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Old 20 November 2006, 08:27   #1
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Trim Tab Placement

I want to fit trim tabs to my 4.5m rib to give the stern some extra lift as I have just installed a larger fuel tank under the console, but the shape of my hull is causing me a few problems, the correct size tabs for the boat (fixed ones by Plastimo) (and the narrowest I can find for the size boat) will mean that when fitted they will slightly overhang the step/end of the spray rail in the hull at the transom (which is inverted on my hull!)- will this have any noticeable undesired effect such as drag? or would a small overhang have no effect? (see pic attached)

Has anyone used fixed tabs here? do they work or do they take a while to setup to acheive best results? - I could buy a set of Naticus automatic tabs, but would have to buy an underated hp size trim tab plate to get it to fit (also the ram length would interfere with the manufactures plate on the transom - but I could re-locate this)...
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Old 20 November 2006, 10:10   #2
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http://www.ollysrib.741.com/images2.html

mine work well, nitrogen gas filled smart tabs from nauticus (30/40lb actuators cant remember)
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Old 20 November 2006, 10:15   #3
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hmm, i might wait for the boat show and have a closer look at those - seems you can only find them online

Do they hang down when they are out the water? or stay put?
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Old 20 November 2006, 10:27   #4
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Hi

I had a set on my searider they hang down when you are going slow and lift as the water pressure increases lifting the stern.

you can use a line on them to tie them up if required search "smart tabs" as we put pic in the thread when this came up before

James

http://rib.net/forum/showthread.php?...ght=smart+tabs

The large picture was my setup with the tabs near to the tubes
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Old 20 November 2006, 17:15   #5
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Trim Tab Placement

I have a set of the Automatic Nitrogen gas ram (40lbs) tabs on my Searider 4.7 and they transformed its acceleration and stability especially when 3 up with kit on board. I suspect the fixed type would have been less effective. The placement of the Nauticus (I think?) ones was clearly detailed in the instructions and a small template for was supplied for helping to set the angle of "droop" from the transom. Installation took about an hour taking it steady and reading everything twice. I have also noticed ventilation is greatly reduced in fast turns as the boat rolls less while feeling steadier than before. All In all 130.00 well spent I feel.
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Old 21 November 2006, 05:21   #6
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Hmm, bit late now, i've ordered the Plastimo ones they were only 50 with the manual-adjust rams and look quite good quality, however they may end up on ebay if they are too big - will have to wait and see I guess!

http://www.marinemegastore.com/jump/...-PLA_38916.htm
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Old 21 November 2006, 10:51   #7
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Ah well I guess they are simplicity itself, with now't to go wrong
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