Trim Tab Upgrade ?

[tara11]

I know this has been discussed in depth, but none on my type of set up I do not think, I have the 2520XL, with a Armstrong bracket with twin motors, now I have tabs that are recessed under the boat and stick out about 2 3/4 inches past the back of the boat, my tabs are 14 inches wide by 10 inches deep, I want bigger tabs, but do not know how much bigger I can put on , probably i can remove the ones I have, fill in the recess gap with something like starboard, mount the new ones right off the back of the transom, but how wide can I go, as I do not want the motors and the tabs to fight each other, does this make any sense ? I have Lenco, so probably I would just by the new ones from lenco and keep the thing that makes them go in and out, as I have the deluxe set up with auto retract and the pretty colored control at the helm, any advise from anyone !
Craig

 

[Bryan 2530]

I have been thinking the same, problem is with twins you can't go much bigger than what is already there. I do not have recessed tabs but I imagine our setups are similar enough. With my 2530 if I use too much tab at low RPM, like just on plane in rough seas, the props will grab air over each wave.

I have come to the conclusion that I need 4 blade, stern lifting props, permatrims or something like it (prefer not to but...) or both. I am going to go for the props first in the fall and see how she runs, then make a decision on the fin.

 

[Megabyte]

On our boats, extra span generally trumps depth (known as chord), but in your case... extra chord might be a solution.

Since you have that tab pocket, you could take a page from the go-fast playbook and increase the chord length.
A lot of go-fasts have limited room for tabs because of multiple drives on a narrow beam. Those guys use a tab with a small amount of span, but a lot of chord.

http://www.bennetttrimtabs.com/trimtabkits.php

It's not optimal, but it is an option.

Or... have the pocket filled by a glass guy and mount the biggest span that you can comfortably fit.

Hope this helps.

Edit: Come to think about it... you could replace those bottom mount tabs with a set that are transom mounted and avoid the limitations of the tab pocket all together.

Another option.

 

[tara11]

I will call Lenco this morning and see what they say/suggest and also call Parker and chat with and engineer, everytime I call Parker and I have a few times, they are VERY helpful and have no problem sharing info ! I will let you know what I find out !







Brian,
I have a pair of counter rotating 4 blade props pretty new in perfect condition, I bought from Tocoma Propellers, I will sell you very cheap, they in in box in my garage, email me and I will send you pics and we can chat more about the props

[email protected]

 

[Bryan 2530]

Brian,
I have a pair of counter rotating 4 blade props pretty new in perfect condition, I bought from Tocoma Propellers, I will sell you very cheap, they in in box in my garage, email me and I will send you pics and we can chat more about the props

[email protected]

Will they fit on F200 gear case?? If I remember right, you have twin F150's.
How come you are not running them?

 

[tara11]

I called Lenco today and we chatted for awhile, basically if I want to get bigger tabs, because mine are ( and your I think) we would have to start all over and move everything around, I do not have a problem with that, but I will wait until mine break or no longer work, also he seemed skeptical on how big I could go, so what he told me is a boat builder builds a boat ( Parker) and then they make the tab to fit where the boat builder has designated for the tabs to go , and the reason my tabs have the ends bent down like a skeg so to speak, is so the tabs do not bend, it is only for strength and has nothing to do with performance, so I am not a good typer, so hopefully this makes since, I do not want to drilll, patch etc,etc, especially now that fishing season is here and beginning to get really good !






Brian I am not sure if they would fit, you might have to order the different hub adapters, but if I take pics of both boxes with the numbers, then you call Tacoma Props , they will tell you if you need to get different adapters and if they would do what you want altogether, they are very helpful !


On my old boat 4 blade props made a world of difference, so some reason on my Parker, it just feels better with the 3 blade SS Yamaha props, I have no idea why, but I have them if you or any anybody you know wants them, I paid $600.00 about for the set, I will give away for a really goood deal, but whoever buys would have to cover the shipping also.

 

[Bryan 2530]

Post up the pics and I'll do the research.

 

[capsized]

Dont know if this helps but... I recently put a pair of bennetts 24X9's on my 23SE. I installed them flush with the top of the recessed pocket area. They work great!

 

[tara11]

Here they are !

http://classicparker.com/phpBB2/viewtopic.php?t=5817

 

[pmeggers]

Hey Capsized,

What tabs did you have on before you upgraded on your 23SE?

Pete

 

[tara11]

Hey Capsized,
Hi, do you have twin motors or a single outboard ?
Craig

 

[capsized]

The boat didnt have any when I bought it but after one trip I realized it needed them. single 225

 

[Porkchunker]

Because of the twin F-115s, I couldn't go with a wider tab without disturbing the water around the anti-ventilation plate.

So...I added a pair of Cobra plates to the anti-ventilation plate. Before adding the plates, my OEM 12"x12" plates were too small to overcome the weight of the twins. She was a$$ heavy and the OEM tabs wouldn't push the bow down. I can now really bury the sharp entry of the bow into the waves.

Sometimes, larger tabs won't work and you have to find an alternative.

Dave

aka

 

[got_em_on]

Porkchunker-Can you tell me alittle more about the cobra plates? Did they make a big difference for you? I have a 2520XL with Twin 150's and don't feel like I am getting best performance out of trim tabs.

Thanks

 

[Porkchunker]

Sorry it has taken so long to get back to you on this.

I have a thread somewhere around here that has a subject of "show us your doelfins" or something like that. Lots of discussion, and I think I added pics. I'll try to find it.

Bottom line is that with the twins, you can't go much wider with the tabs. The tabs disturb the water and if that disturbed water gets too close to the anti-ventilation plates, your props will ventilate. I couldn't get the bow down with the OEM tabs and the 800+ lbs of motor on a bracket, so I had to improvise.

I went with the Cobra plates (similar to Permatrims, but less expensive). That did the trick. It adds lift to the motors, which moves the center of balance forward, which allows the tabs to be effective. Without the plates, the tabs just plowed water and increased my GPH burn rate.

Dave

aka

 

[Porkchunker]

Here is the thread with pics.

Dave

aka