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.

Boat	Type	LOA (ft)	Application
Optimist	Centreboard	8	Mainsheet
Moth	Centreboard	11	Mainsheet
Sunfish	Centreboard	14	Mainsheet
International 14	Skiff	14	Mainsheet, Shroud Tensioning System
Finn	Centreboard	15	Mainsheet, Traveler
470	Centreboard	16	Mainsheet, Spinnaker
49er	Skiff	16	Mainsheet, Spinnaker
Melges 20	Keel	20	Mainsheet, Spinnaker and Jib System
J24	Keel	24	Mainsheet and Spinnaker System
Viper 640	Sport Boat	21	Mainsheet, Spinnaker

Criteria	Feature
Sheave Size	55mm
Weight	82g
Max Line	10mm-3/8in
Mechanism Power	Auto + Mechanical
Holding Power	82 lbs
Pin	5mm
Maxium Working Load	784.43 kg
Safe Working Load	249.48kg

Part	Material
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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