WIND TUNNEL TESTS AND FURTHER ANALYSIS OF THE FLOATING WING FUEL TANKS FOR HELICOPTER RANGE EXTENSION. VOLUME 5. ANALYSIS OF STABILITY, CONTROL AND PERFORMANCE CHARACTERISTICS

Experimental aerodynamic investigations remain the subject of interest in rotorcraft community since the flow around the helicopter is dominated by complex aerodynamics and flow interaction phenomena. The objective of this study is to determine the aerodynamic drag characteristics of helicopter horizontal tail by conducting wind tunnel tests. To fulfil the objective, three of the most common helicopter horizontal tail configurations namely Forward Stabilizer, Low-aft Stabilizer and T-tail Stabilizer, were fabricated as a simplified scaled-down wind tunnel model mated with a standard ellipsoidal fuselage. The test wind speed for this experimental work was 30 m/s, determined from Reynolds sweep, which was corresponding to Reynolds number of 2.8 x 105. Wind tunnel tests were performed at variations angle of attack ranging from -15O to 15O with 5O interval. The results tell that at zero yaw and zero pitch angles, Forward Stabilizer contributed the least drag coefficient at 0.277 implying the configuration could be the best for cruising flight segment. Contrarily to T-tail Stabilizer, this configuration contributed the most drag coefficient at 0.303, which was 9% higher than the former. The T-tail Stabilizer was also found to be the most sensitive to the change of angle of attack where the drag was drastically increased up to 131.35% at -15O angle of attack compares to at zero angle of attack. These findings had successfully testified that the type of stabilizer configuration does significantly influencing the aerodynamic drag characteristics of helicopter. Subsequently, the selection of stabilizer must wisely be done to have the best aerodynamic efficiency and performance for the helicopter.

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EFFECT OF COMBUSTION DURATION ON THE OPERATING AND PERFORMANCE CHARACTERISTICS OF A HYDROGEN-ETHANOL DUAL FUELED ENGINE: AN EXPERIMENTAL ANALYSIS

International Journal of Advances on Automotive and Technology ◽

10.15659/ijaat.16.07.323 ◽

2016 ◽

Author(s):

Syed Yousufuddin

Keyword(s):

Experimental Analysis ◽

Performance Characteristics ◽

Combustion Duration ◽

And Performance

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An Analytical Transient Tire Model

Tire Science and Technology ◽

10.2346/1.2135231 ◽

2001 ◽

Vol 29 (2) ◽

pp. 108-132 ◽

Cited By ~ 1

Author(s):

A. Ghazi Zadeh ◽

A. Fahim

Keyword(s):

Transient Behavior ◽

Stability Control ◽

Vehicle Stability ◽

Tire Model ◽

Steering Angle ◽

First Order ◽

Vehicle Stability Control ◽

Proposed Model ◽

Depth Study ◽

And Performance

Abstract The dynamics of a vehicle's tires is a major contributor to the vehicle stability, control, and performance. A better understanding of the handling performance and lateral stability of the vehicle can be achieved by an in-depth study of the transient behavior of the tire. In this article, the transient response of the tire to a steering angle input is examined and an analytical second order tire model is proposed. This model provides a means for a better understanding of the transient behavior of the tire. The proposed model is also applied to a vehicle model and its performance is compared with a first order tire model.

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