Hi , I bought a 30' CC Tournament SF this past summer, if you you go to that model on the Commander club site you'll see it, first pic. I'm doing lots of work and one thing on the list is the trim tabs. They were replaced in 2008 with the Bennett V351 system. I believe the trim tabs are original. The actuator extends 2 1/2 inches giving the tabs around a 20 degree angle. My question is  what was this hull designed have originally, is this system adequate. Any help would be appreciated. 

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Michael, welcome aboard.  Not sure of the right answer for your question but my guess is that the designer did not plan on needing tabs so the addition is what was found to be required. jmho

Hi Tim, Thanks for the greeting ,as far as the tabs I believe they were on the boat originally. The actuator is built into the transom, recessed.

Michael Beaulieu said:


Timothy Miller said:

Michael, welcome aboard.  Not sure of the right answer for your question but my guess is that the designer did not plan on needing tabs so the addition is what was found to be required. jmho

Try it out see how it planes with the range of the tabs.  Use the speed shown on a GPS as you trim it out, if you max out and then reduce speed as you increase tabs they are adequate.  Mine max speed about 80% down at 3200 rpm then I need to reduce as rpms increase but I never get below probably 40% at max rpm.  It is interesting if you forget to keep attention as you add speed if you don't trim up, these aren't good submarines!

When spring is here I will give your suggestion a shot. The down side of that is hopefully it won't come out of the water again till fall, if needs a fix ill have to live another season with it as is. I've replaced the pump and have now started to clean up the actuators and lines which were contaminated with seawater. Makes a nice pink color. Ty Mike



Timothy Miller said:

Try it out see how it planes with the range of the tabs.  Use the speed shown on a GPS as you trim it out, if you max out and then reduce speed as you increase tabs they are adequate.  Mine max speed about 80% down at 3500 rpm then I need to reduce as rpms increase but I never get below probably 40% at max rpm.  It is interesting if you forget to keep attention as you add speed if you don't trim up, these aren't good submarines!

Sound like you have factory installed tabs if you have the recessed pockets. 

 

Although my boat origianal 1976 sales receipt shows the trim tab option was purchased;my boat did not have trip tabs untill I purchased the boat and had them added in 1993.  Made a real difference in boat speed and fuel effenciency based off my test runs made at various RPM and trim tabs settings.

Thanks James, my sale receipt mention Bennett which is the brand of trim tab on there.the actuator extends 2 1/2 inches. I'm not sure I'm getting enough extension on the tabs. Bennett told me they should be 20 to 25 degrees when fully down. These are under 20.I wonder what the originals looked like. Mike

James L. Gordon said:

Sound like you have factory installed tabs if you have the recessed pockets. 

 

Although my boat origianal 1976 sales receipt shows the trim tab option was purchased;my boat did not have trip tabs untill I purchased the boat and had them added in 1993.  Made a real difference in boat speed and fuel effenciency based off my test runs made at various RPM and trim tabs settings.

I know this is super old, but my understanding is if they were ordered with the lower helm, they came from factory with build in recessed trim tabs. Very few were built like this.  

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