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Old 28-09-2011, 19:15   #1
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Join Date: Jan 2011
Location: Georgian Bay, Ontario, Canada
Boat: CS36 Traditional
Posts: 551
Windlass Mount - GRP Strength


I am trying to determine the number of layers of woven and roving Fibreglass to layup to support a windlass that is being installed into my anchor locker on a shelf.

Perhaps you can provide some direction for me please?

Here is the plan:
  • The motor will be enclosed on three sides and the bottom with a single sheet of plywood (each)
  • The back side will remain open to maintain access to the motor
  • The plywood will be sealed in epoxy to prevent water intrusion
  • The structure will be fibreglassed using West Systems epoxy to the floor of the anchor locker and to the underside of the deck on one side
  • The anchor locker floor is composed of roughly 1/4" of GRP over plywood
  • The deck consists of GRP and balsa core and at the point of contact is about 6" from the gunwale

I have determined that GRP has a tensile strength of 300MN/M2 but I don't know how to translate that into the number of layers that I need to layup. I figure I need to target the maximum pull of the windlass at 2200lb.

To help with visualization, I have sketched in the proposed mount into a picture of the locker and also with the final product will hopefully look like.

BTW, the locker cover will be cut in half with the forward section being semi-permanently affixed.

Thanks for any guidance you can provide.
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