Method for making an earth pit mold for a plastic boat hull

Claim 1

A METHOD FOR MAKING A MOLD FOR REPRODUCTION IN PLASTIC CONSTRUCTION OF PROTOTYPE HULL OR THE LIKE, WHICH METHOD INCLUDES THE STEPS OF: PREPARING A SURFACE OF SAID PROTOTYPE HULL WITH A COATING OF WATER-SOLUBLE MOLD RELEASE MATERIAL; DEPOSITING A MOLD LINER LAYER OF PLASTIC MATERIAL OVER SAID MOLD RELEASE COATING; ATTACHING FURRING SPACERS TO SAID PLASTIC COATING; CURING SAID LINER COATING; ATTACHING REINFORCING MEANS TO SAID FURRING MEANS; SUPORTNIG SAID PROTOTYPE HULL IN AN UPWARDLY OPENING POSITION IN AN EARTH PIT HAVING SIDES SPACED AWAY FROM THE OUTER COATED SIDES OF SAID HULL PARTLY BY SUSPENSION FROM ABOVE AND PARTLY BY RESTING THE LOWERMOST SURFACE OF SAID HULL IN A PAD OF SOFT CONCRETE IN THE BOTTOM OF SAID PIT; SPRAYING A WET CONCRETE MIXTURE OVER THE PLASTIC COATING, AND SAID REINFORCING AND FURRING MEANS, ON THE OUTER SURFACES OF SAID HULL TO MAKE A RIGID MOLD SUPPORT STRUCTURE IN THE FORM OF A CONCRETE SHELL INTEGRAL WITH SAID LINER LAYER; AFTER SAID CONCRETE SHELL HAS HARDENED, FILLING THE SPACE IN SAID EARTH PIT OUTSIDE THE SHELL WITH PACKED EARTH TO FIRMLY SUPPORT SAID MOLD; AND INTRODUCING WATER BETWEEN THE OUTER SURFACE OF SAID PROTOTYPE HULL AND SAID MOLD LINER LAYER, TO WASH AWAY SAID WATER SOLUBLE MOLD RELEASE MATERIAL AND PERMIT THE WITHDRAWAL OF SAID PROTOTYPE HULL.

Claim 2

A METHOD FOR MAKING A MOLD FOR REPRODUCTION IN PLASTIC CONSTRUCTION OF PROTOTYPE HULL OR THE LIKE, WHICH METHOD INCLUDES THE STEPS OF: PREPARING A SURFACE OF SAID PROTOTYPE HULL WITH A COATING OF WATER-SOLUBLE MOLD RELEASE MATERIAL; DEPOSITING A MOLD LINER LAYER OF PLASTIC MATERIAL OVER SAID MOLD RELEASE COATING; ATTACHING FURRING SPACERS TO SAID PLASTIC COATING; CURING SAID LINER COATING; ATTACHING REINFORCING MEANS TO SAID FURRING MEANS; SUPORTNIG SAID PROTOTYPE HULL IN AN UPWARDLY OPENING POSITION IN AN EARTH PIT HAVING SIDES SPACED AWAY FROM THE OUTER COATED SIDES OF SAID HULL PARTLY BY SUSPENSION FROM ABOVE AND PARTLY BY RESTING THE LOWERMOST SURFACE OF SAID HULL IN A PAD OF SOFT CONCRETE IN THE BOTTOM OF SAID PIT; SPRAYING A WET CONCRETE MIXTURE OVER THE PLASTIC COATING, AND SAID REINFORCING AND FURRING MEANS, ON THE OUTER SURFACES OF SAID HULL TO MAKE A RIGID MOLD SUPPORT STRUCTURE IN THE FORM OF A CONCRETE SHELL INTEGRAL WITH SAID LINER LAYER; AFTER SAID CONCRETE SHELL HAS HARDENED, FILLING THE SPACE IN SAID EARTH PIT OUTSIDE THE SHELL WITH PACKED EARTH TO FIRMLY SUPPORT SAID MOLD; AND INTRODUCING WATER BETWEEN THE OUTER SURFACE OF SAID PROTOTYPE HULL AND SAID MOLD LINER LAYER, TO WASH AWAY SAID WATER SOLUBLE MOLD RELEASE MATERIAL AND PERMIT THE WITHDRAWAL OF SAID PROTOTYPE HULL.