FS 'Fixed System'
For boat owners that wish to quickly set-up their boats running attitude. These manually adjustable trim tabs correct any conditions such as a slight listing or stern heavy drag due to slow planning speeds, heavy fuel loads, gear or passengers. Even boats fitted with heavy 'Four Stroke' O/B engine.

When the boat is at rest in the water the rams are fully extended, positioning the tabs down. The submerged rams are filled completely by the surrounding water, via upper fill ports

Accelerating from rest, the forward motion of the boat acts on the downward pointing tabs, creating the desired lift, raising the stern of the boat. As the boat accelerates onto the plane, the rams gradually collapse through a partial hydraulic lock, the control zone

When the boat achieves plane and no longer requires the high lift, the ram's internal piston crosses into the zone which allows the rams to collapse very quickly. Keeping the boat on the plane maintains the rams in the 'neutral position'. (No effect on the boats trim).

When the boat is taken off the plane and brought to rest, the force under the tabs is lost. Light internal springs automatically return the rams to the start position ready for the next cycle.

The RocketFlap is a simply but ingenious pair of rams/pistons attached to stainless steel tabs.
The fully automatic hands free system uses the surrounding sea, lake or river water as the hydraulic fluid in the patented rams instead of any oil. The power source for the system is the boats own forward motion through the water while accelerating onto the plane. This novel method provides the ever reliable power to activate the system.

RocketFlap is not a conventional trim tab system. It does not provide a means of independent, lateral trim while the boat is underway! The vast majority of these boats don't require this feature. RocketFlap has been designed specifically to get runabout sized boats up and on the plane with as little effort as possible. It's not a high performance maximum speed accessory. It is a true performance enhancing product that is totally practical, simple to install, easy to maintain and use...