The 3 axes that cross at the cen-ter of your vehicle's gravity are longitudinal, lateral and vertical. The cen-ter of gra-vity of a vehicle is that po-int. aro-und which all weight is evenly bal-anced.
These three axes, refer-red to as longitudinal, late-ral and vertical, are each perpendicular to the others and inter-sect at the air-craft centre of gra-vity.
Motion aro-und the longit-udinal axis, the lateral axis and the vert-ical axis are refer-red to as roll, pitch and yaw respect-ively. The primary fli-ght control surface for the control-ling roll is the ailerons, for pitch the ele-vator and for yaw, the rud-der.
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