Flying Machines: Construction and Operation: A Practical Book Which Shows, in Illustrations, Working Plans and Text, How to Build and Navigate the Modern Airship.

Strange as it may seem, multiplicity of cylinders does not always add proportionate weight. Because a 4-cylinder motor weighs say 100 pounds, it does not necessarily follow that an 8-cylinder equipment will weigh 200 pounds. The reason of this will be plain when it

Tilting Motor on L. A. W. Aeroplane.
Upper cut shows motor tilted when machine is leaving the ground. Lower cut shows motor in horizontal position when machine is flying.

[Description: Black and white illustration: Two-part diagram of aeroplane with tilting motor and propeller.]

is understood that many of the parts essential to a 4-cylinder motor will fill the requirements of an 8-cylinder motor without enlargement or addition.

Neither does multiplying the cylinders always increase the horsepower proportionately. If a 4-cylinder

motor is rated at 25 horsepower it is not safe to take it for granted that double the number of cylinders will give 50 horsepower. Generally speaking, eight cylinders, the bore, stroke and speed being the same, will give double the power that can be obtained from four, but this does not always hold good. Just why this exception should occur is not explainable by any accepted rule.

	CHAPTER IX. SELECTION OF THE MOTOR. Flying Machines: Construction and Operation: A Practical Book Which Shows, in Illustrations, Working Plans and Text, How to Build and Navigate the Modern Airship.

University of Virginia Library

Multiplicity of Cylinders.

Tilting Motor on L. A. W. Aeroplane. Upper cut shows motor tilted when machine is leaving the ground. Lower cut shows motor in horizontal position when machine is flying.

Tilting Motor on L. A. W. Aeroplane.
Upper cut shows motor tilted when machine is leaving the ground. Lower cut shows motor in horizontal position when machine is flying.