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Propeller control for takeoff of a heavily loaded coaxial compound helicopter

Y. Zhao Orcid Logo, Ye Yuan Orcid Logo, R. Chen Orcid Logo, X. Yan Orcid Logo

The Aeronautical Journal, Pages: 1 - 18

Swansea University Author: Ye Yuan Orcid Logo

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DOI (Published version): 10.1017/aer.2023.7

Abstract

Although a coaxial compound helicopter can takeoff without propeller in the normal condition, the distance should be as short as possible for obstacle avoidance when the vehicle operates in a confined area with heavy loads. Therefore, a suitable propeller control is required to improve the takeoff p...

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Published in: The Aeronautical Journal
ISSN: 0001-9240 2059-6464
Published: Cambridge University Press (CUP)
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URI: https://cronfa.swan.ac.uk/Record/cronfa63018
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Abstract: Although a coaxial compound helicopter can takeoff without propeller in the normal condition, the distance should be as short as possible for obstacle avoidance when the vehicle operates in a confined area with heavy loads. Therefore, a suitable propeller control is required to improve the takeoff performance while the total power consumption is no more than the available power. The path is predicted by applying trajectory optimisation. Several varying takeoff parameters, including attitude, liftoff speed and obstacle height, are considered for optimum global performance. Three path indicators are proposed. Apart from typical distance and pilot workload, path sensitivity is quantified based on deviation from takeoff parameter variation. Results indicated that low propeller thrust at hover and moderate allocation on the propeller through flight is recommended. The aircraft achieves significantly improved takeoff performance compared to flight with pure rotors while maintaining the maximum takeoff weight. The distance is shortened by 12.6%, and the longitudinal pilot workload is alleviated by 9.8% and 7.3% from mean and maximum power frequency aspects. Besides, the path is less sensitive to takeoff parameter variations, such as speed, altitude and height.
College: Faculty of Science and Engineering
Start Page: 1
End Page: 18