What are these called?

[ericcarr2000]

Re: What are these called?

Ive already added a hydrofoil to her..

Sounds more like a steering problem than anything else. Check your steering rams they're probably worn out unless the boat is new. Trim tabs will do nothing to help with your problem, it will help getting on plain faster which inturn may give you the feeling that it's not veering as bad but theres cheaper and more cost effective ways to accomplish this like adding a hydrofloil. This will do the same thing as the tabs for about $50.00 instead of $400.00.

 

[ericcarr2000]

Re: What are these called?

And I disagree with you in you saying that a hydrofoil does the same thing as tabs. trim tabs act as a aileron on a plane, it raises the front, and can raise or lower from side to side, which ever you might have. With these fully extended, they would bring down the bow of the boat, or the front of the plane...Im asking if these would possbly correct my listing problem..

Ive already added a hydrofoil to her..

 

[Fed]

Re: What are these called?

Do you have a steering problem or a listing problem?

 

[jayhanig]

Re: What are these called?

The item in the photo is indeed a Trim Tab. Specifically it looks like an 18" x 9" Bennett Trim Tab. To me it doesn't look mangled, it is in the fully down position meaning that it is holding pressure.

Bennet makes v-shaped trim tabs? It looks like he backed into something in the driveway to me.

 

[DuckHunterJon]

Re: What are these called?

Bennet makes v-shaped trim tabs? It looks like he backed into something in the driveway to me.

I'd agree - it looks crumpled to me. Either way, back to the OP, I think there are two trains of though here and you need to tell us which track you are persuing - a listing problem (boat leans to port or starboard under accelleration), or a steerage problem (would be yaw in aero speak) where the boat steers to a different compass heading on acceleration. If you could please clarify, I'm sure suggestions will be forthcoming.

 

[Tabman]

Re: What are these called?

Bennet makes v-shaped trim tabs? It looks like he backed into something in the driveway to me.

I must be missing something, I am getting older so maybe it's my eyesight! But here is the OPs photo next to a picture of a brand new 18 x 9 Trim Tab:

 

[Fireman431]

Re: What are these called?

The OP's pic didn't look out of sorts to me either. I was wondering what everyone was talking about!!

The OP comment was that he was having issues during acceleration. That's why I recommended hydraulic steering instead of tabs. The hydraulic steering install will correct your acceleration wandering problems and the tabs will level the boat out during planing. They also help you get on plane more quickly. I had the boat leveler tabs and was very satisifed with them.

 

[rbh]

Re: What are these called?

Ive already added a hydrofoil to her..

I did not see anywere were anyone said/asked if you had tried it without the hydofoil on????
One thing that I have learned here is those hydrofoils add alot of instability while you are tring to get on plain.
Your motor/leg is asking your boat to do one thing and the hydrofoils asking it to do another, kind of like standing with your heal on a ball and trying to keep your balance, not easy.

So if I was in your shoes I would first clean the hull (just cause) remove the hydrofoil, install the tabs (which ever ones you want) tabs unlike the hydofoil apply an equal upwards thrust to the stern on both the port and starboard sides do to water preasure.

My 2c anyways.

 

[oops!]

Re: What are these called?

mannnn.....we are way off the rails on this one......

get the tabs if your boat is having a hard time getting on plane......but they will not help one little bit with steering.......they can "fake it" so you wont feel it as much....but you will still have the original problem.

three main reasons for curvature under acelleration....

1. improperly set/incorrect thrust anode. (this is a small 3 inch round thingy behind your prop......it is there to counter the thrust of the prop...if you have adjusted yours, and it still dont work....get one with a bigger fin, and set it up correctly. (these can also be set so if the operator gets thrown overboard...the boat will circle in stead of leaving him...hence...turning under acceleration)

2. improper weight distrubition in the boat. try moving the ice chest and the anchor to the other side...plus a few other goodies. it could also be caused by water logged foam in the boat.......to find out if it is......weigh the boat against the manufacturers specs.

3. hull hook.......a hull hook can make a boat do some pretty scary things.....the hook is usually caused by a bad trailer set up......yes a string line will tell you. take the measurement from the center, the strakes....and the outer chines.

if you add the tabs.....you will be adding a good $400 option that your boat probably does not need.

 

[ericcarr2000]

Re: What are these called?

I actually have both issues. Upon acceleration, the boat lists to the port side and if you let go of the helm, the thing wants to go port also. So as you can see, I have both issues going on here.

Do you have a steering problem or a listing problem?

 

[ericcarr2000]

Re: What are these called?

Ok. Remember, the picture taken was NOT off of my boat...

I must be missing something, I am getting older so maybe it's my eyesight! But here is the OPs photo next to a picture of a brand new 18 x 9 Trim Tab:

 

[ericcarr2000]

Re: What are these called?

Yes I did try it with the foil off. She was doing this when I first got her a few years ago, so I figured that if I bought the hydrofoil, that might correct her. NOT...The hull is clean, still does it..So I guess Ill have to get a set of them tabs and try that out first..

I did not see anywere were anyone said/asked if you had tried it without the hydofoil on????
One thing that I have learned here is those hydrofoils add alot of instability while you are tring to get on plain.
Your motor/leg is asking your boat to do one thing and the hydrofoils asking it to do another, kind of like standing with your heal on a ball and trying to keep your balance, not easy.

So if I was in your shoes I would first clean the hull (just cause) remove the hydrofoil, install the tabs (which ever ones you want) tabs unlike the hydofoil apply an equal upwards thrust to the stern on both the port and starboard sides do to water preasure.

My 2c anyways.

 

[ericcarr2000]

Re: What are these called?

I actually have both problems going on here. The boat lists to the port side, which is corrected with weight distribution. I really dont want to have to ask the passengers to keep on moving back and forth though, lol..As for the steering problem...Upon acceleration, when you let go of the helm, the thing wants to take a sharp port side turn. It feels as if I have to fight her to keep her going straight..

I'd agree - it looks crumpled to me. Either way, back to the OP, I think there are two trains of though here and you need to tell us which track you are persuing - a listing problem (boat leans to port or starboard under accelleration), or a steerage problem (would be yaw in aero speak) where the boat steers to a different compass heading on acceleration. If you could please clarify, I'm sure suggestions will be forthcoming.

 

[Fed]

Re: What are these called?

Try it with the drive trimmed in further.
Don't ignore the previous advice about the little steering/fin/rudder thingie behind the prop.

 

[ericcarr2000]

Re: What are these called?

I have tried it with the outdrive trimmed all the way out, and all the way in. Also. I have tried adjusting that little fin above the prop. Neither one of them seem to work

Try it with the drive trimmed in further.
Don't ignore the previous advice about the little steering/fin/rudder thingie behind the prop.

 

[Bondo]

Re: What are these called?

I must be missing something, I am getting older so maybe it's my eyesight! But here is the OPs photo next to a picture of a brand new 18 x 9 Trim Tab:

Ayuh,... Hi Tom,... You guys have changed yer design,...
Mine, 'n those I've dealt with are pretty Flat, all the way back, 'n the ram is retained by a bracket, rather than the big bend in the plate itself...
It looks like they're easier to build, but gives up about 1/3 of they're ability to do what they're there for...

1. improperly set/incorrect thrust anode. (this is a small 3 inch round thingy behind your prop......it is there to counter the thrust of the prop...if you have adjusted yours, and it still dont work....get one with a bigger fin, and set it up correctly. (these can also be set so if the operator gets thrown overboard...the boat will circle in stead of leaving him...hence...turning under acceleration)

Eric, That's the torque tab I'm talkin' about...
If you tried different positions with your's,...
Try a Bigger 1... They make several choices...

3. hull hook.......a hull hook can make a boat do some pretty scary things.....the hook is usually caused by a bad trailer set up......yes a string line will tell you. take the measurement from the center, the strakes....and the outer chines.

That's also what I refered too,.. The last 4 to 6 feet of the hull Has to be True, 'n Straight...
Use a Straight Edge, not a stringline...

And, your comment about the skeg, "I dont think the skeg is bent at all."
Thinkin' 'n lookin' aren't the same...

Something is seriously Outa Wack,...

Is the list you mention, only under power, or at rest,..??

Asking passengers to move for ya is pretty common on boats up to 25' or so...

 

[Tabman]

Re: What are these called?

Hi Bond-o,

Actually we have been making that type of Trim Tab since Bennett was founded.

We make two basic "standard" Trim Tabs, ones with 9" chord (fore to aft measurement) and ones with 12" chord. Depending on the space available the 9" chord ones are more efficient, but they take up more side to side space. If there is not enough space to fit a long span (side to side measurement) 9" chord Trim Tab, then a shorter span 12" chord can be used.

On the 9" chord Trim Tabs the actuator (ram) is attached where the trailing edge is folded up 90 degrees:

On the 12" chord the actuator is attached to a riveted angle (you must have 12" chord Trim Tabs):

Since the riveted angle is the same distance out from the transom as the folded trailing edge on the 9" chord Trim Tab a 12" chord can be installed on a boat that had 9" ones, without having to move the actuator.

We also make a lot of other shapes and sizes, some custom ones for boat builders or like these M120s for installation where transom space is limited:

 

[Bondo]

Re: What are these called?

Ayuh,... Gotcha Tom,... Thanks,.. Mine are 12"....

Never really noticed the 9"ers being that way...

It makes perfect sense, in that the rams are the same...

 

[Fed]

Re: What are these called?

Most beginners adjust the little fin in the wrong direction eric, just be sure you've got your head around it. You should also check to see if you have a trim limiting pin which may restrict the inward travel.

 

[ericcarr2000]

Re: What are these called?

Bond-o, The list only takes place underway actually. Do you think these tabs will at the very least help me out?

Ayuh,... Hi Tom,... You guys have changed yer design,...
Mine, 'n those I've dealt with are pretty Flat, all the way back, 'n the ram is retained by a bracket, rather than the big bend in the plate itself...
It looks like they're easier to build, but gives up about 1/3 of they're ability to do what they're there for...

Eric, That's the torque tab I'm talkin' about...
If you tried different positions with your's,...
Try a Bigger 1... They make several choices...

That's also what I refered too,.. The last 4 to 6 feet of the hull Has to be True, 'n Straight...
Use a Straight Edge, not a stringline...

And, your comment about the skeg, "I dont think the skeg is bent at all."
Thinkin' 'n lookin' aren't the same...

Something is seriously Outa Wack,...

Is the list you mention, only under power, or at rest,..??

Asking passengers to move for ya is pretty common on boats up to 25' or so...