This engine is a long stroke engine , which results in a higher compression ratio and a longer indicator diagram. Since the RPM of the engine is low the time interval for fuel injection and the combustion process is lengthened resulting in optimisation of combustion which results in optimisation of power without wastage resulting in higher efficiency of the engine. In addition the propeller dia is large resulting in improvement of thrust efficiency at low RPM , so that the power produced is properly utilised.
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