page has been imported from the old peswiki website. This message will be removed once updated.

Page first featured March 28, 2006

Image:Green steam engine anim 95x95.gif

A new piston steam engine design by Robert R. Green.

Designed for practical applications is said to be extremely efficient, economical and easy to build. Provides an efficient means of converting reciprocating movement into rotary movement, simplifying the piston engine.

Plans available.


Permission: The following pictures and text is quoted and posted here with permission of Robert R. Green. (March 28, 2006)

Official Websites




(YouTube September 20, 2010)

- - - -

Steam Engine Power RPM Test


(YouTube September 20, 2010)

Four-Cycle Pro2


Shows four- and two-cylinder versions running. (July 01, 2009)


Complete plans for constructing an engine. Includes:

drawings and dimensions of all the parts

Diagrams for assembly

Complete parts list

Help-line for questions and trouble shooting

A person familiar with the operation of a drill press, band saw and threading tools can make this engine. A small metal lathe is optional. Most of the parts are modified, off the shelf, items.


"Many new ideas for products will emerge from the "Flexible Rod Transmission" . Inquiries for manufacturing license agreements are welcome."

Air and Water Pumps - Multiple cylinders with overlapping phases supply a smooth flow of air with reduced load.

Traffic Barrier Strip - Rotary output activated by a pull cable in same axis as output shaft.

POP Displays - Multiple activation of separate parts with individual timing and amplitude.

Bicycle Derailleur - Horizontal movement without rotation by a pull cable.

Water Propulsion Device - Rotary output from reciprocal activation at a distance.

Model Airplane, Boat or Train Engine -


(US patent # 6647813) 2003, Green

Patent Pending # 12231907

Key Features

Quoting from

: 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.

Image:Green steam engine 500.jpg

: 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.


General Steam Engine Advantages

Steam engines provide advantages such as: less pollution, quiet running, high torque at low speeds, no transmission requirements, runs on a choice of fuels, long life with low maintenance.

Green Steam Engine Advantages

Quoting from

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 and elegantly simple.

Criteria Score

On March 29, 2006, Robert Green provided the following self-ranking of this technology according to the Congress:Technology Criteria set forth by the New Energy Congress.

(0 = least 10 = best)

I. Renewable energy source= 10, device scoring = 10 ,

II. Environmental Impact =10

III. Cost (cents / kw-h) =7 (no fossil fuels required, but can be optional)

IV. Credibility of Evidence =8

V. Stability / Reliability =7+

VI. Implementation =10

VII. Safety/Danger to Persons =9

VIII. Politics of science =10

IX. Open-Source conducive =7

X. Stage of Device Development=6

In the News

Image:Green steam engine 95x95.jpg
There was an error working with the wiki: Code[1] > Directory:Patent Resources > How patents prevent rather than promote adoption of new technologies - Michel Bauwens of the P2P Foundation recently excerpted an article that argues patents might not be the clear-cut technology promotion tool they are hyped up to be. Patents are, at times, a block to technological progress, acting to discourage inventors who have found ways to circumvent the dearly held "natural laws" of thermodynamics and of conservation of energy. (Hasslberger Blog Sept. 6, 2010)
Image:Green steam engine anim 95x95.gif

Directory:Green Steam Engine - Advantages of invention by Robert Green (US 6647813) include: the ability to run on very low steam pressure and volume, inexpensive to build, few moving parts with low lubrication requirement, lightweight. Site includes instructions on how to build it.


See Talk:DirectoryGreen Steam Engine


Steam Power - A visual directory of steam energy websites. (


Robert Green

2337 B Avenida Sevilla

Laguna Woods, CA 92637

Email: []

PH. 949 581 2529

See also

Directory:Steam Engines


- Directory