Hydraulic sail trimming cylinder
HYDROTRIM Harken

The Harken HydroTrim is true push-button sailing for main and headsail sheeting. Using a 1:4 or 1:6 reverse purchase, it solves the problem of winches that tail line into the cockpit—the hidden belowdecks or in-boom purchase contains all line within the system and saves valuable space on deck.
The cylinder is affixed to the hull or frame with a two-piece retaining bracket. This one-time installation allows the cylinder to be easily removed and serviced without unbolting anything from the hull. The blocks can be removed from the cylinder ends with a single pin so you can service them offsite or leave the rigging intact while servicing the cylinder. Two smaller low-friction sheaves on the cylinder ends replace the larger diameter sheaves typical of most belowdecks trimming systems, reducing the overall length of the system and allowing installation into smaller spaces.