The
Firefly 850 Sports is designed to be built using the strip
plank sandwich construction method utilizing 10mm Western
Red Cedar planks as the core with 230 gr/m2 Unidirectional
Fiberglass (230 UNI) laid at 90 degrees across the planks
as the laminate. Extra layers of 230 UNI are utilized
for added reinforcement at strategic areas around the
beams with added layers of 200 gr/m2 Plain Weave Cloth
below the waterline and on the bows for added grounding
protection. Hulls and Decks are built as separate items
over temporary MDF or plywood frames.
Alternatively hulls and decks could be built in foam sandwich
construction with a saving of about 100 kgs. on the finished
boat.
Bulkheads, bunks aft decks and swim steps are all 12.7
mm Corecell or Divinycell with 195gr/m2 Carbon Twill Cloth
on either side. Internal lockers are of 10mm Corecell
with 300PWC on the upper or outer face and 200PWC on the
lower or inner face. The cockpit deck is 16mm Corecell
or Divinycell with 400 gr/m2 Double Bias Cloth outside
and the 195gr/m2 Carbon Twill Cloth inside. Alternatively,
300gr/m2 Plain Weave fiberglass cloth could be used instead
of the 195gr/m2 Carbon Twill with a weight gain of approximately
25 kgs.
