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Glossary of Aerodynamics Terms
beginning with letter R
Browse the Aerodynamics Glossary
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ramjet Tweet Definition of ramjet Like Definition of ramjet on Facebook
noun (Plural:ramjets)
  1. A jet engine in which its forward motion forces air into its inlet compressing it (as opposed to having a pump type device compressing the air for combustion with fuel).
ramp Tweet Definition of ramp Like Definition of ramp on Facebook
noun
  1. an inclined surface that connects two levels; an incline
  2. a mobile staircase that is attached to the doors of an airliner at an airport
  3. an American plant, Allium tricoccum, related to the onion
  4. (Appalachia) a promiscuous man or woman; a general insult for a worthless person
verb
  1. to behave violently; to rage
  2. to stand in a rampant position
rate-of-climb indicator Tweet Definition of rate-of-climb indicator Like Definition of rate-of-climb indicator on Facebook
noun
  1. an aircraft instrument that provides an indication of the vertical change in position
redline Tweet Definition of redline Like Definition of redline on Facebook
noun
  1. A drawing, document, etc. that has been marked for correction or modification.
  2. The maximum speed at which the engine in a car is designed to operate.
verb (redlin, ing)
  1. To mark a drawing or document for correction or modification.
  2. To run an internal combustion engine to its maximum or maximum recommended speed.
roll Tweet Definition of roll Like Definition of roll on Facebook
noun
  1. The act of rolling, or state of being rolled.
the roll of a ball
the roll of waves
  1. That which rolls; a roller
  2. Specifically, a heavy cylinder used to break clods.
  3. Specifically, one of a set of revolving cylinders, or rollers, between which metal is pressed, formed, or smoothed, as in a rolling mill; as, to pass rails through the rolls.
  4. That which is rolled up; as, a roll of fat, of wool, paper, cloth, etc.
  5. Specifically, a document written on a piece of parchment, paper, or other materials which may be rolled up; a scroll.
  6. Hence, an official or public document; a register; a record; also, a catalogue; a list.
  7. Specifically, a quantity of cloth wound into a cylindrical form; as, a roll of carpeting; a roll of ribbon.
  8. Specifically, A cylindrical twist of tobacco.
  9. A kind of shortened raised biscuit or bread, often rolled or doubled upon itself.
  10. (nautical) The oscillating movement of a vessel from side to side, in sea way, as distinguished from the alternate rise and fall of bow and stern called pitching.
  11. A heavy, reverberatory sound.
the roll of cannon
the roll of thunder
  1. The uniform beating of a drum with strokes so rapid as scarcely to be distinguished by the ear.
  2. (obsolete) Part; office; duty; rí´le.
  3. A measure of parchments, containing five dozen.
Quotations
  • 1882: Parchement is sold by the dozen, and by the roll of five dozens. — James Edwin Thorold Rogers, A History of Agriculture and Prices in England, Volume 4, p. 594.
    1. the rotation angle about the longitudinal axis
the roll of an aircraft
  1. The act of, or total resulting from, rolling one or more dice.
Make your roll.
Whoever gets the highest moves first.
  1. (nautical) The measure of extent to which a nautical vessel rotates on its fore-and-aft axis, causing its sides to go up and down. Compare with pitch.
verb
  1. (ergative) To cause to revolve by turning over and over; to move by turning on an axis; to impel forward by causing to turn over and over on a supporting surface.
roll a wheel, a ball, or a barrel
  1. To wrap round on itself; to form into a spherical or cylindrical body by causing to turn over and over.
roll a sheet of paper
roll clay or putty into a ball''
  1. To bind or involve by winding, as in a bandage; to inwrap; often with up
roll up a parcel
  1. (ergative) To drive or impel forward with an easy motion, as of rolling.
a river rolls its waters to the ocean
  1. (ergative) To utter copiously, especially with sounding words; to utter with a deep sound; -- often with forth, or out.
roll forth someone's praises
roll out sentences
  1. To press or level with a roller; to spread or form with a roll, roller, or rollers.
roll a field
roll paste
roll steel rails
  1. (ergative) To move, or cause to be moved, upon, or by means of, rollers or small wheels.
  2. To beat with rapid, continuous strokes, as a drum; to sound a roll upon.
  3. (geometry) To apply (one line or surface) to another without slipping; to bring all the parts of (one line or surface) into successive contact with another, in such a manner that at every instant the parts that have been in contact are equal.
  4. To turn over in one's mind; to revolve.
  5. (US slang) A manner of behaving or a way of doing certain things; a general disposition toward a situation.
I was going to kick his ass, but he wasn't worth getting all worked up over, I don't like that.
2006, Times Herald-Record, Tuesday, November 21, by Chris McKenna?. At http://www.recordonline.com/apps/pbcs.dll/article?AID=/20061121/NEWS/611210321.
:"This is how we in Spring Valley," one teen reportedly boasted.
  1. (transitive or intransitive) To throw dice.
  2. (transitive) To roll dice such that they form a given pattern or total.
If you doubles, you get an extra turn.
With two dice, you're more likely to seven than ten.
  1. To turn over and over.
The child rolled on the floor.
  1. To tumble in gymnastics.
  2. (nautical) when a nautical vessel rotates on its fore-and-aft axis, causing its sides to go up and down. Compare with pitch.
rotor Tweet Definition of rotor Like Definition of rotor on Facebook
noun
  1. A rotating part of a mechanical device, for example in an electric motor, generator, generator, alternator or pump.
  2. The wing of a helicopter or similar aircraft
rudder Tweet Definition of rudder Like Definition of rudder on Facebook
noun
  1. (nautical) An underwater vane used to steer a vessel. The rudder is controlled by means of a wheel, tiller or other apparatus (modern vessels can be controlled even with a joystick or an autopilot).
  2. (aircraft) A control surface on the vertical stabilizer of a fixed-wing aircraft or an autogyro. On some craft, the entire vertical stabilizer comprises the rudder. The rudder is controlled by foot-operated control pedals.
runway Tweet Definition of runway Like Definition of runway on Facebook
noun
  1. an airstrip, a (usually) paved section on which planes land or take off
  2. a narrow platform extending from a stage on which people walk, especially used by models in fashion shows
  3. the usual path taken by deer or other wild animals, i.e. from the forest to the stream
  4. a stream bed

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