9.35 A light airplane has 35-ft effective wingspan and 5.5-ft chord.

It was originally designed to use a conventional (NACA 23015)

airfoil section. With this airfoil, its cruising speed on a standard day near sea level is 150 mph. A redesign is proposed in which the current conventional airfoil section is replaced with another conventional airfoil section of the same area, but with aspect ratio AR=8. Determine the cruising speed that could be achieved with this new airfoil for the same power.