Ronstan BB Orbit Block RF25109 20 Series User manual

Correct Attachment
Incorrect Attachment
CONTENTS:
1.0 Lashing Options
2.0 Becket Options
3.0 Care & Maintenance
4.0 Definitions
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
custom lashing, strop or link passing through the hub.
• The line 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 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”) line for lashing the RF25109
running the lashing around as a single strand, but a neater result with more secure
knotting can often be achieved by using a smaller line size (e.g. 2mm) wound
through multiple times.
• 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.
RF25109 Series 20 BB Orbit Block™ ,
Lashing Head User Instructions

1.0 LASHING OPTIONS
1.1.1 1.1.2 1.1.3 1.1.4 1.1.5
Pass the line down through the
head and out through the cheek. Pass line through the hub. Pass line in through the opposite cheek and back up
through the head.
Finish lashing with appropriate
knot, splice or whipping.
Pass line around fixing point.
Repeat steps 1.1.1 to 1.1.3
if more than one lashing is
required to meet desired
breaking load.
1.1 Attachment at 0° (in-line)
1.1
Attachment at 0° 1.2
Attachment at 90° 1.3
Line end attachment Large diameter
object attachment
(Must have at least 2 strands)
1.4
1.2.1 1.2.2 1.2.3 1.2.4 1.2.5
Pass the line down through the
head, out through the cheek and
through the hub.
Pass line in through the
opposite cheek and back up
through the head.
Loop line over the fixing point.
Pass back down through the
head and out the same cheek it
last passed through.
Finish lashing with appropriate
knot, splice or whipping.
Pass 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
lashing is required.
1.2 Attachment at 90° (transverse)

1.4.3
1.3.1 1.3.2 1.3.3 1.3.4 1.3.5
Pass the line down through the
head and out through the cheek. Pass line through the hub. Pass line in through the opposite cheek and back up
through the head.
For the ultimate clean finish use
an eye splice.
To finish attachment tie a bow
line above the block. Note: Knot
must be a non-slipping (non-
tightening) knot.
1.3 Line End Attachment
1.4.1 1.4.2
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. More than one strand of lashing is required to prevent the block twisting and
creatinfg 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.
1.4 Large Diameter Object Attachment

2.2 2.32.1
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.
Through-Hub Becket
For sheets up to 3mm (1/8”). Lashing Used as
Becket
For sheets 4mm (5/32”) to
6mm (1/4”).
Lashing Used as
Becket and Sheet Line
For sheets up to 3mm (1/8”). It
is possible for the lashing to be
used as the becket and sheet
line also.
2.1.1 2.1.2
Attach block to fixing point as
per lashing option 1.1 to 1.4. Pass the sheet end through the hub and secure with a bowline
or eye splice.
2.1 Through-Hub Becket - for Sheets up to 3mm (1/8”)

2.2.1 2.2.2 2.2.3 2.2.4 2.2.5
Pass the line down through the
head, out through the rear side
cheek and through the hub.
Loop under the bottom of the
block and again though the hub. 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.
Finish lashing with appropriate
knot, splice or whipping. Attach
the sheet to the becket loops
using a bow line or splice.
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 Lashing Used as Becket - for Sheets Line 4mm (5/32”) to 6mm (1/4”)
2.3 Single Line Used as Becket & Sheet Line - for Sheets up to 3mm (1/8”)
2.3.1 2.3.2 2.3.3
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.
Pass both ends through the hub
in opposite directions. 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 miximum B.L. of 550kg
(1210lb). Knots, splices,
stitching, etc. will generally have
a lower breaking load than the
rope itself.

3.0 CARE AND MAINTENANCE
4.0 DEFINITIONS
Lashing attachment
• To receive the maximum performance benefit from the Lashings, they must be used correctly installed, inspected regularly and replaced
when required.
• Lashings must be attached to a mounting point with a smooth, well rounded profile without sharp edges or burrs. If in doubt, use a
shackle with a smooth surface between the Lashing and the mounting point.
• Lashings will eventually suffer degradation from fatigue, wear and UV exposure. Like all running and standing rigging, Lashings should be
inspected as a part of your regular boat maintenance program and replaced if they show significant wear or fibre damage.
Orbit Blocks™
• Grit and sand will damage bearing systems. Ronstan Orbit Blocks™ have 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 based lubricants
must not be used.
• Ronstan Orbit Blocks™ are designed and manufactured for applications on sailboats.
• See the INFO section of the Ronstan web site and our catalogue for important customer considerations and warranty information.
BB = Ball Bearing MWL = Maximum Working Load BL = Breaking Load
Dyneema®is a trademark of Royal DSM NV.
DSM is the inventor and manufacturer of Dyneema®, the world’s strongest fibre™. “Dyneema®”, and “Dyneema®, the world’s strongest
fibre™” are trademark(s) (applications) owned by Royal DSM NV.