Harken 57mm and 75mm Carbo Ratchamatic
The Carbo Ratchamatic®
is a load-sensing ratchet block that rolls freely in both directions
under low loads and automatically engages the ratchet as loads
increase. Shifting between ratchet and light-air modes is seamless.
Unloaded main and jib sheets run out freely during mark roundings
and asymmetrical spinnakers free instantly during jibes.
Ratchet engagement may
be adjusted to a higher or lower load according to strength and
sailing style. The Ratchamatic® cheek block mounts on either port
or starboard. The holding power of the 57 mm is as high as 10:1. The
75 mm is up to 15:1. For the ultimate system, mount a Ratchamatic®
on the boom above a cockpit-mounted switchable ratchet to allow the
mainsheet to run freely in light air and to double holding power in
Use the 2634 with a 402
or 403 swivel arm for a versatile two-speed mainsheet system.