Anti cavitation plates

hank · 29 January 2005, 02:37

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

Louise · 29 January 2005, 06:11

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.

Rogue Wave · 29 January 2005, 08:41

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

jwalker · 29 January 2005, 11:59

Quote:

Originally Posted by Rogue Wave

...by plasma cutting yourself a pait of small trim tabs, ....

Simon B · 29 January 2005, 14:06

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.

Rogue Wave · 29 January 2005, 20:36

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

Jonny Fuller · 30 January 2005, 08:17

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

Jonny Fuller · 30 January 2005, 08:21

PPS. motor sounded nice!

Rogue Wave · 30 January 2005, 12:24

yeah and the Antifoul tasted foul.

It was a pleasure to watch you reversing

The Bryster · 30 January 2005, 14:01

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?

Daniel TD5 · 30 January 2005, 14:20

hydro sheild looks good let me know how you get on with it

dan

hank · 30 January 2005, 15:06

Thanks for the opinions
I do like the look of that Hydro Shield
back to the drawing board
hank

Rogue Wave · 31 January 2005, 07:18

Quote:

Originally Posted by Jonny Fuller

Cheeky oul Fkkr!

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

Johnny bald dude

As soon as you recognise the difference between a forked toungue and a Barbed tounge!

to get back on track does that Hydro shield fasten to the bottom of the boat. I am afraid the picture wasn't to clear for me

danny · 31 January 2005, 07:38

Hank.

I have made one out of high pollished Stainless steel and it's perfect. Using it now for the third year. Made for a f115 on a 6 mtr rib. Planning at 2300 rpm!! and leaving les waves. Smooth ride.

Quote:

Originally Posted by hank

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

danny · 31 January 2005, 07:47

Hank.

I have made one out of high pollished Stainless steel and it's perfect. Using it now for the third year. Made for a f115 on a 6 mtr rib. Planning at 2300 rpm!! and leaving les waves. Smooth ride.

see the picture.