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Old 18 January 2002, 10:24   #11
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That must be quite a speedy set up!

It sounds like the engine is mounted quite high -- are you happy with the results?

John
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Old 18 January 2002, 12:24   #12
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John

Thanks for the observation - I hadn't realised that this was a particularly high mounting.

The rigging of the Optimax in this manner seems to keep the Tornado very stable at speed, although my experience of other boat/engine combinations is limited. In calm water she can achieve 50kt. (but only for short bursts - because my nerve gives out and the fuel consumption rate is horrendous!)

Pat.
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Old 18 January 2002, 13:40   #13
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The general rule of thumb for general use is for the cavitation plate to be in line with the bottom of the transom.

In high performance boats it is often raised to decrease drag, but this can cause problems with prop ventilation when pulling away or in hard turns -- hence my enquiry!

John
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Old 19 January 2002, 08:49   #14
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thanks

this helps!!
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Old 19 January 2002, 11:54   #15
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Oops ...... it would help if I had measured the height correctly. I measured to the forward (and higher plate). The dimension from the main cavitation plate to the bottom of the transom is more like 10mm. My abject apologies for this mistake which would have gone unnoticed had it not been for John's sharp eyes.

The lateral offset is as before - I double checked it!

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Old 19 January 2002, 17:30   #16
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That sounds more like it!

John
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