Dyna is a yawl, 57 feet 5 inches over all, 40 feet on the waterline with a 13-foot 7-inch beam and a 5-foot 6�-inch draft (9 feet with centerboard down). She displaces 48,100 pounds (normal for her size), of which the hull, masts and basic fittings weigh only 20,000, allowing Dyna to carry an 18,000-pound ballast keel for stability and pack 10,000 pounds of the good things of cruising life aboard. In her crew's quarters (just aft of the clothes locker in the very bow) is one hinged pipe berth with a head and folding lavatory to port and a hatchway ladder running up the door of the watertight bulkhead which serves to keep the ship afloat in case a bow-on collision ruptures the hull. The forward cabin has two wide, comfortable berths (head on portside not shown) and a large hanging locker aft of starboard berth. Main cabin has four bunks, doubles as dining room with lower bunks as seats. Main cabin bathroom (indicated above on portside with mast passing through one corner) has shower, lavatory, head. Main cabin also has two large hanging lockers, one at each end of the starboard bunks. Galley has double sinks aft and three-burner alcohol stove (not shown) on portside forward of sinks. Icebox and huge refrigerator (drawn in look-through technique) on portside show roominess of boat. Very few yachts under 70 feet have both. Across from galley, chart table sits on top of chart drawers just forward of sail bin. Cockpit (aft of the main hatch) sits over aluminum bulkhead (holes are to reduce weight). Aft in cockpit, wheel and binnacle which encloses the navigating compass are conveniently placed on same pedestal as engine controls. Handles of coffee grinder winch for trimming genoa jib show above deck at stern. Centerboard drops down through slot in cast iron ballast keel (shown in cutaway) and in hollow aluminum keel plate which holds Monel propeller shaft.