pitch anglen.

Brit.

/ˈpɪtʃ aŋɡl/, U.S.

/ˈpɪtʃ ˌæŋɡ(ə)l/

Origin: Formed within English, by compounding. Etymons: pitch n.², angle n.²

Etymology: < pitch n.² + angle n.²

1. The angle of inclination from the horizontal or vertical, or with respect to some reference plane; the angle relating or corresponding to the pitch (in various contexts).In quot. 1869, the angle of rotation corresponding to the pitch (tooth spacing) of a toothed wheel.

ΚΠ

1869 W. J. M. Rankine Man. Machinery & Millwork iii. iv. 575 A large worm-wheel..is made to gear with a tangent screw, by means of which it is successively turned through a series of angles, each equal to the pitch-angle.

1951 F. Whiteley Gear Manuf.: Bk. 4 (Assoc. Engin. & Shipbuilding Draughtsmen) i. 8 The pitch angle of any bevel gear is the angle between the axis and the cone generating line.

1981 M. A. Parker & F. Pickup Engin. Drawing (ed. 3) vi. 165 When the pitch angle is 90° the gear is a crown gear.

2003 IEEE Trans. Antennas & Propagation 51 661 An input impedance of approximately 50Ω is realized by appropriately selecting the diameter and pitch angle of the helical wire.

2. Aeronautics. The angle at which a propeller, rotor, or turbine blade is set with respect to the plane of rotation (the angle being measured between this plane and a straight line from one edge of the blade to the other in a direction perpendicular to its radius).

ΘΚΠ

society > travel > air or space travel > a means of conveyance through the air > aeroplane > parts of aircraft > means of propulsion > [noun] > aircraft engine > propeller > pitch

pitch angle1902

adjustable pitch1909

pitch control1930

pitch1944

1902 F. Walker Aërial Navigation v. 54 The value of θ..which gives the maximum efficiency is the same whatever be the actual pitch angle.

1935 C. G. Burge Compl. Bk. Aviation 140/1 The sections of the blade near the tip will move on a helix of much greater diameter..than those near the boss. For this reason they are set at a less ‘pitch angle’.., so that every part of the airscrew will try to move the same distance forward during one revolution.

1971 P. J. McMahon Aircraft Propulsion viii. 246 The pilot's control lever selects propeller pitch angle directly.

1990 D. Day Learning to fly Radio Control Helicopters (BNC) 20 Contact can occur with the throttle set at hovering power and the blades at a high pitch angle and lifting strongly.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	pitch angle
释义	pitch anglen. Brit. /ˈpɪtʃ aŋɡl/, U.S. /ˈpɪtʃ ˌæŋɡ(ə)l/ Origin: Formed within English, by compounding. Etymons: pitch n.², angle n.² Etymology: < pitch n.² + angle n.² 1. The angle of inclination from the horizontal or vertical, or with respect to some reference plane; the angle relating or corresponding to the pitch (in various contexts).In quot. 1869, the angle of rotation corresponding to the pitch (tooth spacing) of a toothed wheel. ΚΠ 1869 W. J. M. Rankine Man. Machinery & Millwork iii. iv. 575 A large worm-wheel..is made to gear with a tangent screw, by means of which it is successively turned through a series of angles, each equal to the pitch-angle. 1951 F. Whiteley Gear Manuf.: Bk. 4 (Assoc. Engin. & Shipbuilding Draughtsmen) i. 8 The pitch angle of any bevel gear is the angle between the axis and the cone generating line. 1981 M. A. Parker & F. Pickup Engin. Drawing (ed. 3) vi. 165 When the pitch angle is 90° the gear is a crown gear. 2003 IEEE Trans. Antennas & Propagation 51 661 An input impedance of approximately 50Ω is realized by appropriately selecting the diameter and pitch angle of the helical wire. 2. Aeronautics. The angle at which a propeller, rotor, or turbine blade is set with respect to the plane of rotation (the angle being measured between this plane and a straight line from one edge of the blade to the other in a direction perpendicular to its radius). ΘΚΠ society > travel > air or space travel > a means of conveyance through the air > aeroplane > parts of aircraft > means of propulsion > [noun] > aircraft engine > propeller > pitch pitch angle1902 adjustable pitch1909 pitch control1930 pitch1944 1902 F. Walker Aërial Navigation v. 54 The value of θ..which gives the maximum efficiency is the same whatever be the actual pitch angle. 1935 C. G. Burge Compl. Bk. Aviation 140/1 The sections of the blade near the tip will move on a helix of much greater diameter..than those near the boss. For this reason they are set at a less ‘pitch angle’.., so that every part of the airscrew will try to move the same distance forward during one revolution. 1971 P. J. McMahon Aircraft Propulsion viii. 246 The pilot's control lever selects propeller pitch angle directly. 1990 D. Day Learning to fly Radio Control Helicopters (BNC) 20 Contact can occur with the throttle set at hovering power and the blades at a high pitch angle and lifting strongly. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.1869
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