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Old 05 February 2003, 05:33   #1
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Country: Netherlands
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Boat name: skip
Make: revenger 25
Length: 7m +
Engine: mercury 250 pro xs
Join Date: Oct 2001
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trim tabs

Is there someone who has experience with trim tabs?
I'm thinking of bying them for my rib, but I don't have any knowledge about that subject. Manufacterers(?), size, do they realy work? And what about powerlift, does someone know a good site on the net or something?

thanks
Niels
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Old 05 February 2003, 05:51   #2
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If your boat is under 7 metres forget it they will not do anything.

Alan P
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Old 05 February 2003, 06:35   #3
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Trim Tabs

Hi

As Alan said you need a boat over 8 meters really and one that is quite heavy to get the benefit from them. We use them on our boat and they are great to help with the balance etc.

Julian
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Old 05 February 2003, 08:47   #4
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Trim Tabs

I had made similar inquiry a few months back and I got the same aswer as you got from AP and Julian from the boat and trip tab manufacturers.
That is to get any benefit out of them you need a long heavy boat.
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Old 05 February 2003, 15:09   #5
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Country: UK - Scotland
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Boat name: Seafari - VHF CH 71
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Length: 6m +
Engine: Volvo/Iveco/Suzuki
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Trim Tabs

Have just fitted them to my 7m.

I think the difference is very big, can now control the front lift on the boat, and can even it up with a load on.

Most difference i noticed, and is why i put them on, is going into a head on sea, the 'slamming' is greatly reduced, and so am pleased with the result - Taking into account my 7m is fairly heavy with the volvo in it (prob More than Average) on the stern.

By chance (and have not been in it) a couple here put fixed tabs on their 5.5m with a 50 hp yam 4 stroke on it - they said it made a big difference, again, in a head on sea.

My overall - wish i had fitted them last year.

Pete F
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Old 05 February 2003, 15:16   #6
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I'm a little confused by the replies to Niels question regarding trim tabs. Surely, if my understanding of the purpose of tabs is correct, they can only enhance the charecteristics of his hull.
To say that they won't work on a sub 7 metre boat is incorrect. Why do you think they wouldn't work?

Infact, take a look at www.bennettrimtabs.com , they have sizing guidlines for boats from 15' upwards.

As for powerlifts, I can recommend both Stainless Marine and Bobs Machine shop. Both excellent products, although I prefer the Stainless Marine version.
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Old 05 February 2003, 15:38   #7
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Im in agreement here with Seafriskye and Dirk.

They should help in trimming the boat and maybe keeping the nose down or up when needed.They will pay for themselves in fuel economy over a number of months.

Im also running with Bennet trim tabs they are available at most marine stockists.

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Old 05 February 2003, 15:44   #8
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Hmm

good link to trim tab explanation

http://www.boatshop.com.au/Publish/index.html ( I like the bit about the auto trim tab which is supposed to adjust itself according to the attitude of the boat )

For a smaller boat wouldnt a hydrofoil do the same sort of job ?

The one main adv I can think of with trim tabs is that they would reduce chine walking & give a more stable ride, but ribs with low sponsons dont suffer the same as a glass deep vees as much anyway

Neils

What benefit are you hoping to get from fitting these ?
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Old 05 February 2003, 15:45   #9
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Blimey Crazyhorse, we actually agree on something, have a virtual pint on me my old mate.
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Old 05 February 2003, 15:48   #10
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