Fleet 1 Information‎ > ‎SJ21 Boat‎ > ‎


The Mark I was the original.  It featured a stepped deck and large cockpit  The cabin bulkheads are 14" further forward on the MK I than the MK II so the cockpit is larger and the cabin is smaller.  Somewhere between hull #40 and #75, they started to add the spinnaker and Genoa winch on the combings. The cabin on the MK I does not sit flush with the hull giving a very small place to put your foot on the MK I.  Also, all MK I's had an aluminum side brace inside the cabin to stabilize the keel trunk.