Talk:Pump-jet
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Jets don't clog up, with a properly designed jet unit, they rarely clog. In 10years of jet boating I have never experienced a clog jet unit.
The efficiency of a jet is rarely discussed by any owner of a jet, it is only mentioned by other boat owners, probably because they really don't understand jets.
There are enough commercial boats sizes ranging from 5 metre to 50 metres that use marine jet propulsion, and I'll bet ecomony is the reason they use them.
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A classic use of pump-jets is in modern, heavy-weight torpedoes. This fact was included in the torpedo article for ages - until someone (accidentally?) deleted it. Examples of torpedos which use pump-jet propulsion include the the American Mark_48_torpedo and the British Spearfish_torpedo.
