Boat plug, hull plug, deck plug etc

http://www.f-boat.com/pages/News2/FM-Factory2010.html

http://www.youtube.com/watch?v=YfgkuJ8GNts

http://www.fiberlay.com/howto/issue1.htm (pattern is used here too)

http://www.selway-fisher.com/boat_building_methods.htm



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Note added at 2 days19 hrs (2012-03-12 08:06:23 GMT)
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I’ve done a little rooting around to see if there is any concensus differentiating usage of the terms “pattern” and “plug”. Apart from being reminded that “master” is also a common term for “plug”, both “pattern” and “plug” seemed to be used pretty interchangeably. The reason I am more familiar with “plug”, may be due to the fact that I am much most familiar with composite construction and terminology ; although a couple of glossaries mark no difference, one glossary does say that “plug” is a composite industry term for “pattern” or “model”. GLossaries being what glossaires are, and companies compying a glossary from one place to another, who know where what seems to be a repeated glossary started out in the first palce.

Irens and Pennfornis use "plug", so do most of the builders and architects I've worked with in the past. Then I suppose again that one person starts using a given term and the others follow! Plug and pattern are no doubt interchangeable.

http://www.fiberglasssupply.com/pdf/miscellaneous/Glossary.p...
Pattern : the initial model for making fiberglass molds.
Master (Plug) : the tool used to build molds for the manufacture of fiberglass Parts
Plug : See Master - Both terms used to imply the same meaning. Form identical in shape to the finished object over which a mold is fabricated

http://www.fgci.com/pdf/GLOSSARY OF TERMS.pdf
Master (Plug) : The permanent tool used to build molds for the manufacture of fiberglass parts.

http://www.precisioneering.com/glossary_definitions.htm
MASTER (plug) : A full scale representation of the intended part, usually retained as a reference and the part from which production molds are made
PATTERN : The initial model for making fiberglass molds. See PLUG.
PLUG : A composite industry term for a pattern or model.

http://www.occupationalinfo.org/80/806684086.html
TITLE(s): MOLD LAMINATOR (concrete prod.; ship-boat mfg.) alternate titles: plug-and-mold finisher

Builds up layers of fiberglass and resin over plug (wooden or plaster pattern) to form molds for plastic product sections or to be used in casting concrete products, using handtools and portable power tools: Fills cracks, depressions, and holes on plug surface with plastic filler material and sandpapers plug to smooth surface. Applies and buffs wax on plug to obtain glossy surface. Brushes surface of plug with water-soluble parting agent to facilitate removal of mold. Covers plug with fiberglass cloth and trims off excess cloth with shears.