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aeroplanes-第28章

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when moved a certain way will move a plane a

definite direction。 He should learn to know

instinctively; how FAR a movement to make to get

a certain result in the plane itself; and under running

conditions; as well。



Suppose we have an automobile; running at the

rate of ten miles an hour; and the chauffeur turns

the steering wheel ten degrees。 He can do so with

perfect safety; but let the machine be going forty

miles an hour; and turn the wheel ten degrees;

and it may mean an accident。 In one case the

machine is moving 14 1/2 feet a second; and in the

other instance 58 feet。



If the airship has a lever for controlling the

angle of flight; he must study its arrangement;

and note how far it must be moved to assume

the proper elevating angle。 Then come the means

for controlling the lateral stability of the machine。

All these features should be considered and studied

over and over; until you have made them your

friends。



While thus engaged; you are perfectly sure that

you can remember and act on a set of complicated

movements。 You imagine that you are skimming

over the ground; and your sense tells you that you

have sufficient speed to effect a launching。 In

your mind the critical time has come。



ELEVATING THE MACHINE。Simply give the elevator

lever the proper angle; sharp and quick and

up you go。 As the machine responds; and you can

feel the cushioning motion; which follows; as it begins

to ride the air; you are aware of a sensation

as though the machine were about to turn over

to one side; you think of the lateral control at

once; but in doing so forget that the elevator must

be changed; or you will go too high。



You forget about the earth; you are too busy

thinking about several things which seem to need

your attention。 Yes; there are a variety of matters

which will crowd upon you; each of which require

two things; the first being to get the proper

lever; and the second; to move it just so far。



In the early days of aeroplaning; when accidents

came thick and fast; the most usual explanation

which came from the pilot; when he recovered;

was: 〃I pushed the lever too far。〃



Hundreds of trial machines were built; when

man learned that he could fly; and in every instance;

it is safe to say; the experimenter made the

most strenuous exertion to get up in the air the

first time the machine was put on the trial ground。



It is a wonder that accidents were not recorded

by the hundreds; instead of by the comparatively

few that were heard from。 It was very discouraging;

no doubt; that the machines would not fly;

but that all of them; if they had sufficient power;

would fly; there can be no doubt。



HOW TO PRACTICE。Absolute familiarity with

every part of the machine and conditions is the

first thing。 The machine is brought out; and the

engine tested; the machine being held in leash

while this is done。 It is then throttled down so

that the power of the engine will be less than is

necessary to raise the machine from the ground。



THE FIRST STAGE。Usually it will require over

25 miles an hour to raise the machine。 The engine

is set in motion; and now; for the first time a new

sensation takes possession of you; for the reason

that you are cut off from communication with

those around you as absolutely as though they

were a hundred miles away。



This new dependence on yourself is; in itself;

one of the best teachers you could have; because

it begins to instill confidence and control。 As the

machine darts forward; going ten or fifteen miles

an hour; with the din of the engine behind you;

and feeling the rumbling motion of the wheels

over the uneven surface of the earth; you have the

sensation of going forty miles an hour。



The newness of the first sensation; which is

always under those conditions very much augmented

in the mind; wears away as the machine

goes back and forth。 There is only one control

that requires your care; namely; to keep it on a

straight course。 This is easy work; but you are

learning to make your control a reflex action;to

do it without exercising a distinct will power。



PATIENCE THE MOST DIFFICULT THING。If you

have the patience; as you should; to continue this

running practice; until you absolutely eliminate

the right and left control; as a matter of thought;

occasionally; if the air is still turning the machine;

and eventually; bringing it back; by turning

it completely around; while skimming the ground;

you will be ready for the second stage in the

trials。



THE SECOND STAGE。The engine is now arranged

so that it will barely lift; when running

at its best。 After the engine is at full speed; and

you are sure the machine is going fast enough;

the elevator control is turned to point the machine

in the air。 It is a tense moment。 You are on the

alert。



The elevator is turned; and the forward end

changes its relation with the ground before you。

There was a slight lift; but your caution induces

you to return the planes to their normal running

angle。 You try it again。 You are now certain

that the machine made a leap and left the ground。

This is the exhilarating moment。



With a calm air the machine is turned while

running; by means of the vertical rudders。 This

is an easy matter; because while going at twenty

miles an hour; the weight of the machine on the

surface of the ground is less than one…tenth of its

weight when at rest。



Thus the trial spins; half the time in the air;

in little glides of fifty to a hundred feet; increasing

in length; give practice; practice; PRACTICE;

each turn of the field making the sport less exciting

and fixing the controls more perfectly in the

mind。



THE THIRD STAGE。Thus far you have been

turning on the ground。 You want to turn in the

air。 Only the tail control was required while on

the ground。 Now two things are required after

you leave the ground in trying to make a turn:

namely; putting the tail at the proper angle; and

taking charge of the stabilizers; because in making

the turn in the air; the first thing which will

arrest the attention will be the tendency of the

machine to turn over in the direction that you are

turning。



After going back and forth in straight…away

glides; until you have perfect confidence and full

control; comes the period when the turns should

be practiced on。 These should be long; and tried

only on that portion of the field where you have

plenty of room。



OBSERVATIONS WHILE IN FLIGHT。If there are

any bad spots; or trees; or dangerous places; they

should be spotted out; and mentally noted before

attempting to make any flight。 When in the air

during these trials you will have enough to occupy

your mind without looking out for the hazardous

regions at the same time。



Make the first turns in a still air。 If you should

attempt to make the first attempts with a wind

blowing you will find a compou
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