Multiplane--An aeroplane of which the main lifting surface consists
of numerous surfaces or pairs of wings mounted one above the
other.
Montant--Fuselage strut.
Nacelle--That part of an aeroplane containing the engine and
pilot and passenger, and to which the tail plane is not fixed.
Neutral Lift Line--A line taken through a surface in a forward direction
relative to its direction of motion, and starting from its
trailing edge. If the attitude of the surface is such as to make
the said line coincident with the direction of motion, it results
in no lift, the reaction then consisting solely of drift. The position
of the neutral lift line, i.e., the angle it makes with the chord,
varies with differences of camber, and it is found by means of
wind-tunnel research.
Newton's Laws of Motion--1. If a body be at rest, it will remain at
rest; or, if in motion, it will move uniformly in a straight line
until acted upon by some force.
2. The rate of change of the quantity of motion (momentum) is
proportional to the force which causes it, and takes place in the
direction of the straight line in which the force acts. If a body
be acted upon by several forces, it will obey each as though the
others did not exist, and this whether the body be at rest or in
motion.
3. To every action there is opposed an equal and opposite
reaction.
Ornithopter (or Orthopter)--A flapping wing design of aircraft intended
to imitate the flight of a bird.
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