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Type: Journal article
Title: Mechanics of flight in ski jumping: aerodynamic stability in pitch
Author: Marques-Bruna, P.
Grimshaw, P.
Citation: Sports Technology, 2009; 2(1-2):24-31
Publisher: Taylor & Francis
Issue Date: 2009
ISSN: 1934-6182
Statement of
Pascual Marques-Bruna and Paul Grimshaw
Abstract: This study examines aerodynamic stability in pitch in ski jumping. Static stability implies automatic return to trimmed flight after a sudden disturbance and dynamic stability involves gradual damping of oscillatory motion. Both have implications for flight control and safety. A 3‐D inertia model of a ski jumper and the Planica K185 jumping hill profile were constructed using computer‐aided design. Inertia, jump performance, and aerodynamic efficiency and stability parameters were computed for variations in V‐style posture using mathematical modeling. Pitching moment at a 01 angle of attack was positive, and the condition dM/dα <0 at equilibrium was satisfied, indicating that the athlete is inherently stable. Enhanced flight posture consists of a ski‐opening angle of 301 and a forward‐leaning angle of 101. This is a high‐lift configuration with a large static margin that triggers a steep dM/dα slope and high oscillatory frequency upon deviations from trimmed attitude. Mechanisms of stability in pitch are proposed, founded upon theoretical aerodynamics.
Keywords: aerodynamics
computer-aided design
ski jumping
Rights: Rights managed by Taylor & Francis
DOI: 10.1080/19346182.2009.9648495
Appears in Collections:Aurora harvest 5
Mechanical Engineering publications

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