Results 1 to 10 of about 149 (149)
Investigation of the Aerodynamic Drag of Baseballs with Gyro Spin [PDF]
The 13th Conference of the International Sports Engineering Association, 2020 The following considers drag measurements of baseballs with backspin (spin axis horizontal and normal to trajectory) and gyro spin (spin axis parallel to trajectory) orientations. Balls were propelled through still air in a laboratory setting at 36 m/s and spin ranging from 1250 rpm to 1750 rpm.
Jeff Kensrud, Lloyd V. Smith, Bin Lyu
openaire +3 more sources
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
openaire +4 more sources
Aerodynamic Analysis of a Spinning Missile with Dithering Canards [PDF]
Journal of Spacecraft and Rockets, 2002 A generic spinning missile with dithering canards is used to demonstrate the utility of an overset structured grid approach for simulating the aerodynamics of rolling airframe missile systems. The approach is used to generate a modest aerodynamic database for the generic missile.
Tor A. Nygaard, Robert L. Meakin
openaire +2 more sources
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.
C. N. H. Lock, Ralph Howard Fowler
openaire +2 more sources
A comparison of Jabulani and Brazuca non-spin aerodynamics [PDF]
Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology, 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
openaire +2 more sources
Aerodynamic thermal analysis of a spinning winged projectile
Case Studies in Thermal Engineering, 2022 Aerodynamic heating of spinning flight vehicles have critical military applications such as flight testing, location tracking, stealth, and thermal protection. Based on the numerical method which is verified to be effective in the wind tunnel tests, this article discusses the aerodynamic thermal characteristics of a spinning winged projectile. Firstly,
Jun Zhang +6 more
openaire +2 more sources
Experimental determination of the aerodynamic coefficients of spinning bodies
The Aeronautical Journal, 2019 ABSTRACTTo accurately predict the probabilities of impact damage to aircraft from runway debris, it is important to understand and quantify the aerodynamic forces that contribute to runway debris lofting. These lift and drag forces were therefore measured in experiments with various bodies spun over a range of angular velocities and Reynolds numbers ...
S. Nguyen +4 more
openaire +4 more sources
Aerodynamic characteristics of an ogive-nose spinning projectile
Sādhanā, 2018 This work experimentally investigates the Robins–Magnus effect on a 5-caliber spinning projectile at a low subsonic Mach number of 0.1 corresponding to a Reynolds number of 3.2 × 105 based on the model length. The model configuration tested was a cylinder with spherically blunt tangent ogive nose portion.
T. J. S. Jothi, J Lijin
openaire +3 more sources
Experimental studies of the aerodynamics of spinning and stationary footballs [PDF]
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2008 The accurate discrimination of the aerodynamic parameters affecting the flight of sports balls is essential in the product development process. Aerodynamic studies reported to date have been limited, primarily because of the inherent difficulty of making accurate measurements on a moving or spinning ball.
Roy Jones +3 more
openaire +2 more sources
Relativistic aerodynamics of spinning black holes
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
openaire +5 more sources