Abstract: A low-pollution external combustion piston engine is adapted to utilize any of a number of expansible gases and fuels, and to maximize power output relative to the weight of the engine. The engine has a highly efficient and compact rotary design featuring a multi-cylinder rotary block acting on a rotary torque conversion plate. The design includes porting and valving for controllably admitting pressurized gas at substantially equal pressures to both sides of each piston to drive each piston bidirectionally and thereby maximize power output and efficiency. Each piston chamber has both primary and secondary exhaust porting to minimize back pressure and thereby further aid power output and efficiency.

Abstract: An exceptionally long, segmented, high-altitude flue of flexible, light-weight material suspended vertically at its upper end from a gas-filled balloon and including at its lower end an open-bottomed hood. The hood segment tapers upwardly from an extremely large bottom opening to its junction with a stack segment. The stack segment is of uniform cross-section throughout and is formed from a plurality of tubular sections permitting the stack to be adjustably raised to any desired height. For field burning purposes, the stack and hood segments are made of a fire-proof material and the bottom hood opening is surrounded by a refractory, rigid-walled enclosure elevated above ground level by skid-type supports. Refire grids of refractory material are provided within the apparatus to minimize the escape of incompletely combusted particulate matter suspended in the hot gases which rise through the hood and stack.

Abstract: An external combustion engine system adapted to utilize any of a number of expansible gases including steam, freon, thiophene, etc. The engine comprises a piston-driven unit which utilizes uniflow principles but is substantially more efficient than the conventional uniflow design because it provides means for conducting the exhaust from a primary side of the piston to a secondary side and thereby extracts additional energy from each gas charge through a second expansion before finally exhausting the gas to vacuum. In addition, the engine has a highly efficient and compact rotary design featuring a multi-cylinder barrel acting on a rotary torque conversion plate for minimizing friction and other energy losses. The design includes special valving for power and direction control and a simplified porting system for providing the aforementioned double gas expansion and permitting cold start-up without the need for bleed valves to drain condensate from the cylinders.