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Old 12 April 2012, 16:28   #1
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Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
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La Frette tab'd

Just thought I'd post a little summary and a few pictures from fitting trim tabs to La Frette. Hopefully it may be of use to others wondering how hard it is to do.

A quick spin on Gotchiguy's 'Into the Red' last year convinced me that I'd benefit from raising the stern slightly when cutting through the chop. (If you read between the lines I'm conceding that the egg whisk is a bit lardy - but don't tell Gotchi ). I'd also read Chris' posts about fitting tabs to Time Bandit which were also positive so took the plunge and bought a set.

Although Bennett hydraulic tabs are the most recognised brand I really didn't want the complexity, nor did I have the space for mounting the pump unit. This narrowed it down to Lenco or Lectrotabs. Not much to choose between them, and although the Lenco's have nice waterproof cabling connectors, I opted for the Lectrotabs because the control switch looked better and ASAP supplies had all the parts in stock.

Fitting was quite simple.
photo 1 shows the marked out locations.
photo 2 shows the antifoul scraped back to the gelcoat so the Sika will stick
photo 3 shows the holes pre-drilled. I countersuk a recess to allow a bit of space for the Sika to provide a good waterproof bead.
photo 4 shows the tabs fitted
photo 5 shows them antifouled and wires routed through the transom into the transom boxes. (Glad I specced underdeck conduits on both sides)
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Old 12 April 2012, 16:31   #2
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Country: UK - Channel Islands
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Boat name: La Frette
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Engine: 200 Suzzy
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Final couple of photos showing finished transom and control switch.

The switch panel is customisable to control the operation of the tabs. You can swap which tabs works on which switch and also their speed. They also self retract once I turn the engine off and do a quick alignment check each time the engine is powered up.
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Old 12 April 2012, 16:47   #3
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Country: Belgium
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Make: ribquest
Length: 6m +
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Hi Erin

do these trim tabs really offer a real differende on a rib (I see these also a lot on Scorpions and they are supposed to have one of the best hulls available?) The Osprey Vipermax is also a very capble hull so I wonder where is your advantage? Do you have increased top speed? lower fuel consumption? or just a better (quicker ride) in choppy conditions when raising the stern and how much quicker is it then?
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Old 12 April 2012, 17:14   #4
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Country: UK - Channel Islands
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Boat name: La Frette
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I haven't launched the boat yet, so can only tell of my experience driving 'Into the Red' last year. I'm not expecting any more speed, I may get lucky and achieve a very slight fuel saving, but my primary reason was to level the hull a bit when the conditions allow to get the bow to cut through the chop and waves better and give a smoother ride. I certainly noticed a difference when driving Into the Red and was amazed at how much effect they had when fully down. They really made the nose dig in and slowed the boat right down.
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Old 12 April 2012, 17:38   #5
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That's a really good looking job Keith, nice one. Bliksem: I think the advantage will be the improved trim. I tried a prop last year that dug the stern in and produced a noticeably bumpier ride.
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Old 13 April 2012, 02:22   #6
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Great pics and a lovely neat job.

La Frette is a tad stern heavy, so in this case the tabs will help to bring the nose down when encountering surface water.

Most RIBs are able to achieve the full range of trim by the outboard alone, so they are not a common sight.

I am prepared to bet a pint that the comfortable cruising speed, in conditions other than calm, will improve.
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Old 13 April 2012, 03:48   #7
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Quote:
Originally Posted by Channel Ribs View Post
I am prepared to bet a pint that the comfortable cruising speed, in conditions other than calm, will improve.
I'm not falling for that one cos I think you're right
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Old 13 April 2012, 04:21   #8
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Quote:
Originally Posted by Erin View Post
I'm not falling for that one cos I think you're right


What was your average speed in a F3?
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Old 13 April 2012, 04:49   #9
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Country: UK - Channel Islands
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Are we talking wind with tide or against? Could be anything between say high 20's and low 30's I 'spose.
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Old 13 April 2012, 06:48   #10
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Don't forget, got a couple of props here to try out as well.

Sent from my portable speaking device using Rib.net
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