NOISELESS MOTORS
EFFICIENCY ESTABLISHED ‘ When the endurance flyers landed it was . found that they had become deafened by the constant noise incident to flying day after day.” This familiar extract from practically every news story of the endurance flights which have been held this year is striking proof of the advancements made by automobile engineers in eliminating noise from their products. The noise in airplanes is chiefly created by the exhaust of the engine and the terrific rush of air caused by the propeller. Mufflers are not usually used on airplane engines as they add to the weight, and slightly retard engine efficiency. The motor-car lias many more potential noise sources. It has the same potential engine noise and the rush of wind while travelling at 60 miles an hour or more. In addition it is operating over a solid road which creates a certain amount of fyre noise. In spite of all this, it is possible to converse without difficulty in the better-made cars while travelling at high speeds hour after hour.
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https://paperspast.natlib.govt.nz/newspapers/SUNAK19291029.2.29.4
Bibliographic details
Sun (Auckland), Volume III, Issue 806, 29 October 1929, Page 6
Word Count
173NOISELESS MOTORS Sun (Auckland), Volume III, Issue 806, 29 October 1929, Page 6
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