Method of reducing the overflying noise of airplanes having a pr

Details Method of reducing the overflying noise of airplanes having a pr Method of reducing the overflying noise of airplanes having a pr

1988-10-18

1990-06-19

Fuller, B. R.

Acoustics

Sound-modifying means

Methods

181206, 381 71, 244 1N, F01N 106

Patent

active

049344838

ABSTRACT:
Method of reducing the overflying noise of airplanes having a propeller den by a piston engine. The propeller is arranged on the engine shaft in such a way that positive components of the engine sound pressure fall on negative components of the propeller sound pressure. It is preferable to use an engine/propeller combination in which the number of engine ignitions per revolution of the propeller shaft divided by the number of the propeller blades is an integer, preferably being equal to 1.

REFERENCES:
patent: 1585218 (1926-05-01), Watanabe
patent: 3685610 (1972-08-01), Bschorr
patent: 4607528 (1986-08-01), Kallergis
patent: 4715559 (1987-12-01), Fuller

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