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Glossary . . .just so we can all sing off the same page.

 

This Glossary is cross referenced with hyperlinks. Where appropriate, our web pages will contain hyperlinks to definitions provided by this Glossary. For example, if you are unsure about the meaning of a key-word or word, simply click on the hypertext and review the additional information. Use your browser's     button to return to your place in the current document.

 

acceleration of gravity. - Any acceleration due entirely to gravity, e.g., in a vacuum a freely falling body falls toward the earth's center at a velocity of 32.2 feet the first second, and an increased velocity of 32.2 feet per second the second second (velocity at the end of the second second is 64.4 feet per second, etc.). This is commonly expressed as 32.2 feet per second per second, or 32.2 feet per second square.
   In air the rate of acceleration is modified by the force due to tair resistance. A freely falling body will finally reach a speed at which the force of gravity and air resistance are equal and no greater speed is gained, i.e., terminal velocity

acceleration. - The rate of change of velocity and expressed in feet per second per second or miles per hour per second, or any other unit of speed divided by any unit of time. Acceleration has direction as well as magnitude, and is forward when the velocity is increased or backward (deceleration) when the velocity is decreased.

AME ®. - (abbr.) See Ashland Modified Epoxy resin.

Ashland Modified Epoxy ®. - A high performance Epoxy resin manufactured by the Ashland Chemical Company. (abbr.) AME.

browser. - A computer system which interprets HTML instructions and presents the information in a format that can (hopefully. . .) be easily read, navigated, and managed via an interface medium. Without the browser interface, internet operations would be much more difficult for the average user.

catalysis. - The speeding up or, sometimes, slowing down of a chemical reaction by adding a substance which itself is not changed or consumed in the process: therefore, the catalyst is returned, unchanged from the reaction; note that the liberation of the catalyst may not be apparent, as it may evaporate during the reaction (e.g., curing or kicking) process. Factors such as temperature, pressure, and humidity will affect the reaction time.

catalyst. - A substance serving as the agent in catalysis.

center of gravity. - The point within a solid body through which, for balance purposes, the total force due to gravity is considered to act.

ceramic. - An inorganic compound or mixture requiring heat treatment to fuse it inot a homogeneous mas usually possissing high temperature strenght but low ductility. Types and uses range from china for dishes to refractory liner for nozzles.

chopper gun FRP construction. - adj. - A technique of FRP fabrication that utilizes a phenumatic pressure operated gun mechanism that feeds a continuous thread of glass fiber, from a roll, into the delivery stream of resin, while chopping the fiber, at the delivery gun, into uniform small lengths. This technique is cost-effective for non-structural application, and with regard to structural marine applications, is considered to be inferior to hand-layed methods.

composite materials. - Structural materials of metals, ceramics, wood, or plastics with built-in strengthening agents which may be in the form of filaments, foils, powders, or flakes of a different compatible material.

crystaline. - adj. A solidified form of a substance having plane faces (facets) arranged in a symmetrical, three dimensional pattern.

deadrise. - The included angle between the bottom of the cross-section of a boat hull and the horizontal plane, usually measured at the transom.

drag. - (Symbol D). A retarding force acting upon a body in motion through a fluid, parallel to the direction of motion of the body. It is a component of the total fluid forces acting on the body.

epoxy. - Designating a resin used in strong, resistant glues, enamels, etc.

epoxy resin. - (See epoxy.)

ester. - An organic compound formed by the reaction of an acid and an alcohol.

ethylene. - A colorless, flammable, gaseous, double bonded, two-carbon hydrocarbon. A very useful organic chemistry building block, that is easily polymerized. Also known as vinyl.

fiberglass. - Various material made from finespun filaments of glass.

Fiberglass Reinforced Plastic. - Generally, any of the various structural plastic mixtures characterized by the reinforcement of a plastic resin with fiberous glass filaments. (abbr. FRP)

fluid. - A substance which, when in static equilibrium, cannot sustain a shear stress; a liquid or a gas. This concept is only approximated by actual liquids and gases.

FRP. - (abbr.) See Fiberglass Reinforced Plastic.

force. - The cause of the acceleration of material bodies measured by the rate of change of momentum produced on a free body.
  The product of mass multiplied by acceleration; i.e., F=MA.

gell coat. - 1. n.The finished-surface resin layer of an FRP product. 2. v. to apply the gell coat.

glass. - A hard, brittle substance, usually transparent, made by fusing silicates with soda, lime, etc. Glass, an interesting substance, in its solid state, is not crystaline, and is considered to be a super-cooled liquid.

gravity. - 1. Viewed from a frame of reference fixed in the earth, force imparted by the earth to a mass which is at rest relative to the earth. Since the earth is rotating, the force observed as gravity is the resultant of the force of gravitation and the centrifugual force arising from this rotation and the use of an earthbound rotating frame of reference. It is directed normal to sea level and to its geopotential surfaces.
   The magnitude of the force of gravity at sea level decreases from the poles, where the centrifugal force is zero, to the equator, where the centrifugal force is a maximum but directed opposite to the force of gravitation. This difference is accentuated by the shape of the earth, which is nearly that of an oblate spheroid of revolution slightly depressed at the poles. Also, because of the asymmetric distribtion of the mass of the earth, the force of gravity is not directed precisely toward the earth's center.
   The magnitude of the force of gravity is usually called either gravity, acceleration of gravity, or apparent gravity.
   2. acceleration of gravity. 3. By extension, the attraction of any heavenly body for any mass; as Martian gravity.

hand-layed. - An FRP fabrication technique of laminating individual layers of fiber glass textile fabric such as, woven roving, or mat, and other coring materials, often labor intensive and accomplished by manual labor.

HTML. - (abbr). See Hyper Text Markup Language

hyperlink. - The actual jump path of an HTML link (see hypertext), which may or may not be revealed by the apparent text of the hypertext.

hypertext. - A (block) of text, identified and described by the syntax of HTML, as a link or shortcut, to another location either within a current document, or elsewhere on the World Wide Web.

Hyper Text Markup Language. - Text markup language (and variants of. . .) currently used on the World Wide Web. HTML is not a programming language; conversely, it is a text formatting syntax that combines special sequences of characters with regular text, to indicate or markup the associated regular text for enhanced presentation on various media systems, such as a video display screen, document printer, or audio translator. The marked text is interpreted by a browser system.

key-word. - A significant word, often associated with hypertext cross-reference capability, and often included in search argument lists.

kick. - (Colloq.). The event or observation of the onset and hardening process associated with the curing of a catalized liquid resin.

mass. - (symbol m). A quantity characteristic of a body, which relates the attraction of this body toward another body. Since the mass of a body is not fixed in magnitude, all masses are referred to the standard kilogram, which is a lump of platinum. Mass of a body always has the same value; weight changes with change in the acceleration of gravity.

mass flow rate per unit area. - (symbol G). In fluid dynamics, the product of fluid density p and the linear velocity of the fluid v or G=pv

magnitude. - Amount; size; greatness.

mold. - 1. A hollow form for giving a certain shape to something plastic or molten. 2. A frame (as opposed to hollow) on which something is modeled. 3. A pattern; model. 4. Something formed in or on a mold. 5. Distinctive character -- vt 1. To make in or on a mold. 2. To form; shape.

monocoque. - A type of construction, as of an aluminum aircraft fuselage or rocket body, in which all or most of the stresses are carried by the skin. Sometimes used to describe the unit-body method of automobile construction where the engine, drive train and body are assembled as a unit, without the incorporation of a frame or chassis.

momentum. - Quantity of motion. Linear momentum is the quantity obtained by multiplying the mass of a body by its linear speed. Angular momentum is the quantity obtained by multiplying the moment of inertia of a body by its angular speed.
   The momentum of a system of particles is given by the sum of the momentums of the individual particles which make up the system or by the product of the total mass of the system and the velocity of the center of gravity of the system.
   The momentum of a continuous medium is given by the integral of the velocity over the mass of the medium or by the product of the total mass of the medium and the velocity of the center of gravity of the medium.

NACA. - (abbr). National Advisory Committee for Aeronautics. The predecessor of NASA.

nozzle. - A duct, tube, pipe, spout, or the like through which a fluid is directed and from the open end of which the fluid is discharged, designed to meter the fluid or to produce a desired direction, velocity, or shape of discharge.

parasitic drag. - The resistance (drag) of a fluid, produced by any part of a body in motion that does not product lift or thrust.

plastic. - 1. Molding or shaping matter; formative. 2. That can be molded or shaped. 3. Made of a plastic -- n. Any of various nonmetallic compounds, synthetically produced, which can be molded and hardened for commercial use.

polyester resin. - A polymeric ester resin used in making plastics, fibers, etc.

polyethylene. - Designating, or of any of a group of polymerized ethylene compounds. (same as polyvinyl)

polymer. - A substance consisting of giant molecules formed from smaller molecules of the same kind -- i.e., polymerized.

polymerized. - see polymer.

polyvinyl. - Designating, or of any of a group of polymerized vinyl compounds.(same a polyethylene)

polyvinyl resin. - A plastic resin compounded from polyvinyl.

refractory. - A material, usually ceramic, that resists the action of heat, does not fuse at high temperatures, and is very difficult to break down.

resin. - A natural substance exuded from various plants and trees, or a synthetic substance with similar properties, and used in varnishes, plastics, etc..

scalar. - Any physical quantity whose field can be described by a single numerical value at each point in space. A scalar quantity is distinguished from a vector quantity by the fact that a scalar quantity possesses only magnitude, whereas a vector quantity possesses both magnitude and direction.

shear strength. - In materials, the stress required to produce fracture in the plane of cross section, the conditions of loading being such that the directions of force and resistance are parallel and opposite although their paths are offset a specified minimum amount.

skinned. - An fabrication technique referring to the lamination of a composit material (often and typically, plywood) between layers of FRP.

speed. - Rate of motion. Rate of motion in a straight line is called linear speed, whereas change of direction per unit time is called angular speed. Speed and velocity are often used interchangeably although some authorities maintain that velocity should used only for the vector quantity.

squeegee. - 1. n. An edged tool for scraping a liquid from a surface. 2. v. to squeegee.

starboard. - n. [OE. steoran, to steer (the old rudder was on the right side)] the right side of a ship, etc. as one faces forward --adj. of or on the starboard.

strain. - The deformation produced by a stress divided by the original dimension.

stringer. - A slender, lightweitht, lengthwise fill-in structural member in a rocket body, or the like, serving to reinforce and give shape to the skin.

stress. - 1. The force per unit area of a body that tends to produce a deformation. 2. The effect of a physiological, psychological, or mental load on a biological organism which causes fatigue and tends to degrade proficiency.

structural foam. - Any of the various foam materials with structural qualities. Regarding marine applications, will almost always contribute to the total USCG and NMMA flotation requirements.

synthetic. - 1. of or involving synthesis. 2. produced by chemical synthesis, rather than of natural origin. 3. not real; artificial --n. something synthetic.

vector. - 1. A quantity, such as a force, velocity, or acceleration, which has both magnitude and direction at each point in space, as opposed to a scalar which has magnitude only. Such a quantity may be represented geometrically by an arrow of length proprtional to its magnitude, pointing in the assigned direction. 2. A heding issued to an aircraft (or boat) to provide navigational guidance by radar. For air Intercept and Close Air Support and Air Interdiction usage, alter heading to magnetic heading indicated. Heading ordered must be in three digits; e.g., "vector" zero six zero (for homing use "steer").

vinyl. - Any of various compounds of ethylene, polymerized to form resins and plastics (i.e., polyvinyl or polyethylene plastics).

velocity. - (symbol V). 1. speed. See note. 2/ A vector quantity equal to speed in a given direction. In sense 1, velocity is often used synomymously with speed, as in the velocity of the airplane, but in such contexts speed is properly the preferred term; except in the compound airspeed, velocity is preferred to speed in reference to motion of air or other fluid.

weight. - (symbol w.). 1. The force with which a body is attracted toward the earth. 2. The product of the mass of a body and the acceleration acting on a body. In a dynamic sutuation, the weight can be a multiple of that under resting conditions. Weight also varies on other planets in accordance with their gravity.

weight flow rate. - Mass flow rate multiplied by gravity

World Wide Web. - Essentially, . . .the internet. This was not invented by Al Gore. It all began with Brian W. Kernighan and Dennis M. Ritchie, in 1969, at Bell Telephone Lab's Murray Hill, NJ Research Center. Before PC's and Microsoft ©, they invented the UNIX © computer operating system and the C programming language, and used DEC PDP-11 computers. AT&T had mandated that their people invent a system of electronically networking their intracompany data systems, i.e., computers, in order that they, i.e., the computers, could communicate with each other, basically for the purpose of exchanging data files, and intraoffice documents, e.g., e-mail. The protocalls that were eventually standardized are called TCP/IP (Transaction Communications Protocall/Internet Protocall). The DOD (Department of Defense) became enamored of the system and a lot of money changed hands over the span of three or four decades, and today, we have the likes of AOL, ad nauesum.

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