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The 58' Fast Sailing Catamaran


60' Fast Sailing Catamaran - RADIAN - Kasten Marine Design, Inc.
Above Aft | Side View | Above Side | Side Fwd | Lines Perspective

Copyright 2003 - 2014 Michael Kasten

General Concept

Here is a prototype composite or aluminum fast sailing cat intended for ocean sailing. The overall notion is that this would be an ideal hull form for two couples, each having identical accommodation spaces below, plus comfortable shared spaces in the wheel house and on deck. The idea here is to have generous spaces, rather than to crowd a larger number of people into a lot of little spaces...!

A dedicated inside steering station is planned within the house, located on center forward. The house will contain a large galley to port aft and wrap-around settee to starb'd aft. A companionway on center will lead up and aft to the cockpit.  The large aft cockpit area is planned for fair weather "hanging out" and dining, as well as being the primary helm while sailing.

Inside, forward of the galley / settee will be two companionways leading below into each hull where there will be access aft to the engine room, and access forward to the sleeping cabins. The sleeping cabins will each have a king size berth, located within the bridge between the hulls, rather than down in the hulls. This is intended to keep the sleepers comfortable in a location where there is the least motion, and to also allow a view from each stateroom. Within each hull will be built in cabinets and a walkway leading forward to a "walk through" closet / bureau / dressing area, then forward to a private head.

Forward of each head compartment will be a watertight bulkhead, and beyond that a forepeak for storage, accessed from on deck.

The engines will be located aft of amidships in each hull, and will make use of V-drive gears. Aft of the engine space in each hull will be a generous lazarette containing the steering rams and light weight storage.  The intent with the transoms has been to provide maximum seakeeping, so there is no exposed stairwell while sailing.  Instead, they are to have a deployable stair / swim platform that lowers hydraulically, and when retracted blends into the transom. 

Preliminary dimensions of the RADIAN are as follows:

This hull form is intended for fast sailing.  The rig is planned as a high aspect fractional sloop rig.  Ideally the sails will be battened in order have a generous roach and somewhat elliptical profile.

As with any prototype design, the RADIAN 58 can be enlarged or made smaller to suit one's preferences.  For long range voyaging, more displacement would be in order with wider and deeper individual hulls, slightly greater overall beam, slightly greater freeboard and bridge deck clearance, and the stern would be revised in order to have less immersed transom area. If the stern were lengthened, a sugar scoop transom could be used with stairs leading to the water on each hull.  For voyaging, a ketch rig of more modest height would be an option worth considering.

58' Fast Sailing Catamaran - RADIAN - Kasten Marine Design, Inc.
Above Aft | Side View | Above Side | Side Fwd | Lines Perspective

For more information please inquire.