RONSTAN Orbit Blocks - Ratchet
Size 70 - Overview
Automatic ratchet block.
The auto mode of the ratchet mechanism engages when load is applied,
but switches off when it's released. This lets the sheet run
out smoothly and freely-great for rapid easing of the sheet and
gybing asymmetric spinnakers.
Awesome ratchet block holding power.
Quite simply, Ronstan Series 70 Ratchet Orbit Blocks™ have
the highest holding power available. The sophisticated NC-machined
features Generation 2 of our patented sheave cross-hole geometry.
Its holding power is up to 21:1, almost double that of our nearest
The unique sheave design has 12 gripping faces which directly
resist loaded line movement. Traditional designes have only 8
faces with an angled resistance to line movement. Our Generation
2 design has straight resistance faces which both distribute
the load and minimise rope wear. These faces are offset from
the radial line, to draw the rope down into the gripping area
when under load.
Simple and secure attachment. The Dyneema® Link
is easily fitted and is retained securely by a moulded retainer
clip. The flexible link can be left with
one end attached to the block when fitting - no more lost shackle
The system is compatible with Dyneema®/Spectra® strops,
webbing and caron connection points - much more so than steel
loop tops or shackles.
Smooth easing of sheets.
In auto mode, the sheet runs out smoothly and freely sas soon
as the ratchet mechanism disengages. In manual mode, the sheave
cross-hole geomtry eliminates the 'shuddering' run-out that you
can expect from traditional v-groove ratchet blocks.
Ronstan Size 70 Ratchet Orbit Blocks
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Pictures and text courtesy of the manufacturer.