Re: smart tab comparison
Rocket flaps are not the same as Smart Tabs in more than one way. Their cylander is spring loaded to push the plate down, however just enough to allow it to suck in water (fill up). Whe the boat accelerates the Trim Tab push against the cylander filled with water and resist compressing. The relief valve slowly allows the water to escape and the tab retract. Clever!
Once retracted they do nothing. Therefore no ride controll like Smart Tabs, and no help with porpoising.
When the boat slows down the cylanders fill with water again.
The real draw back is that the sea water, crustations, etc. can and do enter the cylander and can and do disrupt the valve function.
In short the only function they perform is to assist the boat to plane, and they can not be tuned to the individual boat.
