... of fabric, illustrates pressure in the surrounding of airfoil and velocity of wind in the tunnel during different angles of attack (0°, 45° and 90°). The paper aims to discuss these issues. Design/methodology/approach The sol-gel method was applied for the synthesis of silica nano particles. So, PET...

... number ranging from 15.68856×10³ to 20.958×10³ in the water medium at 20°C ambient temperature under stable stretch conditions. Findings The results show that hydrophobic finishing reduces the drag force by 1.5 percent at the angles of attack of 0 and 90 degrees. Originality...