The photo above is a Twiggy Mk1 from France

This presentation documents the construction of a modified version of Lock Crowther's famous Twiggy Mk 2 trimaran

Sunday, June 1, 2014

Mainhull frame 11 cutouts and reinforcing



these cutouts (not in the plans) will give easy access to the 15"D x 20"H x 70"L storage space between frame 10 and  frame 11, which sandwich the rear beam 



  • the forward side of frame 11 has cedar stock reinforcement to compensate for any weakening caused by the cutout - the cedar added weighs about the same as the plywood cut out
  • the 10" high crossbeam fits in the space above the cedar stock
  • 1/4" plywood dividers installed between frames 10/11 will create 4 separate storage spaces, one for each cutout - the dividers will glue into 1/4" slots visible in the cedar stock
  • a 1/4" curved plywood 'ceiling' will be installed on the top of the cedar stock (under the bottom of the beam)
  • a 3/8" plywood 'shelf' will be installed under the bottom of the frame 10/11 top sections, from gunnel to gunnel
  • the dividers, 'ceiling' and 'shelf' will further strengthen the frame 10/11 structure 'egg carton style'
  • the 'ceiling' will provide a water tight seal under the beam and when folded

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