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In boating, a fender is an air-filled ball or a device in other shape and material used to absorb the kinetic energy of a boat or vessel berthing against a jetty, quay wall or other vessel. [1] Fenders, used on all types of vessels, from cargo ships to cruise ships , ferries and personal yachts , prevent damage to vessels and berthing structures.
Tugboat diesel engines typically produce 500 to 2,500 kW (~ 680 to 3,400 hp), but larger boats (used in deep waters) can have power ratings up to 20,000 kW (~ 27,200 hp) [citation needed]. Tugboats usually have an extreme power : tonnage -ratio; normal cargo and passenger ships have a P:T-ratio (in kW: GRT ) of 0.35 to 1.20, whereas large tugs ...
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