Published online by Cambridge University Press: 14 September 2016
In the early days of the war the desirability of reducing the weight of areoplane engines to a minimum, consistent with reliability and efficiency, very soon led designers to consider the advisability of using alloys considerably lighter than cast iron or steel for all possible parts of aero engines. Aluminium alloy crank cases had been used for some years in connection with motor car engines, and it was natural, therefore, that such alloys should come into use for the crank cases of aeroplane engines.
Reprinted, the original paper being out of print.—ED.
Page 338 note † Rigidity is here used in a rather loose sense. The periodicity of two elements of a machine of similar form would be inversely proportional to the square root of the modulus of elasticity.
Page 348 note * Owing to printing difficulties, drawings of this engine had to be omitted from the text.
page 373 note * Owing to printing difficulties, it was not found possible to reproduce curves plotted from results given in the Table.
Page 375 note † For analysis see Appendix.