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Old 30-01-2014, 07:12   #46
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Re: Defever leaning to port...trim tab issue?

Hi Dave

Could you please explain the purpose for fixed trim tabs?
Thanks

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Old 30-01-2014, 07:21   #47
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Re: Defever leaning to port...trim tab issue?

I think the term "trim tab" is misapplied in the context of "fixed trim tab". If they exist in this case they may have been applied to help get the boat up on a plane more easily. We have the same type of thing on our RIB dinghy.
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Old 30-01-2014, 11:47   #48
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Re: Defever leaning to port...trim tab issue?

This fixed tab thing may be a language or definition issue. Some boats are built with or have added fixed wedges or tabs(horizontal fins to control unwanted bow angle up or down. I don't know if that would come under the definition of trim tab, language detail is not my thing. I still think someone should be checking out the rudder situation on this boat that only leans at speed.
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Old 30-01-2014, 12:03   #49
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Quote:
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Hi Dave

Could you please explain the purpose for fixed trim tabs?
Thanks

Capt Nemo
Many boats are often fitted with a trim tab fixed at a particular angle. ( by a threaded rod ) this is to correct an Unacceptable angle at above displacement speeds. Usually this is bow angle but I have seen them used to correct list at speed. Some boats can chine walk and tabs are used to correct that.

These tabs are different from adjustable tabs.

Dave
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Old 07-02-2014, 00:34   #50
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Any news on the tilting problem?
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Old 20-02-2014, 12:40   #51
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Re: Defever leaning to port...trim tab issue?

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CACruiser
Any news on the tilting problem?

Any body?
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Old 20-02-2014, 13:26   #52
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Re: Defever leaning to port...trim tab issue?

Quote:
Originally Posted by eyschulman View Post
This fixed tab thing may be a language or definition issue. Some boats are built with or have added fixed wedges or tabs(horizontal fins to control unwanted bow angle up or down. I don't know if that would come under the definition of trim tab, language detail is not my thing. I still think someone should be checking out the rudder situation on this boat that only leans at speed.
Many power boats lean at speed. I have spent alot of time trying to solve the problem on planing power boats. Everything from outboard motor vertical placement adjustments, removal of hull strakes, addition of hull strakes, angle of hull strakes to center line...etc etc. Even boats with dual engines with counter rotating props would sometimes lean one way or another. After all this my guess is that it is torque related, but also wind related. It appeared that with a boat totally level on plane, when a light direction adjustment was made and even a ripple of a breeze was now from one side, the boat would lean. The solution is just using hydraulic trim tabs to adjust it out. (ie; more trim on one side than the other)
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Old 23-03-2014, 08:36   #53
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Re: Defever leaning to port...trim tab issue?

Many planning hulls especially the deep vee hulls will lean to one side or the other. Main reason for tabs. Mine does it to.

It is mind boggling to me that a person captaining a 68 ft vessel doesn't know more about his boat or specifically trim tabs. Trim tabs are not uncommon. Pretty scary.
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Old 23-03-2014, 08:52   #54
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Re: Defever leaning to port...trim tab issue?

Quote:
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I PMed CaCruiser the other day and he had an electrician and a diver coming to check for trim tabs and/or stabilizers and said when he found out what is the problem he would get back to us on CF...
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I guess all may be revealed when the boat is finally hauled. I hope we get to hear the conclusion.
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Bout time we heard back from the original poster!!

Seems to me he needs to put a mask on or pull the boat.
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CACruiser
Any news on the tilting problem?
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Any body?
I think it blows major donkey when we put in the effort to help, and the OP is off in the wind.... Too bothered to update or thank us...

There goes "our learning moment" when we might be able to help a thankful and enthusiastic newbie with a similar problem in the future...

: o P*************

(that's a shame on you raspberry)
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Old 23-03-2014, 15:30   #55
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Re: Defever leaning to port...trim tab issue?

Patience is a virtue :bangh ead:
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Old 25-03-2014, 17:54   #56
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While waiting for the owner's response, I have developed three new potential fixes.
1. While underway, determine maximum heel and record it in degrees. Hire a shipwright to adjust the decks and the sole to match the amount of heel being experienced. This would require some cabinet and furniture removal and replacement but it would make everything level at cruising speed. or ......
2. Never exceed 3-5 knots underway or ..............
3. Never leave the dock.

PROBLEM SOLVED!! BRING ON THE NEXT ONE.
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Old 26-03-2014, 07:10   #57
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Re: Defever leaning to port...trim tab issue?

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Patience is a virtue :bangh ead:
I got the OP's patience right here.... (oops no appropriate smiley similar to thumbs up)...

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While waiting for the owner's response, I have developed three new potential fixes.
1. While underway, determine maximum heel and record it in degrees. Hire a shipwright to adjust the decks and the sole to match the amount of heel being experienced. This would require some cabinet and furniture removal and replacement but it would make everything level at cruising speed. or ......
2. Never exceed 3-5 knots underway or ..............
3. Never leave the dock.

PROBLEM SOLVED!! BRING ON THE NEXT ONE.
Excellent!!!

#1 would probably require a healthy counterweight suspended from the high side beam when stationary... But certainly doable... I vote for #1...
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Old 26-03-2014, 09:01   #58
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Re: Defever leaning to port...trim tab issue?

Its not as much a laugh as you think, many boats have balancing weights embedded in the boat to compensate for static heel, especially boats built with optionally different interiors.

dave
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Old 26-03-2014, 10:34   #59
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Re: Defever leaning to port...trim tab issue?

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Its not as much a laugh as you think, many boats have balancing weights embedded in the boat to compensate for static heel, especially boats built with optionally different interiors.

dave
I think the term is 'Ballast'
not sure how true, but I was told that some of the south coast work boats had ingots that could be moved to the windward side when beating
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Old 27-03-2014, 11:13   #60
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Re: Defever leaning to port...trim tab issue?

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Its not as much a laugh as you think, many boats have balancing weights embedded in the boat to compensate for static heel, especially boats built with optionally different interiors.

dave
Seen it plenty of times... had a dockmate with a 45' flybridge that listed a serious 4-6 degrees... Never got him talked into fixing it...

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I think the term is 'Ballast'
not sure how true, but I was told that some of the south coast work boats had ingots that could be moved to the windward side when beating
All the time... race boats... cruise boats... dingy with a fat friend for the piping days...
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