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A resin transfer molding core has an outer surface and internal communication passages. One internal communication passage has an inlet opening and at least one discharge opening extending through the outer surface of the core. At least a second internal communication passage has a discharge opening

A resin transfer molding core has an outer surface and internal communication passages. One internal communication passage has an inlet opening and at least one discharge opening extending through the outer surface of the core. At least a second internal communication passage has a discharge opening extending through the outer surface of the core and at least one inlet opening. A preform comprises the core with fiber reinforcement material on the outer surface.

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1. A resin transfer molding core comprising a substantially solid body of polyurethane foam having an outer surface and a plurality of internal communication passages formed by flexible plastic tubes embedded within said core, at least a first of said internal communication passages having an inlet

1. A resin transfer molding core comprising a substantially solid body of polyurethane foam having an outer surface and a plurality of internal communication passages formed by flexible plastic tubes embedded within said core, at least a first of said internal communication passages having an inlet opening at a resin injection port area in the outer surface of said core and at least one discharge opening extending through the outer surface of said core, and at least a second of said internal communication passages having an inlet opening at said resin injection port area and having at least one discharge opening extending through the outer surface of said core. 2. A resin transfer molding preform for a resin transfer molding process comprising: a core comprising a substantially solid body of polyurethane foam having an outer surface and a plurality of internal communication passages formed by flexible plastic tubes embedded within said core, at least a first of said internal communication passages having an inlet opening at a resin injection port area in the outer surface of said core and at least one discharge opening extending through the outer surface of said core, and at least a second of said internal communication passages having an inlet opening at said resin injection port area and having at least one discharge opening extending through the outer surface of said core; and fiber reinforcement material affixed to said outer surface of said core. 3. A resin transfer molding core having an outer surface and comprising a plurality of internal communication passages formed by tubes embedded within the core, at least a first of said internal communication passages having an inlet opening and at least one discharge opening extending through the outer surface of said core, and at least a second of said internal communication passages having a discharge opening extending through the outer surface of the core and at least one inlet opening. 4. The resin transfer molding core of claim 3, wherein said core comprises a substantially solid body of foam. 5. The resin transfer molding core of claim 4, wherein said foam is structural polyurethane foam. 6. The resin transfer molding core of claim 3, wherein said tubes comprise flexible plastic. 7. A resin transfer molding preform for a resin transfer molding process, said preform comprising: a core having an outer surface and comprising a plurality of internal communication passages within said core, at least a first of said internal communication passages formed by tubes embedded having an inlet opening and at least one discharge opening extending through the outer surface of said core, and at least a second of said internal communication passages having a discharge opening extending through said outer surface of the core and at least one inlet opening; and fiber reinforcement material affixed to said outer surface of said core. 8. A resin transfer molding core having an outer surface and comprising a plurality of internal communication passages formed by tubes embedded within the core, at least a first of said internal communication passages having an inlet opening at a resin injection port area in the outer surface of said core and at least a second of said internal communication passages having an inlet opening at said resin injection port area and having at least one discharge opening extending through the outer surface of said core. 9. The resin transfer molding core of claim 8 wherein said core comprises a substantially solid body of foam. 10. The resin transfer molding core of claim 8 wherein said tubes comprise flexible plastic. 11. A resin transfer molding preform for a resin transfer molding process, said preform comprising: a core having an outer surface and comprising a plurality of internal communication passages within said core, at least a first of said internal communication passages having an inlet opening at a resin injection port area in the outer surface of said core and at least one discharge opening extending through the outer surface of said core, and at least a second of said internal communication passages having an inlet opening at said resin injection port area and having a discharge opening extending through said outer surface of said core; and fiber reinforcement material affixed to said outer surface of said core. 12. The resin transfer molding preform of claim 11 wherein said resin injection port area is recessed from an immediately adjacent portion of said outer surface of said core. 13. A resin transfer molding core comprising a substantially solid body of polyurethane foam having an outer surface and comprising a plurality of internal communication passages formed by flexible plastic tubes embedded within the core, at least a first of said internal communication passages having an inlet opening and at least one discharge opening extending through the outer surface of said core, and at least a second of said internal communication passages having a discharge opening extending through the outer surface of the core and at least one inlet opening. 14. A resin transfer molding preform for a resin transfer molding process, said preform comprising: a core comprising a substantially solid body of foam having an outer surface and comprising a plurality of internal communication passages formed by flexible plastic tubes embedded within said core, at least a first of said internal communication passages having an inlet opening and at least one discharge opening extending through the outer surface of said core, and at least a second of said internal communication passages having a discharge opening extending through said outer surface of the core and at least one inlet opening; and fiber reinforcement material affixed to said outer surface of said core.