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Noise generated on board ships and submarines can have far-reaching effects on the ability of the vessel to operate safely and efficiently. Military vessels in particular need to be quiet to avoid detection by sonar , so many methods have been used to limit a vessel's noise signature.
The Potez-CAMS 141 was designed by Chantiers Aéro-Maritimes de la Seine (or CAMS, which since 1933 had been part of Potez) to meet a 1935 French Navy specification for a long range marine reconnaissance flying boat to replace obsolete aircraft such as the Breguet Bizerte, competing against the Latécoère 611 and Breguet 730.
Torpedo boat (fast attack craft) Displacement: 183.4 tonnes standard, 210 tonnes full load: Length: 42.6 m (139 ft 9 in) Beam: 7.1 m (23 ft 4 in) Draught: 2.3 m (7 ft 7 in) Propulsion: 4 Maybach MD 871 diesel engines, 3000 PS each (replaced by MD 872 engines with 3600 PS in the late 1960s)
Electronic noise control: Electronics, sensors, and computers are also employed to cancel noise by using phase cancellation which matches the sound amplitude with a wave of the opposite polarity. This method employs the use of an active sound generating device, such as a loudspeaker to counteract ambient noise in an area.
The wavelength in air of sinusoidal noise at approximately 800 Hz is double the distance of the average person's left ear to the right ear; [1] such a noise coming directly from the front will be easily reduced by an active system but coming from the side will tend to cancel at one ear while being reinforced at the other, making the noise ...
A simple way of considering wave-making resistance is to look at the hull in relation to bow and stern waves. If the length of a ship is half the length of the waves generated, the resulting wave will be very small due to cancellation, and if the length is the same as the wavelength, the wave will be large due to enhancement.