RF25109 Series 20 BB Orbit Block™

Ronstan BB Orbit Blocks™ feature a unique Lashing head. Building on the latest trends in grand prix dinghy and ocean racing, it replaces the steel head post and shackle arrangement of traditional blocks.

IMPORTANT: In order to meet breaking loads this block must be lashed with the lashing, strop or link passing through the hub.

The lashing must be passed down through the head, out through the cheek, through the hub, back in through opposite cheek and back up and out through the head. Repeat for lines, sizes that require more than one strand to meet load rating.

The Maximum Working Load and Breaking Load of the assembly (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 provided (e.g. 1.7 - 2mm) passed through multiple times. The RF25109 Series 20 Orbit Block™ is supplied with 750mm (30”) of 1.7mm (1/16”) diam. covered Dyneema® lashing line.

For best results, the lashing must be attached to a mounting point with a smooth, well rounded profile.

Avoid attaching directly to fittings with sharp edges or rough surfaces that may damage the lashing through abrasion or point loading. For this situation use a shackle with a smooth surface between the lashing and the fitting. Regularly inspect the lashing for damage, if found replace immediately.

Attachment at 0°

OR

Attachment at 90°

OR

Line end attachment

OR

Large diameter object attachment*

1.1.1 Pass the lashing line down through the head and out through the cheek.

1.1.2 Pass 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.

1.2.1 Pass the lashing line down through the head, out through the cheek and through the hub.

1.2.2 Pass lashing line in through the opposite cheek and back up through the head.

1.2.3 Loop lashing line over the fixing point. Pass back down through the head and out the same cheek it last passed through.

1.2.4 Pass lashing line 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.

1.2.5 Finish lashing with appropriate knot, splice or whipping.

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 bowline above the block. Note: Knot must be a non-slipping (non-tightening) knot.

OR

1.3.5 For the ultimate clean finish use an eye splice.

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.

Through Hub Becket For sheets up to 3mm (1/8”).

OR

Lashing Used as Becket For sheets 4-6mm (5/32” - 1/4”).

OR

Lashing Used as Becket and Sheet Line For sheets up to 3mm (1/8”). It is possible for the sheet to be used as the lashing as well as the becket.

2.1.1 Attach block to fixing point as per lashing option 1.1 to 1.4.

2.1.2 Pass the lashing line down through the head and out through the cheek.

2.2.1 Pass the lashing line down through the head, out through the cheek and through the hub.

2.2.2 Loop under the bottom of the block and again though the hub.

2.2.3 Repeat step 2.2.2 if more than one loop is required to meet the desired breaking load. Pass line in through the far side cheek and back up through the head.

2.2.4 If another loop is required to meet breaking load, loop the line around fixing point, pass it back down through the head, out through the near side cheek, through the hub, back in through the far side cheek and back up through the head.

2.2.5 Finish lashing with appropriate knot, splice or whipping. Attach the sheet to the becket loops using a bowline or splice

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 appropriate knot, splice or whipping. If a knot is used it must not be a ‘slip’ knot, and the knot must be such that it pulls equally on each line leading up to the hub. A bowline is ideal. Note: the breaking load of the installed block is dependent on the breaking load of the line; up to a maximum B.L. of 550kg (1210lb). Knots, splices, stitching, etc. will generally have a lower breaking load than the rope itself.