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Cyclone Power Technologies Successfully Completes Engine Tests for Raytheon Company; > 30% Thermal Efficiency

Cyclone Power Technologies Inc. successfully completed performance tests of its external combustion engine for Raytheon Integrated Defense Systems (IDS). The tests demonstrated that Cyclone’s prototype water-cooled Mark II engine achieved thermal efficiencies of more than 30%, results that exceeded original engineering calculations.

Operating at temperatures of 1,000 °F (538 °C) and steam pressures of 1,150 psi (8 MPa), the compact 98 lbs Mark II ran at 2,133 rpm and produced 13.4 hp (10 kW) and 33 lb-ft (45 N·m) of torque at a diesel fuel burn rate of 0.8 gal/hr.

Raytheon IDS and Cyclone are currently in discussions regarding the next phases of this project, the details of which have not been finalized at this time.

The demonstration of these new technologies was in fulfillment of an Independent Research and Development (IR&D) contract from Raytheon IDS signed last year. In February, Cyclone announced the completion of the first stage of testing, which involved running the Cyclone Engine by the combustion of an environmentally friendly monopropellant called Moden Fuel. When burned, Moden Fuel produces pure water and carbon dioxide.

A team of engineers and technicians from Cyclone, Raytheon IDS, James R. Moden Inc. and Advent Power Systems pioneered, performed and monitored the tests.

Raytheon IDS is a business of Raytheon Company. Moden Fuel, a monopropellant able to burn in the complete absence of air, was originally developed by James R. Moden, Inc. of Richmond, RI, to power US Navy torpedoes. Advent Power Systems, based in Coconut Creek, FL, is the exclusive licensee for US military applications of the Cyclone Engine technology.



If I recall, the Cyclone plus is running on biomass, so what's impressive about diesel yeilding 13 hp/hr/.8gal?


30% efficiency is quite impressive for a small steam engine. But yes the main interest is to be able non liquid biomass cleanely. When a diesel is a pig unless you mate it with a exhaust treatment that cost more then the engine itself.

I think their engine could find applications in big long haul trucks (the effciency of their engine would be higher on a bigger engine because thermal losses would be less) it could also replace diesel on ship, that are so polluting today especially emitting a lot of soots.


Biomass with combined heat and power sounds promising.
But may need just as much scrubbing.
On a pyrolisis plant if the required temperature can be reached?

George V

Something interesting about this engine is that, according to Cyclone, it does NOT require lubricating oil for the pistons, i.e. it is water-lubricated.

Henry Gibson

Burn Lithium in Sulphurhexafluoride, and you would release no gases, and get more energy. The energy density exceeds any lithium ion battery including the heat convesion losses which should be done with a free piston Sterling engine from Infinia anyway. Thermite mixes are also good at giving off no gasses at high temperature and can be made from soft drink cans and iron rust.

A tiny hermetically sealed steam turbine generator with multiple De Laval nozzels is well within engineering capabilities of the 1970s, and it can use water or steam lubricated bearings if the Captone turbine can use air lubricated bearings. ..HG..

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