In this study, the aerodynamic performance of seven different airfoils named CLARK Y, YH, Curtis C-72, FX 66-S-196 V1, NACA4412, NACA4415, and NACA4418 was numerically investigated under angles attack ranging from 0° to 30° in increments 5°. 2D (two-dimensional) CFD (Computational Fluid Dynamics) models were created performed steady-state conditions. When changes lift coefficient drag with exam...

writing has always been considered an important literacy skill for foreign/second language learners. the internet provides such unique applications for the writing skill as weblogs, wikis, and social networking websites. up to now researchers have put their focus on the learners’ performances in the traditional paper and pencil environment or wikis and blogs it is time to also consider learners...