With the correct mast butt position, headstay length, "J" measurement, and shroud tensions, your J-105 will have the correct mast bend and forestay sag to accommodate your new set of Ullman Sails through a wide range of conditions.

J/105 Original Booms use Hall Spars HS- (x), Or Sparcraft FB-220 (5 1/8" x 3 7/8") Boom Sections. J/105 Parts for Hall Spars Masts & Booms are listed below.

Jun 20, 2018 · If you are planning to crew as mast man this is what you will need to know to make sure the spinnaker runs as effectively as possible during every hoist and douse.

Shop J/105 sailboat parts, rigging, and accessories from the experts at West Coast Sailing. Rigging guides, technical information, extensive selection, and fast shipping to help you get back out on the water.

The straight mast will also allow for the most projected mainsail area as roach is pushed out to back of the sail. All this rig tuning is done to allow the mast to fit your sails and for your sails to be as flexible as possible to work through the entire wind range.

The easiest way to check mast butt position is to check your mast pre-bend with the forestay set. With normal shroud tension, your spar should have 1⁄2” or slight pre-bend.

The most unique feature of your J/105 is the J/Sprit system for the asymmetric gennaker. We believe this system is a major improvement over conventional systems and so let’s start by explaining how it works!

J105 Rigging & Specifications

J/105 Technical specifications & dimensions- including layouts, sailplan and hull profile.

The light air performance of the J/105 can be dramatically improved with leeward mast sag in under 12 knots. This is side-to-side sag from the partners to the hounds.