Tabman II, Info needed

[SS MAYFLOAT]

Tabman, I overheard at the local marina that a manufacture of trim tabs is experimenting using stepper motors instead of hydraulics. I know these stepper motors are powerful for their size and would be excellent for precise control on trim.<br /><br />These gents were saying how these tabs will automatically keep your boat level without manual adjustment. Do you have in more info on this?<br /><br />Some of my equipment that I service use stepper motors. They seem to be very reliable until a voltage spike or glitch happens. Then it is a pain to get everything recalibrated. <br /><br />I like new technology, but I still prefer the proven reliable ways best.<br /><br />Thanks

 

[Tabman]

Re: Tabman II, Info needed

SSMayfloat,<br /><br />Sounds like they are talking about the German ElTrim system and the Mente-Marine tab control system. I am very familiar with booth systems. <br /><br />You may not it but Auto Tab Control is not new, Bennett Marine has been manufacturing an Auto Tab Control for since 1992 with many thousands sold, it is a great product! It automatically controls the Trim Tabs and is a mature, proven system. It is available at just about any marine retail outlet. <br /><br />Our Auto Tab Control keeps the boat running at its optimum attitude as speed, sea and loading conditions change, with no input from the operator. It is a great way to put “cruise control” on Tabs. If you would like additional information I would be delighted to send it to you. <br /><br />The idea of using stepper motors in a Tab system would address some of the problems that other electromechanical Trim Tab systems face, such as using an electrical brake to prevent the motors from overrunning and may allow a form of feedback to control the system. <br /><br />Hydraulic systems are just as precise and of course can run at variable speeds, and since the motor can be put in a friendlier environment the system will gave a greater life span. The biggest problem with any electromechanical Trim Tab actuator is that when the shaft is extended out of the cylinder body it creates a vacuum inside the unit. This will draw water into the cylinder causing failure. The seals on the shafts are prone to damage from any marine growth (one company will not warranty their actuators if the tabs are left in the down position). In my (admittedly biased) opinion there is no advantage to these systems and several disadvantages. <br /><br />I hope you find this helpful.<br /><br />Tom McGow<br />Bennett Marine

 

[Jdeagro]

Re: Tabman II, Info needed

Not to mention that a potential electrical grounding problem through the electric motor/actuator will invite electrolysis problems.