On Mon, 14 Aug 2006 11:25:09 +0100, "Bruce Peckett"
<[EMAIL PROTECTED]> wrote:
>The problem *is* cavitation (it doesn't matter what speed it happens at
>or why it is happening, if the prop is running partially in air it's
>cavitation!)
>
>I suspect your rudder vibration is probably caused by the cavitation,
>solve the cavitation and I'll lay odds you'll solve that too. (A
>cavitating prop generates a maelstrom of broken wash which will be
>hitting the rudder)
>
>The solution, since redesigning the hull isn't feasible, is ballast. Get
>the stern deeper in the water.
>
>HTH
>Bru
Sorry guys but everything described upto now is Ventilation not
Cavitation!
Two other places to check for air getting to the prop are-
Via the Weedhatch cover seal
and
at the backof the boat in the centre! ie directly over the prop wash.
Believe it or not ventilation on my boat is reduced by running without
an "anticavitation" plate in the bottom of the weedhatch box.
Richard
Nb "Pound Eater" Parkend G+S
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