A pivoting retractable keel requires building a case in the central area of the cabin, conditioning the interior layout to this contingency. The MC 41SK is wide enough to allow the installation of a dinette on one side of the keel trunk, leaving room for a corridor to starboard, the passageway to the fore cabin.

The galley is placed to starboard of this corridor and is quite large, with plenty of space for a freezer, four burners stove with oven and double sinks installed in a long counter next to the topside. The dinette on the opposite side is L shaped and the table is conveniently hinged to the swing-keel trunk. Aft of the galley there is an office/chart table of good proportions, and further back the owner´s cabin, with a private head with separate shower stall.

The forward area has a private double berth and another head with separated shower stall to port, while an extra crew bunk is located to starboard. This some of our customers have transformed in extra storage space.

A detail in the layout worth mentioning is the large aft compartment abaft the aft-cabin heads, with access from the heads back-wall and from the cockpit. That place is ideal for storing bulky items, like sail bags, inflatable dinghies, and so on. If a power generator is installed, it should be fitted inside this compartment.

A flush foredeck, small cabin trunk and large cockpit make for a simple and functional deck arrangement. A large cockpit locker and a good-sized stern platform are provided for convenience and easy access to the water. The cockpit seat behind the wheel can be made removable or pivoting to facilitate access to the cockpit from the very spacious transom scoop, where dealing with diving gear or fish cleaning are easy tasks.

The Multichine 41SK is cutter rigged with spreaders swept aft, a feature that allows dispensing running backstays, a nuisance in cruising sailboats. This rig is simple and efficient, in our opinion the best choice for an offshore sailing. The two foresails fitted with roller-furling gears allow for infinity of adjustments, keeping the boat balanced in practically any condition, enhanced by the possibility of altering trim by changing the keel longitudinal position. The mainsail has its foot with moderate dimensions, representing less load on the steering system, especially on the autopilot, besides improving sail handling, mainly when jibing in heavy weather. With average sized sail area, the MC41SK is capable of performing good daily runs with minimum stress for the crew.

The swing keel solution employed in the MC 41SK is no doubt one of the hot features of the project. The working mechanism we adopted in the design is being successfully employed in many other boats of our design, functioning flawlessly even in the worst conditions. We specified a system to lift the keel in which two spectra ropes are pulled by a hydraulic piston. The great advantage of this system is to avoid damage in case of accidental collision, once the keel is free to swing up, and when it falls back, the impact is dissipated by a shock absorber.

The MC41SK has two options of rudders: twin rudders protected by skegs, which keep the draft low and allow for efficient control due to the increased rudder area and a fixed rudder placed behind a skeg, which protects the propeller blades when the boat is laying on a beach slope.

We opted for a non-retractable shallow (double or single) rudder of correct size, keeping the keel as the only retractable appendage, making the boat less dependent on complex systems.

With the same sail area as the one specified for the fin-keel version, the Multichine 41SK has a slightly heavier displacement than the other design, but on the other hand she is more stable than the MC41 when its swing keel is dropped.

Auxiliar propulsion recommended is a 50 to 55 HP diesel engine.