อ.เติ้ล หมอดูเศรษฐี | เตรียมจดหวย"อาจารย์เติ้ล" 1/มิ.ย./2562
When flying a high-performance sleek aircraft often it is problematic getting the aircraft slowed down. Many super high performance aircraft and gliders have spoilers or speed brakes to help slow them down for landing by increasing drag.
from: http://ezinearticles.com/?Aircraft-Lighting-System-Fuel-Saver&id=78164
