r with resultant
damage.

Struts, spars, etc., should never be left about the floor, as in such
position they are likely to become scored. I have already explained the
importance of protecting the outside fibres of the wood. Remember
also that wood becomes distorted easily. This particularly applies to
interplane struts. If there are no proper racks to stand them in, then
the best plan is to lean them up against the wall in as near a vertical
position as possible.

TIME.--Learn to know the time necessary to complete any of the various
rigging jobs. This is really important. Ignorance of this will lead
to bitter disappointments in civil life; and, where Service flying
is concerned, it will, to say the least of it, earn unpopularity with
senior officers, and fail to develop respect and good work where men are
concerned.

THE AEROPLANE SHED.--This should be kept as clean and orderly as
possible. A clean, smart shed produces briskness, energy, and pride of
work. A dirty, disorderly shed nearly always produces slackness and poor
quality of work, lost tools and mislaid material.

GLOSSARY

Aeronautics--The science of aerial navigation.

Aerofoil--A rigid structure, of large superficial area relative to its
thickness, designed to obtain, when driven through the air at an
angle inclined to the direction of motion, a reaction from the air
approximately at right angles to its surface. Always cambered when
intended to secure a reaction in one direction only. As the term
"aerofoil" is hardly ever used in practical aeronautics, I have,
throughout this book, used the term SURFACE, which, while academically
incorrect, since it does not indicate thickness, is a term usually
used to describe the cambered lifting surfaces, i.e., the "planes" or
"wings," and the stabilizers and the controlling aerofoils.

Aerodrome--The name usually applied to a ground used for the practice
of aviation. It really means "flying machine," but is never used in that
sense nowadays.

Aeroplane--A power-driven aerofoil with stabilizing and controlling
surfaces.

Acceleration--The rate of change of velocity.

Angle of Incidence--The angle at which the "neutral lift line" of a
surface attacks the air.

Angle of Incidence, Rigger's--The angle the chord of a surface makes
with a line parallel to the axis of the propeller.

Angle of Incidence, Maximum--The greatest angle of incidence at which,
for a given power, surface (including detrimen