Results 11 to 20 of about 460 (265)
The aerodynamics of a spinning shell [PDF]
Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1920 The paper to which this abstract is meant to serve as a non-technical introduction contains the results of work undertaken at the request of the Ordnance Committee and is published with their permission. (1) The Problems of Experimental External Ballistics .—A spinning shell moving through the air is subjected in ...
Ralph Howard Fowler +3 more
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X. The aerodynamics of a spinning shell [PDF]
Philosophical Transactions of the Royal Society of London. Series A, Containing Papers of a Mathematical or Physical Character, 1921 This paper contains the results, theoretical and experimental, of work undertaken, at the request of the Ordnance Committee, by the authors as Technical Officers of the Munitions Inventions Department. Permission to publish such parts as appear to be of general scientific interest has now been granted by the Ordnance Committee and the Director of ...
Ralph Howard Fowler +3 more
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Nonlinear Model and Ballistic Impact of Body Aerodynamics for Canard Dual-Spin Aircraft [PDF]
AerospaceTargeting the nonlinear issues of the canard dual-spin aircraft, which relies on the high-speed rotation of the afterbody for flight stability and achieves trajectory correction by adjusting the roll angle of the low-speed rotating forebody to alter ...
Xinxin Zhao +3 more
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Investigating the Knuckleball Effect in Soccer Using a Smart Ball and Training Machine [PDF]
Sensors, 2022 The term knuckleball in sporting jargon is used to describe a ball that has been launched with minimal spin, resulting in a trajectory that is erratic and unpredictable.
David Eager +3 more
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A comparison of Jabulani and Brazuca non-spin aerodynamics [PDF]
A comparison of Jabulani and Brazuca non-spin aerodynamics, 2014 Wind-tunnel experimental measurements of drag coefficients for non-spinning Jabulani and Brazuca balls are presented. The Brazuca ball’s critical drag speed is lower than that of the Jabulani ball, and the Brazuca ball’s super-critical drag coefficient is larger than that of the Jabulani ball.
John Eric Goff +2 more
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Relativistic aerodynamics of spinning black holes [PDF]
Physical Review DAstrophysical black holes do not exist in vacuum, and their motion is affected by the galactic environment. As a black hole moves it attracts stars and matter, creating a wake that, in turn, exerts an effective friction slowing down the black hole. This force is known as dynamical friction, and has significant consequences, ranging from the formation ...
Conor Dyson +3 more
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Spiraling light: from donut modes to a Magnus effect analogy [PDF]
Nanophotonics, 2021 The insight that optical vortex beams carry orbital angular momentum (OAM), which emerged in Leiden about 30 years ago, has since led to an ever expanding range of applications and follow-up studies. This paper starts with a short personal account of how
Spreeuw Robert J. C.
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VII. The aerodynamics of a spinning shell.—Part II [PDF]
Philosophical Transactions of the Royal Society of London. Series A, Containing Papers of a Mathematical or Physical Character, 1922 In a previous paper the authors, with others, have described observations of the angular oscillations of the axis of a 3-inch shell over the first 600 feet from the muzzle of the gun, and from an analysis of the observations have obtained information about the forces due to the air.
Ralph Howard Fowler, C. N. H. Lock
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Fundamental Aerodynamics of Non-spinning Soccer Ball
Korean Journal of Sport Science, 2010 홍성찬, 아사히 타케시
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A study of spin effects on tennis ball aerodynamics
Due to complex surface structure, the aerodynamic behaviour of a tennis ball is significantly different compared to other sports balls. This difference is more obvious when spin is involved. Although several studies have been conducted on drag and lift in steady state condition (no spin involved) by the authors and others, little or no studies have ...
Firoz Alam +4 more
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