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Ronstan's Series 55 Orbit Ratchets
Ronstan's Series 55 Orbit Ratchets are the only ratchet blocks available in the market with both auto and manual engagement modes. The auto mode mechanism engages when load is applied, but switches off when it is released. The mechanism relieves the effort of holding the line load during extended periods of time but also helps the line run out smoothly when easing sheets and gybing asymmetric spinnakers. The manual mechanism lets the sailor switch on or off as required, which is preferred by more experienced sailors.
The Orbit Ratchets can hold lines up to 10 mm which are mostly used in boats up to 26 feet. It has the highest holding power available (up to 37 kg) thanks to the excellent grip given by the sophisticated NC-machined sheave Generation 2 of Ronstan's patented sheave crosshole geometry. The unique sheave design has 12 gripping faces in contrast with traditional designs which only have 8 faces. Generation 2 design has straight resistance faces which both distribute the load and minimize rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.
Series 55 Orbit Ratchets are also in the top list of lightest ratchet blocks in the market (82g). Series 55 Orbit Ratchets are ideal for single crewed small dinghies' mainsheet systems, other medium sized dinghies, small keelboats and sportsboats' spinnaker sheet systems and halyard, vang and backstay applications.
|International 14||Skiff||14||Mainsheet, Shroud Tensioning System|
|Melges 20||Keel||20||Mainsheet, Spinnaker and Jib System|
|J24||Keel||24||Mainsheet and Spinnaker System|
|Viper 640||Sport Boat||21||Mainsheet, Spinnaker|
|Mechanism Power||Auto + Mechanical|
|Holding Power||82 lbs|
|Maxium Working Load||784.43 kg|
|Safe Working Load||249.48kg|
|Sheave||Hard Anoised Aluminium|
|Ball Bearings||Carbon Black Acetal|
|Frame/Cheeks||Glass Fiber Reinforced Nylon|
|Rope Link||Sk75 Dyneema|
|Head Fitting||Grade 316 Stainless Steel|
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