Book-bot.com - read famous books online for free

Aeroplanes by James Slough Zerbe
page 92 of 239 (38%)
illustrated by assuming that we have a line running
from A to Z, which indicates the range of
speeds in aeroplanes. The limits of speeds are
fairly stated as being within thirty and eighty-
five miles per hour. Less than thirty miles are
impossible with any type of plane, and while some
have made higher speeds than eighty-five miles it
may be safe to assume that such flights took place
under conditions where the wind contributed to
the movement.

_Fig. 32. Chart showing Range of Uses_

COMMERCIAL UTILITY.--Before machines can be
used successfully they must be able to attain
slower speeds. Alighting is the danger factor.
Speed machines are dangerous, not in flight or
at high speeds, but when attempting to land. A
large plane surface is incompatible with speed,
which is another illustration that at high velocities
supporting surfaces are not necessary.

Commercial uses require safety as the first element,
and reliability as the next essential. For
passenger service there must be an assurance that
it will not overturn, or that in landing danger is
not ever-present. For the carrying of freight interrupted
service will militate against it.

How few are the attempts to solve the problem
DigitalOcean Referral Badge