K
Keel—A vertical plane or planes arranged longitudinally either above or below the body for the purpose of giving stability.
L
Lateral Stability—Stability which prevents side motion.
Loading—The gross weight divided by the supporting area measured in square feet.
Longitudinal Stability—Stability which prevents fore and aft motion or pitching.
Longerons—Main members of the fuselage. Sometimes called longitudinals.
M
Mast—A perpendicular stick holding the stays or struts which keep the wings rigid.
Model Aëroplane—A scale reproduction of a man-carrying machine.