Abstract
In this paper the author first points out that the heavy-oil engine will probably provide a satisfactory practical power unit for airships long before it reaches the airplane stage. He then briefly describes early experimental work with a single-cylinder research unit to explore the possibilities of compression-ignition operation. Following this he discusses alternative designs which offer possible solutions of the main problem, and then gives results obtained in single-cylinder experiments showing the effect of maximum cylinder pressure upon brake m.e.p. and fuel consumption. Fuel-valve and nozzle design are then taken up, followed by sections dealing briefly with air swirl, valve mechanism, possibilities of the two-stroke cycle, and performance at altitude.
