Do you need to replace or upgrade a part on your boat? There can be a lot of options to choose from, but we’ve got a resource to help you out! This infographic shows you exactly what part goes where on the Opti. The red numbers show the Harken part numbers of the blocks and other equipment. Use this tool whenever you’re curious about where parts go or if you need a replacement.

Want to learn more? Explore other One-Design Deck Layouts here:

Optimist Systems:


Reeve Spectra® line through a snap clip to attach this trick block to the bridle. Use the same line to form a becket on which to deadend the mainsheet.


The Opti hook-in block allows sailors to precisely adjust halyard tension. Glass-filled nylon shell saddles mast to keep block aligned. Free-rolling 16 mm sheave with stainless steel balls handles high loads.


Harken Hook-in Halyard Block available through an Optiparts dealer. Dealer listings at

About the Optimist:

program because of the city’s flat terrain, they looked for a sailing alternative. In 1947 Clark Mills designed the Optimist Pram, a home-built plywood dinghy that cost less than $50. It caught on quickly. In 1958, Axel Damgaard brought the trainer to Denmark where it was modified and renamed the International Optimist Dinghy. Today, this eight-foot, sprit-rigged boat is the only International Sailing Federation approved dinghy for sailors under 16 years of age.

Boat Specifications

Length: 7 ft 61/2 in (2.31 m)
Width: 3 ft 8 in (1.13 m)
Weight: 77 lb (35 kg)
Sail Area: 33 sq ft (3 sq m)

Learn more:


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What exactly is a Blockhead? If you are totally obsessed with how to rig and sail your boat, you might already be one! Join the community of Blockheads to learn more about the sport, engage with others and share sailing experiences. This site serves as the hub for Blockheads globally, where you can discover how to join, media, tips and tricks, contests, and events. This program is all about YOU and we want to hear from everyone! Not seeing something? Your feedback is crucial, feel free to shoot us a comment or message.