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Old 16 February 2015, 08:50   #1
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Country: UK - England
Town: blackpool
Boat name: Fast Forward
Make: Scorpion
Length: 8m +
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SR4 cavitation plate height

Hi all you SR specialists,can you let me know the recommended cavitation plate height in relation to bottom of boat on a 4m Sea Rider,also is any engine offset required for a 50 Yam 2-stroke,cheers.
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Old 16 February 2015, 15:16   #2
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Country: UK - Wales
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Boat name: Mellifera
Make: Avon
Length: 4m +
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RIBase
I have offset mine, from memory it is either 38mm or 55mm I would have to measure it to confirm. Although I have many haven't so I think you will get about a 50/50 split! With it offset I found it a bit less inclined to chine walk as easily

As per height, mine is about 1" above the keel at mid trim. I have moved it about a bit and I found higher was more stable but would cavitate a bit especially in frothy water, lower had more grip but was less stable. When I rig my new one I will go around these again and drill it so that the engine at its lowest setting is level with the cav plate. Not scientific and I am sure others have other settings!
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Old 17 February 2015, 03:50   #3
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Boat name: Fast Forward
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Length: 8m +
Engine: 315 Yanmar
Join Date: Aug 2006
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Cheers Simon
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Old 06 March 2015, 07:49   #4
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Country: Canada
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To be sure, look up the spec from both your boat and engine manufacturer. Mine's between 1/2-3/4 " below the bottom-flush transom centre. Should be easy to find and it's not a service manual your looking for just the set-up owners manual and they are free as a rule.
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