The "Tinny" sound?
Posted: Sun Feb 26, 2012 4:39 pm
Some aluminum boats give off a tinny vibration sound, especially at certain RPM's. Why? What is making this noise?
Plate Aluminum Boat Forum
http://www.aluminumalloyboats.com/
When I'm sitting at anchor with my motor off I can pick up other boats running around me over 1/4 mile away. I don't pick up all boats though.Chaps wrote:Along the lines being discussed here . . .
For the last couple of weeks my boat and I have provided a platform for sea mammal observers in an area around a pile driving project. I noticed that anytime I was just drifting within about 300 yards of the pile driver my hull would pick up the sound of the impact which produced an amplified echo of the activity throughout the boat. It was like standing in the middle of a big speaker. The pile driver would hit the pile and a few milliseconds later the hull would repeat the sound as if someone was in the water hitting the bottom of the boat with a hammer.
Thought it was kind of cool.
This is exactly what passive sonar relies on. The speed of sound in water is something like 4800ft/s at 60 degrees F, so fast enough to consider the information given to be 'real time'.Fisherman wrote: When I'm sitting at anchor with my motor off I can pick up other boats running around me over 1/4 mile away. I don't pick up all boats though.