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Old 07 May 2005, 16:43   #1
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Country: USA
Town: Los Angeles
Boat name: The Boot
Make: Avon SR4
Length: 4m +
Engine: 2000 Tohatsu 50
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Hydraulic or Electric trim tabs on ribs? Anybody using them?

I am considering the installation of adjustable trim tabs to my Avon SR4. I currently have self adjusting oil filled trim tabs and they definitely have improved the ride and hole shot but I want to be able to control them so I was thinking of installing new ones. Currently heading into seas the tabs help but not as much as I would like. The compromise is in returning seas the tabs are still down which can lead to stuffing etc. Since I cannot adjust the tabs I have to set it to work for both heading and following seas, a compromise for sure. The adjustable trim tabs would allow me to put more downward angle into heading seas and lift them out in following seas. If I'm crossing diagonally in either sea condition I can likewise lift one tab and feather the other down a little to keep me leaning somewhat into the waves.

My question is does anyone here have adjustable trim tabs in your boats? If not, why? If so, can you share your experiences? Do you prefer the electric or hydraulic version?

Boatster
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Old 07 May 2005, 17:58   #2
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Here is a pic of the gas filled strut trim tabs that I currently have installed:
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Old 07 May 2005, 19:53   #3
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Country: USA
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Boat name: Sunrider
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I've used hyraulic adjustable tabs on my RIB with very good results. Mine is bigger (24') and can be very heavy when full loaded, and I've found the tabs to be absolutely necessary. Can't find my camera but when I do I'll add a picture because the ones I use are very large - over two feet wide per side. I tried smaller ones, then Bennet Marine sent these to try and they worked very well although I've never seen such big ones on a similar size boat. I would definately suggest adjustable over fixed, for many reasons.
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Old 07 May 2005, 23:07   #4
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Hi Sunrider,

What do you think about the Lenco electric trim tabs versus the Bennet? Also, how far down do you put your tabs in a heading sea? ( in degrees roughly) How about following seas, do you usually lift them all the way out? Also do they help in short period windswell chop 6-8 second period stuff? Right now my boat pounds hard sometimes in 2-3 foot chop heading into the swell. The stern of my boat is a little heavy but I was wondering if the trim tabs would level the boat off when coming off the top of a wave heading into the next....

I'm almost certainly going to upgrade my trim tabs though. Thanks.

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Old 08 May 2005, 15:02   #5
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I somehow get the feeling that our main UK contingent of ribbers do not use trim tabs?
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Old 08 May 2005, 15:37   #6
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Boat name: April Lass
Make: Moody 31
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Boatster hi,

correct very few ribs over here have them. Do you have power trim and tilt on the Tohatsu ? and is that not effective enough ?

Whilst we are on about 4m Avons, Oli is having problems with his leaning over to Port. Is your engine exactly in the middle of the transom ? could you measure it and find out for us.

http://www.rib.net/forum/showthread....4285#post94285

Thanks

Pete
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Old 08 May 2005, 15:47   #7
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ribster i think the real issue with your hull may be the deadrise and the shape of the hull.. most of the hulls overseas are made for the rough water they operate in.... tabs are certainly great to help bring the hull deaper into the water in head seas but it is still a compromise for a hull that can't handle the conditions your in....
as far as the lenco tabs i've had experience with both them and the bennets. Not on my rib but on my rampage and my friends center console. the bennets are great but are much more complicated system although they have been around for 25+ years. The lencos are a snap to install and maintain plus they are very fast acting that may be an advantage for your rib. If i needed to install a new pair in whatever boat i were to buy next i would use the lenco for the reasons listed above. otherwise they both do the same thing very well
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Old 08 May 2005, 16:58   #8
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Hi Tunawish,

actually I usually run in pretty rough conditions. Crossing from the mainland out 27 miles to the channel islands can get pretty rough ( 3-4' seas @ 4-6 second period + wind chop) The boat actually cuts really well in the rough stuff but its the departure angle from the crest of one wave into the face/crest of the next that causes the pounding. I need to keep my nose down (too much weight in the rear I suppose). In any case I am pretty sure getting the adjustable trim tabs will be the call.

I like the Lenco for their electrical efficiency and simplicity. I will post my result when I get them on and tested.

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Old 08 May 2005, 17:04   #9
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You could always try moving heavy items like passengers etc forward - or carry some bags of sand!!!
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Old 08 May 2005, 17:08   #10
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HI Pete7,

I do have power trim on my outboard but the trim tabs still help smooth out the ride and increase onto plane time by a huge amount. I am seriously surprised that there is no feedback from UK ribbers on trim tabs. I am certain that if you Chaps gave them a try you'd notice the difference like day and night. And I do not work for any of these Yankey trim tab companies either.

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