Where to position trim tabs

[danray35e]

I am purchasing some Nauticus Smart tabs sx for my 69 Mckee Craft. I would like advice on where to put them.
I have attached pic pink being outline of my transoms shape. Blue and green are the places I would mount them. But do I put them in green area or blue area?

 

[Grandad]

Re: Where to position trim tabs

That looks like a fast planing hull to me. You need the tabs to work not only before you plane, but after she's up and essentially out of the water. I think that putting the tabs at the outside position will have them mostly out of the water when on plane. Might make for an interesting wake though. Maybe a wide rooster tail? - Grandad

 

[Maclin]

Re: Where to position trim tabs

I think Green. Better angle, allows more tab bite, just my opinion.

 

[danray35e]

Re: Where to position trim tabs

That looks like a fast planing hull to me. You need the tabs to work not only before you plane, but after she's up and essentially out of the water. I think that putting the tabs at the outside position will have them mostly out of the water when on plane. Might make for an interesting wake though. Maybe a wide rooster tail? - Grandad

Well she is a 14 1969 Mckee Craft tri hull. I resurrected her from years of weeds and fines growing over her. She has a 1976 55hp Johnson Seahorse on her. She does get up and go I was clocked at 40 one time, and that was about 75 % throttle. I can only do that on water that is smooth as glass, but even with smooth water she bangs up and down at high speed. I don't have the ability to effect trim up and down. It is fix it in position and go.
I would really like to get her on plane at a lower speed, and cut down on the porpoising. Everything I have read seems to speak of outstanding results for small boats using the smart tabs.

 

[danray35e]

Re: Where to position trim tabs

Well I am hoping for some other opinions.

 

[joewithaboat]

Re: Where to position trim tabs

I vote the green area but i would check with the manufacturer. When i had questions with mine, i emailed the pictures and called. They looked at the pictures right away and answered my questions on the phone.
Good luck! You will love them.

 

[danray35e]

Re: Where to position trim tabs

how long did you wait to call? I mean did you send the pics and then call them right away, or call them after a couple of days waiting for an answer?

 

[joewithaboat]

Re: Where to position trim tabs

I called 5 min after sending pictures. They looked in the email box and looked at my pictures and talked with me about them. They then sent me some pictures of another persons similar transom and waited for me to open them all while on the phone. They were very willing to make sure i had a successful install. My transom has multiple angels both up and outward. Very good customer service. This was all about 1 year ago.

 

[steelespike]

Re: Where to position trim tabs

I vote green.You need the pressure applied vertically not diagonally.
I would start adjusting conservatively with light pressure increasing a little at a time.You want just enough pressure to stop the porpoising.Too much pressure ; you'll be dragging the tabs and too much boat through the water.

 

[jdlough]

Re: Where to position trim tabs

Count me as another green vote.

 

[danray35e]

Re: Where to position trim tabs

Thanks to all of you for your input. I just got an email reply from Nauticus saying to put them on the green as well.

 

[dockwrecker]

Re: Where to position trim tabs

Green is good! You'll love them!