It has a masthead sloop rig, a raked stem, a reverse transom and a skeg-mounted rudder controlled by a wheel.
[1][3] The boat is fitted with a Westerbeke diesel engine of 33 hp (25 kW) for docking and maneuvering.
The galley is at the foot of the companionway steps on the port side and includes a three-burner alcohol-fired stove and oven, an ice box or refrigerator under the cockpit and a pressurized water supply.
The boat may be optionally equipped with a boom vang and a spinnaker, including associated hardware and winches.
[3] In a 1994 review Richard Sherwood wrote of the Mark I, "the hull and rig are designed for speed, while the cabin arrangement is comfortable for cruising.