WIG craft

WIG craft

[′wig ¦kraft]
(aerospace engineering)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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WIG craft gives an alternate solution to gain higher speed [1].
They suggested that for acceptable stability of a WIG craft, the centre of gravity should be close to the height of aerodynamic center ([X.sub.h]), and it should be between the height of aerodynamic center and pitch aerodynamic center ([X.sub.[alpha]]).
In a stable WIG craft, these derivatives usually are [CL.sub.z] > 0, [CM.sub.[alpha]] < 0, [CL.sub.[alpha]] > 0, and [CM.sub.z] > 0 [15].
It can be seen from the literature review that improving the aerodynamic characteristics of the wing in proximity to the ground by different means, such as the endplates, different configuration of wing is one of the important parameters in designing a WIG craft. The improvement of wing can increase the range and endurance of flight and decrease the fuel consumption and C[O.sub.2] emission.
In this research work, the aerodynamic characteristics and static stability of the WIG craft with the compound wing configuration [14] developed at UTM was experimentally investigated with and without endplates.
The aerodynamic characteristics, specifically the ground effect, of the WIG craft with a compound wing were investigated in a low speed wind tunnel at the Universiti Teknologi Malaysia (UTM-LST).
The experiments were carried out on a WIG craft model that used a new compound wing configuration [16] as shown in Figures 2 and 3.
The WIG craft model was mounted on the test section of the wind tunnel with a strut as shown in Figure 5.
The frontal area ratio of the WIG craft model and the test section was small; therefore, the blockage ratio for the wings related to side and roof walls of the wind tunnel can be neglected.
The WIG craft model aerodynamic coefficients and centre of pressure were obtained in this study using the following formulas:
The lift coefficients of the WIG craft model with and without endplates are shown in Figure 6.
Figure 7 depicts the drag coefficient ([C.sub.D]) of the WIG craft model with and without endplates.