Ullage Motor
Ullage motors (also known as ullage engines or ullage rockets) are relatively small, independently-fueled rocket engines that may be fired to accelerate the rocket prior to main engine ignition, when the vehicle is in a zero-g situation.
Read more about Ullage Motor: Description
Famous quotes containing the word motor:
“This biplane is the shape of human flight.
Its name might better be First Motor Kite.”
—Robert Frost (1874–1963)