Ronstan's Series 55 Orbit Ratchets are the only ratchet blocks available in the market with both auto and manual enga- gement modes. The auto mode mecha- nism 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 exce- llent grip given by the sophisticated NC-machined sheave Generation 2 of Ronstan's patented sheave cross-hole geometry. The unique sheave design has 12 gripping faces in contrast with traditio- nal designs which only have 8 faces. Generation 2 design has straight resistan- ce 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' mains- heet 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|