Ronstan BB OrbitBlock RF25109 Series User Instructions Download Page 3

lashing line down 

through the head, 

out through the 

cheek and 

through the hub. 

lashing line in 

through the 

opposite cheek 

and back up 

through the 

head. 

line over the fixing 

point. Pass back 

down through the 

head and out the 

same cheek it last 

passed through. 

through the hub, in through 

opposite cheek and up 

through the head. Repeat 

steps 1.2.1 to 1.2.3 if more 

than one strand is required. 

lashing with 

appropriate knot, 

splice or 

whipping. 

1.3 End Attachment 

  

  

  

 

1.3.1 Pass the 

lashing line down 

through the head 

and out through 

the cheek. 

1.3.2 Pass 

lashing line 

through the hub. 

1.3.3 Pass lashing 

line in through the 

opposite cheek and 

back up through the 

head. 

1.3.4 To finish attachment 

tie a bow line above the 

block. Note: Knot must be 

a non-slipping (non-

tightening) knot. 

1.3.5 For the 

ultimate clean 

finish use an eye 

splice. 

1.4 Large Diameter Object 

Attachment 

  

  

  

 

1.4.1 

1.4.2 

1.4.3 

  

  

Where attachment to a large diameter object, wider than the head of the block, is required (eg. a boom) 

the lashings must cross each other between the head of the block and the object. Four strands of lashing 

are required to prevent the block twisting and creating a poor lead. The strands from one side of the block 

should be to the outside and the strands from the other side passing between them. See diagram 1.4.3. 

 

2.0 BECKET OPTIONS 

A through-hub can be used as a becket for up to 3mm (1/8”) lines. A take-off becket can be created with the 

lashing line for use with 4-6mm (5/32” - 1/4”) sheet lines. 

Summary of Contents for BB OrbitBlock RF25109 Series

Page 1: ...embly Block Lashing is generally limited by the strength of the rope and the joining method Knots splices stitching etc will generally have a lower Breaking Load than the rope itself It is possible to use up to 4mm 5 32 lashing line for lashing the RF25109 running the lashing around as a single strand but a neater result with more secure knotting can be achieved by using the smaller line size prov...

Page 2: ...s the lashing line down through the head and out through the cheek 1 1 3 Pass lashing line in through the opposite cheek and back up through the head 1 1 4 Pass lashing line around fixing point Repeat steps 1 1 1 to 1 1 3 if more than one strand is required to meet desired breaking load 1 1 5 Finish lashing with appropriate knot splice or whipping 1 2 Attachment at 90 transverse 1 2 1 Pass the 1 2...

Page 3: ...ack up through the head 1 3 4 To finish attachment tie a bow line above the block Note Knot must be a non slipping non tightening knot 1 3 5 For the ultimate clean finish use an eye splice 1 4 Large Diameter Object Attachment 1 4 1 1 4 2 1 4 3 Where attachment to a large diameter object wider than the head of the block is required eg a boom the lashings must cross each other between the head of th...

Page 4: ...eets up to 3mm 1 8 It is possible for the lashing to be used as the becket and sheet line also 2 1 Through Hub Becket for sheets up to 3mm 1 8 2 1 1 Attach block to fixing point as per lashing option 1 1 to 1 4 2 1 2 Pass the sheet end through the hub and secure with a bowline or eye splice 2 2 Lashing Used as Becket for Sheet Lines 4mm 5 32 to 6mm 1 4 ...

Page 5: ...iate knot splice or whipping Attach the sheet to the becket loops using a bow line or splice 2 3 Single Line Used as Becket Sheet Line for Sheets up to 3mm 1 8 2 3 1 Pass the line in through a cheek up through the head around the fixing point back down through the head and out through the opposite cheek 2 3 2 Pass both ends through the hub in opposite directions 2 3 3 Finish lashing with appropria...

Page 6: ...ve a precisely engineered bearing system that should be kept clean and free of sand and grit to ensure optimum performance and service life Blocks in particular the bearing areas should be flushed with fresh water regularly and periodically cleaned with a mild detergent and water Dry lubricants such as Ronstan Sailfast silicon spray may be used to lubricate the bearing system Oil petrochemical bas...

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