 The ship was constructed around a 50 @.@ 2 feet ( 15 @.@ 3 m ) long keel of 14 – 15 @-@ centimetre ( 5 @.@ 5 – 5 @.@ 9 in ) thickness , which is believed to have survived intact . The front of the ship had a 61 ° angle of rake at the bow where the stem post was joined to the keel with mortise and tenon joints and secured with 16 @-@ millimetre ( 0 @.@ 63 in ) diameter rope . The hull planks were stitched onto the frames and keel through holes spaced at 5 – 6 @-@ centimetre ( 2 @.@ 0 – 2 @.@ 4 in ) intervals . The boat had a keelson for added strength , which rested on the half @-@ frames . 
