Page 20 - Harken

Ratchamatic Blocks Ratchet or
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 2625
during jibes. 2625.RED 2680
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 block on Adjustable ratchet engagement adapts
the boom above a cockpit-mounted switchable ratchet to block to a variety of applications.
allow the mainsheet to run freely in light air and to double
holding power in heavy air.
Use the 2634 with a 402 or 403 swivel arm for a versatile 2628
two-speed mainsheet system. 2684
About Carbo Air blocks: see feature page at beginning of this section.

Eight-faceted, Hard Lube-anodized
aluminum sheave holds line securely.
2626
2681

All 57 mm and 75 mm Ratchamatic
2627 blocks are also available with Power3
2683 sheaves which offer holding power
options suitable for a variety of wind
conditions. In addition, all 57 mm
Ratchamatic blocks can be made with
HTE (high threshold engage) sheaves
to delay ratchet engagement, allowing
them to run freely more of the time.
2633 Contact Harken for more information.
2682
DN iceboat © Marcella Grunert
Sheave Shackle pin Max line Maximum Breaking Holding power
Part Ø Length Weight Ø Ø working load load w/180° wrap
No. Description in mm in mm oz g in mm in mm lb kg lb kg 50 lb (23 kg)
57 mm
2625 / .RED Single 2 1/4 57 4 1/16 103 3.7 104 3/16 5 3/8 10 500 227 2000 907 10:1
2626 Single/becket 2 1/4 57 4 15/16 125 4 113 3/16 5 3/8 10 500 227 2000 907 10:1
2627 Single/150 Cam-Matic** 2 1/4 57 4 1/16 103 9.4 266 3/16 5 3/8 10 300 136 750 340 10:1
2628 Single/150 Cam-Matic/becket** 2 1/4 57 4 15/16 125 9.7 275 3/16 5 3/8 10 600 272 1500 680 10:1
2633 Cheek* 2 1/4 57 3 1/4 83 3.1 89 3/8 10 500 227 2000 907 10:1
75 mm
2680 Single 2 15/16 75 5 3/8 137 8.4 238 1/4 6 7/16 12 750 341 3000 1361 15:1
2681 Single/becket 2 15/16 75 6 1/2 165 9 255 1/4 6 7/16 12 750 341 3000 1361 15:1
2682 Cheek* 2 15/16 75 4 1/16 103 6.5 184 7/16 12 750 341 3000 1361 15:1
2683 Single/150 Cam-Matic** 2 15/16 75 5 7/16 138 15.5 440 1/4 6 7/16 12 300 136 750 340 15:1
2684 Single/150 Cam-Matic/becket** 2 15/16 75 6 1/2 165 15.5 440 1/4 6 7/16 12 600 272 1500 680 15:1
*Includes RH fasteners and mounting pad. **Maximum working loads and breaking loads for blocks based on cam strengths.
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