Automatic and manual ratchet options
Now you can enjoy the flexibility of setting up your fitout exactly to suit yourself. Ronstan is the only company that offers a 40mm ratchet block with both auto and manual engagement models*
With automatic models, the ratchet mechanism engages when load is applied, but switches off when it's released. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers.
Manual modes allow the ratchet mechanism to be switched on or off as required. This is the preferred mainsheet set-up for many top sailors.
* Selected Series 40 models.
Quite simply, Ronstan Ratchet Orbit Blocks have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. The Series 40 delivers up to 14:1 holding power, almost double that of our nearest competititor.
The unique sheave design has 8 gripping faces which directly resist loaded line movement. Traditional designs have an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.
The Dyneemaź 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 pins.
The system is compatible with Dyneemaź/Spectraź strops, webbing and carbon connection points - much more so than steel loop tops or shackles.
With auto models the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. When engaged, and with manual models, the sheave cross - hole geometry eliminates the 'shuddering' ease-out that you can expect from traditional v-groove ratchet blocks.
Stand-up kits feature a clatter-free rubber boot. You can attach the Dyneemaź 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.
Smooth Easing of sheets
With auto models the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. When engaged, and with manual models, the sheave cross-hole geometry eliminates the 'shuddering' ease-out that you can expect from traditional v-groove ratchet blocks.
Hard anodised Aluminium
High compression strength carbon black Acetal
Toughened, glass fibre reinforced Nylon
UV stabilised, multi-strand impregnated SK75 Dyneemaź
LESS FRICTION, ULTIMATE PERFORMANCE
Ball Bearing Orbit Blocks boast the highest strength-to-weight
This is achieved through all-composite reinforced polymer materials and
a Dyneemaź rope link head. Their precision design allows the optimum
number of ball bearings in loaded areas and eliminates them in inactive
areas. Ineffective mass is reduced even further through fibre-reinforced
composites in the block head, cleat arms and beckets.
Series 20, Series 30, Series 40, Series 55, Series 70
- Kilogram for kilogram of working load, BB and RT 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 and becket block has a through-sheave
becket arrangement. The result? The lowest weight possible. Multi-sheave
blocks have only single intermediate cheeks 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.
Simple and secure attachment
- The Dyneemaź 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 pins. The system is compatible
with Dyneemaź/Spectraź strops, webbing and carbon connection points -
much more so than steel loop tops or shackles.
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 modeled to be
stress optimised. The Dyneemaź Link is produced from FSE Robline SK75
fibre, which is 10 times h6er and lighter than steel, and provides the
final connection from the block to the load point.
Low profile and compact
- The flexible Dyneemaź 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 height.
Sheave 40 mm