Primary sails are those that supply the chief propelling force in ordinary weather; secondary sails are those that aid the primary sails either by helping to balance the ship or by providing additional driving power.
The caudal fin is moving normal to free-stream velocity, V o, with a transverse (sway) velocity equal to V N. It is possible for caudal fin to attain a thrust component which provides a forward propelling force.
The basal part of the wing supplies most of the supporting surface, the wing tip most of the propelling force.
MULTICULTURALISM, more than an attitude but less than a theory, was a propelling force behind American art of the last two decades.
Shariatmadari said, "Carter's human-rights policy has not been a very important propelling force, though it has not been totally without effect in pushing liberalization.
In recent years, poor run defense in the trenches has often been the propelling force behind Buffalo's schematic flip-flopping.
It was a Connecticut story and an appealing topic, the propelling force which led to further research and the curator David Herlihy, a renowned bicycle historian".
In fast movements, when the propelling force is not such motivic interplay, it is likely to be a force achieved by outright statements of musical figures based on chords and scales.
Proactive spirituality is also the propelling force beneath 'HAJJ: JOURNEY TO THE HEART OF ISLAM' (Harvard University Press, $39.95), this one derived from an exhibition of the same title seen at the British Museum this year.
But nobody knows a vehicle the way an owner does, and the players dedicated to this rusty, still powerful form understand its problems as well as its propelling force.
As used in World War II and later wars it consisted basically of one or more fuel tanks, a cylinder of compressed gas to supply the propelling force, a flexible hose connected to the tanks, and a trigger-nozzle equipped with some means of igniting the fuel as it was spewed forth.
