International Journal of Advanced and Applied Sciences

Int. j. adv. appl. sci.

EISSN: 2313-3724

Print ISSN:2313-626X

Volume 3, Issue 9  (September 2016), Pages:  16-24

Title: Modeling of parasitic effects in multi-rotor hybrid aircrafts (Part-II)

Author(s):  Ali Shahbaz Haider *, Ahsan Fayyaz, Fatima Ayoub, Samman Jabbar, Asfandyar Ghani 


Department of Electrical Engineering, COMSATS Institute of IT, Wah, Pakistan

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This article presents the detailed modeling and analysis of some of the parasitic effects that slink into the dynamics of multi-rotor hybrid aircrafts during transient and steady state flight conditions. The “parasitic” effects are undesirable effects such as coriolis, centripetal and centrifugal accelerations; gyroscopic and precession moments, rotor tilt reaction moment, inertial counter torques, frictional moments, air drag moments etc. These effects are the primary cause of the nonlinearity and coupling in the dynamics of aircrafts. A hybrid aircraft in Tee configuration, with three rotors, has been considered. It has a tilt-rotor and the tilt-wing mechanism to perform maneuvers. The parasitic air dag moments, tilt reaction moment, angular acceleration effects, reaction moments and the frictional moments have been modeled in detail for this aircraft. This work supplements the study in part-I of this research project. The analysis is performed in a way that it could easily be extended to a multi-rotor hybrid craft with different number of rotors and in any given structural configuration. 

© 2016 The Authors. Published by IASE.

This is an open access article under the CC BY-NC-ND license (

Keywords: Parasitic effects, Hybrid aircraft, T-Copter, Air drag, Tilt reaction, Coriolis acceleration, Reaction moments, Frictional moments

Article History: Received 15 June 2016, Received in revised form 10 August 2016, Accepted 17 September 2016

Digital Object Identifier:


Haider AS, Fayyaz A, Ayoub F, Jabbar S, and Ghani  A (2016). Modeling of parasitic effects in multi-rotor hybrid aircrafts (Part-II). International Journal of Advanced and Applied Sciences, 3(9): 16-24


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