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Old 12 August 2010, 11:55   #1
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dilemma over trim tabs

hi all ..hoping someone may have some advice or experience on trim tabs

i have a 6.8m ribcraft with a central midships console and 4 individual jockey seats with double a frame and a suzuki df 250 as a lump on the back.

as you can imagine she is stern heavy and in rough seas will drop back into troughs lifting the bow and on occasions causing quite an uncomfortable ride.

i am wondering if fitting tabs would stop the sterns tendancy to fall down keeping the boat flatter and also to reduce the amount of wash she generates at slower semi plane/displacement speeds...?

tab sites suggest having due to the tightness of the transom narrow tabs that are quite deep ...almost square....

also is it worth having adjustable trim tabs or plumping for the fixed "dampened" ones..??

thanks for any thoughts

pete
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Old 12 August 2010, 14:05   #2
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Pete, get adjustable tabs they will enhance your boat. Do a search, it's well documented on Ribnet. One comment, my own opinion, they need to protrude from the rear of the boat a fair distance... So long and narrow backwards not the more common narrow along the length of the hull V.
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Old 12 August 2010, 14:44   #3
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Hi, get adjustable ones, but they are more. I have a set of 'damped tabs' called smart tabs. They do work but they are pretty average.

Pays your money etc etc................
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Old 14 August 2010, 06:12   #4
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will trim tabs improve performance? As in giving the hull the attributes of a longer one.

Nick.
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Old 14 August 2010, 06:15   #5
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Yes, they will.
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Old 14 August 2010, 08:28   #6
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And are they prone to damage if you do a lot of stern first landings?
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Old 14 August 2010, 08:47   #7
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Tabs

I just went through the whole tab fitting experience and you can find more here....

http://rib.net/forum/showthread.php?...ight=trim+tabs

An excellent addition to my boat IMHO, however I did not fit the tabs to correct any particular issues with the boat it already ran extremely well and had none of the issues that you are experiencing due to weight distribution.

I am sure the tabs will help you improve the comfort when heading into the rough stuff however I would also be looking at what can be done to improve the handling of the boat without the tabs. Perhaps more weight in the bow? are all your seats and console bonded in or could they be moved forward without a complete rebuild?

a 250 on the back of a 6.8 sounds like a lot of power and it sounds like you will not be able to use it anyway in anything but flat calm, would it be worth looking to trade the engine in for a more lightweight unit?

Do you have any pics of the boat?
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Old 14 August 2010, 12:26   #8
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a 250 on the back of a 6.8 sounds like a lot....
Thinking about it, this rig sounds like an exercise in arse burying.

In my limited experience of Ribcraft boats (Roycruse' 585), some of the hulls can be a tad bow light. To add to that, you've got all the gear a midships or aft of and you've got a heavy 4st 250 on only 6.8m of hull length.

A pic would be interesting.
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Old 14 August 2010, 15:04   #9
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i will try and get a picture on here if i can work it out...
bear with me..
yes it is a lump on the back but at rest the tubes dont actually touch the water unlike some ribs.
she was originally a inshore safety boat for ocean rowers.
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Old 14 August 2010, 15:36   #10
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i will try and get a picture on here if i can work it out...
bear with me..
yes it is a lump on the back but at rest the tubes dont actually touch the water unlike some ribs.
she was originally a inshore safety boat for ocean rowers.
I hope they didnt need a tow home
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Old 14 August 2010, 15:38   #11
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i hope they didnt need a tow home
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Old 14 August 2010, 15:45   #12
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...
[/URL][/IMG]
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Old 14 August 2010, 16:19   #13
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RIBase
Bow tank
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Old 14 August 2010, 16:21   #14
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Bow tank
A pretty tricky thing to retro-fit.
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Old 14 August 2010, 16:24   #15
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Wtf fella ? looked ok when I saw it ?

Maybe I'm just too easy going
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Old 14 August 2010, 16:41   #16
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Wtf fella ? looked ok when I saw it ?

Maybe I'm just too easy going
I still think that the extended edit time is a mistake.

It's like having an argument with your wife. Doesn't matter what she said. It's what she said she said that counts.

Still, look at the fun we had yesterday with it

Bilged in record time
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Old 14 August 2010, 16:45   #17
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Wtf fella ? looked ok when I saw it ?

Maybe I'm just too easy going
I got scared, RC bashing, fatwas etc.
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Old 14 August 2010, 16:50   #18
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I got scared, RC bashing, fatwas ets.
It's OK, she's over on the Cardiac Surgery forum, empathising...

puk puk puk! pukaaaaah, puk puk puk!
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Old 14 August 2010, 16:52   #19
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Old 14 August 2010, 16:55   #20
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I got scared, RC bashing, fatwas etc.
YIK

Its a tough job though damned if you do and all that
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