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Duke Engineering's new four stroke "axial" engine

(kulpims)
9 years 9 months 2 weeks ago

Engineering

WHAT TYPE OF ENGINE IS THE DUKE ENGINE?

The Duke engine is a four stroke "axial" reciprocating engine. "Axial" because the axis of each cylinder is aligned with the axis of the output/crank shaft. Axial engines are sometimes called 'barrel' and 'Z-crank' engines. The former refers to the cylindrical shape of the Cylinder Group whilst the latter alludes to the shape of the Crankshaft. The Barrel shape is a result of the pistons being spaced evenly around the central Crankshaft and aligned parallel to the Crankshaft axis. The 'Z' in the crank provides the journal surfaces upon which the combustion loads (via conrods and then a swashplate, or the case of the Duke engine a 'Reciprocator') act to provide the driving torque of the engine. The uniqueness of the Duke Engine is the combining of these two motions in a counter-rotating configuration which results in a myriad of mechanical and performance advantages.

WHAT FUEL DOES THE DUKE ENGINE RUN ON?

So far the prototype and developmental engines have run on petrol of various octane levels (91 through 98 octane) and kerosene based Jetfuel without modification and can be readily modified to run on diesel, or indeed any of the alternatives currently proposed as replacements for petroleum-based fuels, such as Bio-Fuels, Hydrogen, LPG, CNG, etc. In fact there are certain features such as the relative coolness of the Combustion Chamber walls during the combustion phase that give the spark ignition Duke Engine advantages for working on low octane fuels, such as kerosene. This feature has some manufacturers very excited as it offers the opportunity for a lightweight, high output engine operating on jetfuel – a fuel typically requiring a heavier, bulkier Diesel engine to be specified.

WHAT ARE THE MAJOR ADVANTAGES OF THE DUKE ENGINE?

The most immediately obvious advantages of the Duke Engine are its size and weight when compared to late model conventional internal combustion engines. Duke purchased two current production 3-litre automobile engines (one European and the other Japanese) for measurement to provide true 'apples with apples' comparisons. The current prototype Duke 3-litre engine is up to 19% lighter than those two engines, despite being far from optimised for minimum weight. For example, the significant weight contributed by the many fasteners in the developmental engines would not be present in a production version. The Duke's size advantage is even more impressive, being as little as one third of the shipping box volume - the crate size that would accommodate the engine - of the 3-litre comparison engines. Similarly, a 'shrink wrap' measurement of the volume of the comparison engines showed the Duke has up to a 36% smaller volume.

http://www.dukeengines.com