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Old 23 March 2020, 19:08   #1
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Country: UK - England
Town: Manchester
Boat name: Skipper
Make: Not sure
Length: 4m +
Engine: outboard 2 stroke
Join Date: Sep 2016
Posts: 10
cavity plate height

I have a 14ft speed boat,to enable me to fit the flex steering in it,I
had to raise the transom so the steering rods cleared the splashwell.
I have put a longshaft outboard on it,previously it had a shortshaft.
The cavity plate is now 2" below the hull at the stern.
I know it will cause a bit more drag,but it may help with turning in heavy seas.
I only use the boat for sea fishing,so speed isn't really my problem.
What do the members think,will it be a problem?
The boat is a Broom.
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Old 24 March 2020, 02:44   #2
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Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 2,407
It will work just won't perform great, you may get some spray off the leg but as long as its not trying to fill the boat with water it shouldn't matter.
Couldn't you raise the transom a full 5" so the engine was the correct height?
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Old 24 March 2020, 06:35   #3
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Country: UK - England
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Quote:
Originally Posted by beamishken View Post
It will work just won't perform great, you may get some spray off the leg but as long as its not trying to fill the boat with water it shouldn't matter.
Couldn't you raise the transom a full 5" so the engine was the correct height?
Thanks for your reply B.
I slipped up with the measurements,I only allowed enough room with a bit of clearance for the steering rod cables.
I don't think the spray will be too much of a problem because the boat has a decent splashwell.(two holes for drainage)The freeboard is quite deep,so water getting on the deck I doubt will happen.
I've kept the engine weight down by using a 2000 25hp Johnson.
The boat is well balanced in the water,even when planing.There's not much roll,even at anchor.
'V'
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Old 24 March 2020, 11:40   #4
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Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider 450 Rib
Length: 4m +
Engine: Tohatsu 5/18/30 HP
Join Date: Sep 2007
Posts: 1,925
If the motor sits way deep when on the throttle there will be a rear water splash produced at back transom, besides the shower the combo will slow down dramatically. So its a 25 HP Johnson. Can you post a picture of the lower leg shot sideways ?

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Old 24 March 2020, 14:50   #5
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Country: UK - England
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Quote:
Originally Posted by Locozodiac View Post
If the motor sits way deep when on the throttle there will be a rear water splash produced at back transom, besides the shower the combo will slow down dramatically. So its a 25 HP Johnson. Can you post a picture of the lower leg shot sideways ?

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Yep,it'll be tomoz when it's daylight
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Old 25 March 2020, 13:00   #6
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Country: USA
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I’d bet it’s a waterfall not just a splash. But run it and perhaps you can raise it a touch more if needed
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Old 25 March 2020, 14:58   #7
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Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider 450 Rib
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Posts: 1,925
Quote:
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Id bet its a waterfall not just a splash. But run it and perhaps you can raise it a touch more if needed
Something like this scenario ? If so, raise the motor little by little till the splash is completely cancelled..

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