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INSTRUCTIONS

How to attach Ronstan Orbit™ strop, webbing and lashing blocks: strop and guide line, the two webbing options, typical lashing layouts and when the central hole may be used as a becket.

DocumentRonstan Orbit Strop, Webbing & Lashing Blocks Instructions
FormatPDF · 2 pages · 1.0 MB
LanguageEnglish
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Ronstan Orbit Strop, Webbing & Lashing Blocks — Instructions

Orbit™ Strop Block

  • Secure the block to a padeye, boom or other fixture with a load bearing fibre rope strop or lashing of appropriate strength, passing through the central hole in the block.
  • Fit a guide line through the small holes in the head of the block: it holds the main lashing in place and stops the block body rotating.
  • The strop or lashing must let the block align itself to the resultant force. Too short, and it may not allow enough articulation or alignment – this can damage the block or bearings.
  • The central hole of the strop block must not be used as a becket or dead-end attachment point.

Option 1 – Through the Alignment Slots

  • Step 1: the first pass of webbing goes through the centre hole and the alignment slots. It only keeps the block aligned with the load: secure it independently, with less tension than the following passes.
  • Step 2: the second and following passes carry the main block load and do not pass through the alignment slots.
  • All passes of the webbing MUST go through the central hole.

Option 2 – Sailmaker's Seizing

  • All passes go through the central hole only, not the alignment slots.
  • Keep the block aligned with the load with a sailmaker's seizing right around the webbing strop and through the slots in the alignment guides.
  • The more common method: it lets the block sit as close as possible to its fixing point (deck padeye, etc.).
  • All passes of the webbing MUST go through the central hole.

Orbit™ Lashing Block

  • Secure the block to a padeye, boom or other fixture with a load bearing fibre rope lashing of appropriate strength through the central hole, plus a guide line through the small holes in the head to hold the lashing and stop the block rotating.
  • The lashing must let the block align itself to the resultant force; too short can damage the block or bearings.
  • Typical installations: lashing passes once through the hub; twice through the hub; or twice through the hub and spread.
  • On the lashing block the central hole can also take the becket dead-end of the sheet in a 3:1 purchase system.

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