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Discovery of Sound in the Sea
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Photo of a zodiac with outboard engine.
Photo Copyright Tom Kieckhefer
Click either choice below to hear the 35HP Outboard Motor:
QuickTime (63K)
Click this button use any media player
This recording is a small Zodiac with a 35 HP engine. One can hear the engine starting, going into gear and then the thundering cavitation noise as the propeller begins to spin.
Sound courtesy of Tom Kieckhefer. Released under Creative Commons License, non-commercial attribution.
Click either choice below to hear the 50 HP Outboard Motor:
QuickTime (64K)
Click this button use any media player
This recording is of a 50 HP outboard engine starting up and going into gear. You will hear a "ratchet" like sound that is associated with the gears starting to engage.
Sound courtesy of Tom Kieckhefer. Released under Creative Commons License, non-commercial attribution.
Description
Outboard motors are found on small boats that are popular in coastal waters. The propeller of an outboard motor is what creates sound. On smaller boats, like a zodiac, the small propeller produces a cavitation noise which is at higher frequencies than larger vessels. The smaller propellers also produce higher rotation rates which also causes the propeller to make higher frequency noises. A zodiac, for example, can produce frequencies as high as 6300 Hz.