RONSTAN Orbit Blocks - Ball Bearing
Size 70 - Overview
Kilogram for kilogram of working load, Ronstan Series 70
Ball Bearing Orbit Blocks™ are
the world’s lightest. To gain peak performance, we engineered
out the heavy steel load straps, head post, shackle, full-length
fasteners, and cleating accessories. Through extensive research
and development, we replaced virtually all metal components with
high-tech polymers and fibre equivalents.
The unique orbital design allows the bearing to only be in the
active areas of the floating sheave. This minimises the mass
of the inactive return race and hub.
Weight and bulk are further reduced in the different block configurations.
The ball bearing single with becket and double with becket blocks
have a through-sheave becket arrangement. The result? The lowest
Double blocks also have only a single intermediate cheek and
an ultra-light and efficient head arrangement. This gives a 30%
weight saving advantage over the nearest competitor. Other brands
just link together their single blocks. This results in unnecessary
double cheeks between each sheave, held together by a heavy steel
channel across the top of the block.
Highest working load in its class.
The orbital ball-bearing arrangement gives the largest possible
bearing race diameter. This maximises load performance. The proven
Ronstan 2-stage bearing system features high compression grade
acetal ball bearings and a secondary full-contact bearing. This
gives minimum friction across the full working load range.
The floating sheave and bearing system is supported by a fibre-reinforced
load frame. The design was computer modelled and optimised using
stress analysis. The Dyneema® Link is produced from FSE Robline
SK75 fibre, which is 10 times stronger and lighter than steel,
and provides the final connection from the block to the load
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
The system is compatible with Dyneema®/Spectra® strops,
webbing and carbon connection points - much more so than steel
loop tops or shackles.
Low profile and compact.
The flexible Dyneema® Link provides controlled rotation and
0° or 90° orientation. It connects directly to the head
of the block rather than to an intermediate head post. This reduces
weight and gives the lowest possible profile while allowing full
articulation. Beckets have been carefully designed to minimise
Low profile stand-up kit allows 0° or 90° alignment.
The RF2457 stand-up kit features a clatter-free rubber boot.
You can attach the Dyneema® link so that the block is aligned
with the stand-up base or across it. It’s a neat, low-profile
solution which allows full articulation.
Ronstan Series 70 BB Orbit Blocks
We at Mauri Pro Sailing are fully committed to be your Ronstan Series 70 BB Orbit Blocks specialist not only providing the sailing community with a comprehensive and easy to use web site but with all the appropriate technical information that you might need to select your sailboat hardware and equipment. If you need any assistance selecting the appropriate Ronstan Series 70 BB Orbit Blocks
please contact us. Our crew is ready to help!
Pictures and text courtesy of the manufacturer.