Series 55 Ratchet Orbit Block™

 


Features

  • Up to 20:1 holding power
  • Smooth easing of sheets
  • High performance cleating
  • Easily fitted and securely retained Dyneema® Link head
  • Automatic & manual ratchet block
 

Sheave Ø55 mm
Max. Rope Ø10 mm
Max. Cable Ø- mm
Pin Ø- mm
M.W.L.250 kg
B. L.750 kg
Weight78 g

Product Information

Automatic ratchet block

Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In 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 for gybing asymmetric spinnakers. In manual mode, the ratchet mechanism can be switched on or off as required. This is the preferred mainsheet set-up for may top sailors. Try the block in both modes and see which you prefer - you really can't go wrong.

* Selected Series 55 models.
 

Awesome ratchet block holding power

Quite simply, Ronstan Ratchet Orbit Blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. Its holding power is up to 21:1, almost double that of our nearest competitior. 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. 

Click to view full Practical Sailor's Ratchet Click-off article 
 

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 pins. The system is compatible with Dyneema®/Spectra® strops, webbing and caron connection points - much more so than steel loop tops or shackles. 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.

Materials

  • Sheave: Hard anodised Aluminium
  • Ball Bearings: High compression strength carbon black Aceetal
  • Frame/Cheeks: Toughened, glass fibre reinforced Nylon
  • Rope Link: UV stabilised, multi-strand impregnated SK75 Dyneema®

Related Items

  Product No. Description
  RF2455 BB & RT Orbit Block™ Accessories,  ,  Stand-up base, suits S55 BB & RT, 
  RF50001 BB & RT Orbit Block™ Accessories,  ,  Retainer clip, S55 BB & RT single & fiddle Orbit Blocks™, 
  RF9004-08 BB & RT Orbit Block™ Accessories,  ,  Dyneema® link, S40 BB double & triple Orbit Blocks™, S55 BB & RT single & fiddle Orbit Blocks™, Ø4mm x ID 80mm,