Dual Chamber Reciprocating Helicopter engine with 2 hp/lb power density

Pochari Technologies has invented a revolutionary new type of piston engine for use in helicopters with hugely improved power density. The engine is a conventional piston engine where a single cylinder serves as two separate combustion chambers. A single piston reciprocates in a two stroke cycle providing compression in the opposing chamber each power stroke in opposite chamber. A single cylinder, with the same stroke length as a conventional engine, can provide the equivalent amount of power as two cylinders. By eliminating one set of connecting rods, crankshaft, piston and cylinder we can reduce engine weight significantly. The engine is fully valveless. As a two cycle cannot provide vacuum, air must be forced in at high pressure. Electrically driven high speed 4:1 high pressure ratio high CFM turbochargers are used. In a two stroke diesel engine the “blower” or turbo helps in removing as much exhaust as possible at the end of each power stroke. The injection system is conventional common rail. The engine block is 351 high temperature Aluminum Alloy. This invention allows for increased volumetric power density, and most importantly, a gravimetric power density increase by a factor of 2. This technology will be most attractive for weight sensitive applications, such as aviation. As the engine is a “free piston”, rather than using a hydraulic piston, a permanent magnet motor linear generator is used to directly power electric motors for the main rotor and tail rotor drive. The lubrication system is proprietary but provides greatly enhanced lubrication over conventional crankcase fed cylinder lubrication as oil is injected directly underneath the oil ring at a constant rate and pressure. The engine will be designed for use in Pochari Technologies general aviation aircraft. Targeted BSFC is below 0.33 lbs/hp/hr. Power density is estimated to be approximately 2 hp/lb. CR is 17:1. No DPF, EGR, SCR is needed as the engine is designed solely for aviation. Since emissions do not dictate the design as in the case for automotive diesel engines, we can design the engine for power density at the expense of emissions. Note the picture and video below are for diesel cycle versions. For those interested, Please contact Christophe Pochari at https://twitter.com/CPochari


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