The Harken Power3 ratchet is offered in 57 mm and 75 mm sheave sizes; this guide covers the 57 mm block, offered in three interchangeable holding-power levels — 10:1 (Standard, Black), 15:1 (1.5x, Titanium), and 20:1 (2x, Silver) — so you can match grip to the day's wind and waves. Choose lighter holding power for smooth easing in light air and heavier holding power when strong, steady breeze demands maximum grip.
Power3 holding power at a glance
| Version | Color | Holding power | Best conditions |
|---|---|---|---|
| Standard | Black | 10:1 | Light to medium air; frequent, smooth ease and trim |
| 1.5x | Titanium | 15:1 | Breezy, puffy conditions; quick easing when a puff hits |
| 2x | Silver | 20:1 | Strong, steady wind where maximum holding power is mandatory |
What is a Harken Power3 ratchet block?
A ratchet block lets line run freely one way but grips it in the other, so a sailor can hold a loaded sheet with far less hand effort. The Power3 range packages this into 57 mm and 75 mm blocks (this guide covers the 57 mm size), each with three selectable ratchet levels. As Harken lead engineer Matt Schmidt put it, "The standard black ratchet has been a wonderful all-purpose choice for years. Harken now offers sailors three ratchet choices with 10:1, 15:1, or 20:1 holding power. This allows skippers to synchronize their rigging selections and sailing style to whatever the weather has in store for them on race day."
How does holding power work?
Holding power expresses how much hand force is needed to hold a loaded line. At 10:1, holding 100 lb of load on the sheet takes only about 10 lb of grip; at 20:1 that same load needs just 5 lb. Higher holding power means less fatigue in a blow, but the more aggressive sheave facets used to achieve it can increase line wear depending on line composition and cover texture.
Which Power3 ratchet should I choose?
Pick by the day's breeze. In light to medium air choose the Standard 10:1 (Black) so you can ease and trim the sheet smoothly and often; it is friendly to any type of line. In breezy, puffy conditions step up to the 1.5x 15:1 (Titanium) to boost holding power and ease quickly when a puff hits. In strong, steady wind where holding power is mandatory, run the 2x 20:1 (Silver) for the firmest grip on any size or type of line.
What configurations are available?
The 57 mm Power3 ratchets covered here come in a switchable version, a shackled Ratchamatic, and a T2 soft-attach Ratchamatic. Ratchamatic blocks automatically switch the ratchet on under load and off when the line goes slack, so easing stays light while holding stays strong. All Power3 ratchets can be purchased individually, and switchable ratchets are also available in two-packs of the 1.5x and 2x versions.
Frequently asked questions
What does the Power3 color coding mean?
Color identifies the ratchet level: Black is Standard 10:1, Titanium is 1.5x (15:1), and Silver is 2x (20:1) holding power.
Does higher holding power wear line faster?
It can. The more aggressive sheave facets on the 1.5x and 2x ratchets grip harder, which may increase line wear depending on the line's composition and cover texture.
What size is the Power3 ratchet?
Power3 ratchet blocks are offered in 57 mm and 75 mm sizes; this guide covers the 57 mm block, which comes in switchable, shackled Ratchamatic, and T2 soft-attach Ratchamatic configurations.
What is a Ratchamatic block?
A Ratchamatic block automatically engages the ratchet under load and disengages it when the line goes slack, so you get easy easing and trimming plus strong holding without flipping a switch.
Can I buy Power3 ratchets individually?
Yes. All Power3 ratchets are available individually, and the switchable ratchets also come in two-packs of the 1.5x and 2x versions.
Which version is best for one-design racing?
Match the version to the day: Standard for light to medium air, 1.5x for puffy breeze, and 2x for strong steady wind. Many one-design sailors carry more than one to fine-tune their setup by conditions.
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