I have get cavitation at about 1100 revs (tickover 850 revs, shallow canal
running 1050 revs to 1300 revs,, deep canal 1050 to 1400 revs river running
1500 to 1800 revs) and also get vibration frm the rudder on shallow canals
at 1050 to 1300 revs and on deeper canals at similar revs. Ususally on
rivers and very deep canals at higher revs the vibration disapears. Having
just been on a slipway for a wek for bottom blacking the rudder has been
checked out by the boatyard and assessed to be OK, there is a little bit of
play in the cup on the skeg but they say that play is necessary and is not
too much or too little.
The distance from rear of prop to start of rudder is 240mm - this to me
appears to be a large gap - I had considered having a plate put onto the
front of the rudder to reduce this distance.
Has anyone got experience in rudder design or can anyone give me details of
any books I can read, or internet links that will help me.
Terry
nb Hakuna Matata
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