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Old 28 January 2005, 22:37   #1
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Anti cavitation plates

Hey gang,
I was wondering if anybody uses the anti cavitation plates on their outboards?
I've seen a few on outboards and wonder if they are worth the money.

I was thinking about cutting one out of a aluminium sheet 1/4 inch thick with our plasma cutter. I don't like the idea of drilling the Honda's anti cavitation plate to mount it if you folks don't figure they are worth it.

I've seen a nozzle that goes all round the prop on 50 hp. Hondas in US fishing magazines - looks like it would protect the "wheel"

over the waves
hank
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Old 29 January 2005, 02:11   #2
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Hank, opinion seems divided on this topic but generally people seem to find them most useful on smaller RIBs. If you do a couple of searches on 'doel fins/doelfins' and 'hydro foils/hydrofoils' you should find plenty of food for thought. HTH.
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Old 29 January 2005, 04:41   #3
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Nah!

First, the bits on the engine are anti ventilation plates, not anti cavitation. They help prevent air from being entrained into the propeller from the surface. Cavitation is another matter altogether and only occurs on high speed heavily loaded propellers and can soon destroy your prop.

If a boat is properly designed and the engine is correctly installed, there is no need for them.

They can also help get a boat onto plane and/or help prevent porpoising if it needs that. but if a boat is well designed and set up, they will probably just slow it down a bit.

Another point is that the Doel fins put an extra strain on the vent plates which occasionally would result in a fracture of aforementioned plate. (ooh err Missus!)

Have you got problems or are the adverts talking to you, you could experiment by plasma cutting yourself a pait of small trim tabs, although on a 4.5 they would have to be small
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Old 29 January 2005, 07:59   #4
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Quote:
Originally Posted by Rogue Wave
...by plasma cutting yourself a pait of small trim tabs, ....
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Old 29 January 2005, 10:06   #5
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Just what I thought JW! Taking a plasma cutter to my chrome dome isnt my idea of fun and the resulting trim tabs wouldnt be very large.

Havent forgotten about sending you the BSAC Outboard maint notes mentioned months ago, am slowly working through the photos and graphics so that they are all home grown content and no copyright issues.
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Old 29 January 2005, 16:36   #6
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whats a chrome dome? is that what Johnny Fuller is developing!

It looks like the fat fingers have struck again I meant a pair, but I don't think they would do much good on a 4.5
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Old 30 January 2005, 04:17   #7
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Quote:
Originally Posted by Rogue Wave
whats a chrome dome? is that what Johnny Fuller is developing!
Cheeky oul Fkkr!

When are you gonna bring that fork tounge of yours back to Boatmad you grumpy oul Hipocrite?

PS.thanks for you and Jaspers help mooovin Matts pimp-mobile yesterday, much appreciated

Johnny bald dude
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Old 30 January 2005, 04:21   #8
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PPS. motor sounded nice!
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Old 30 January 2005, 08:24   #9
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yeah and the Antifoul tasted foul.


It was a pleasure to watch you reversing
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Old 30 January 2005, 10:01   #10
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Hydro Shield

I'm thinking about getting one of these :~ www.hydro-shield.com

It will be for my Honda 45 (4stroke) which is bolted to my SR4.

Any views anybody?
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