the turn. To minimize such action the
pilot banks, i.e., tilts, the aeroplane sideways in order to oppose the
underside of the planes to the air. The aeroplane will not then skid
outwards beyond the slight skid necessary to secure a sufficient
pressure of air to balance the centrifugal force.

[7] An explanation of the way in which the wash-out is combined with a
wash-in to offset propellor torque will be found on p. 82.

[8] A.M.'s: Air Mechanics.

[9] Butt means to thicken at the end. Screw means to machine a
thread on the butt-end of the wire, and in this way the wire can make
connection with the desired place by being screwed into a metal fitting,
thus eliminating the disadvantage of the unsatisfactory loop.

[10] Deviation curve: A curved line indicating any errors in the
compass.

[11] A propeller screws through the air, and the distance it advances
during one revolution, supposing the air to be solid, is known as the
pitch. The pitch, which depends upon the angle of the propeller blades,
must be equal to the speed of the aeroplane, plus the slip, and if, on
account of the rarity of the air the speed of the aeroplane increases,
then the angle and pitch should be correspondingly increased. Propellers
with a pitch capable of being varied by the pilot are the dream of
propeller designers. For explanation of "slip" see Chapter IV. on
propellers.

[12] Getting out of my depth? Invading the realms of fancy? Well,
perhaps so, but at any rate it is possible that extraordinary speed
through space may be secured if means are found to maintain the impulse
of the engine and the thrust-drift efficiency of the propeller at great
altitude.

[13] Box-kite. The first crude form of biplane.

[14] See Newton's laws in the Glossary at the end of the book.

[15] See "Aerofoil" in the Glossary.

[16] "In effect" because, although there may be actually the greatest
proportion of keel-surface In front of the vertical axis, such surface
may be much nearer to the axis than is the keel-surface towards the
tail. The latter may then be actually less than the surface in front,
but, being farther from the axis, it has a greater leverage, and
consequently is greater in effect than the surface in front.

End of the Project Gutenberg EBook of The Aeroplane Speaks, by H. Barber

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