Classic History Books


William J. Claxton - The Mastery of the Air

from, or alight upon, the surface of the water. Often water-planes have their floats removed and wheels
affixed to the chassis, so that they may be used over land.

From this you may think that the construction of a water-plane is quite a simple task; but such is not the
case. The fitting of floats to an aeroplane has called for great skill on the part of the constructor, and

many difficulties have had to be overcome.

Those of you who have seen an acroplane rise from the ground know that the machine runs very quickly
over the earth at a rapidly- increasing speed, until sufficient momentum is obtained for the machine to lift

itself into the air. In the case of the water-plane the pilot has to glide or "taxi" by means of a float or

floats over the waves until the machine acquires flying speed.

Now the land resistance to the rubber-tired wheels is very small when compared with the water resistance
to the floats, and the faster the craft goes the greater is the resistance. The great problem which the

constructor has had to solve is to build a machine fitted with floats which will leave the water easily,

which will preserve the lateral balance of the machine, and which will offer the minimum resistance in

the air.

A short flat-bottomed float, such as that known as the Fabre, is good at getting off from smooth water,
but is frequently damaged when the sea is rough. A long and narrow float is preferable for rough water,

as it is able to cut through the waves; but comparatively little "lift" is obtained from it.

Some designers have provided their water-planes with two floats; others advocate a single loat. The
former makes the machine more stable when at rest on the water, but a great rawback is that the two-float

machine is affected by waves more than a machine fitted with a single float; for one float may be on the

crest of a wave and the other in the dip. This is not the case with the single-float water-plane, but on the

other hand this type is less stable than the other when at rest.

Sometimes the floats become waterlogged, and so add considerably to the weight of the machine. Thus in
Mr. Hawker's flight round Britain, the pilot and his passenger had to pump about ten gallons of water out

of one of the floats before the machine could rise properly. Floats are usually made with watertight

compartments, and are composed of several thin layers of wood, riveted to a wooden framework.

There is another technical question to be considered in the fixing of the floats, namely, the fore-and-aft
balance of the machine in the air. The propeller of a water-plane has to be set higher than that of a land

aeroplane, so that it may not come into contact with the waves. This tends to tip the craft forwards, and

thus make the nose of the float dig in the water. To overcome this the float is set well forward of the

centre of gravity, and though this counteracts the thrust when the craft "taxies" along the waves, it

endangers its fore-and-aft stability when aloft.

 

CHAPTER XXXV. A Famous British Inventor of the Water-plane

Though Harry Hawker made such a brilliant and gallant attempt to win the L5000 prize, we must not
forget that great credit is due to Mr. Sopwith, who designed the water-plane, and to Mr. Green, the

inventor of the engine which made such a flight possible, and enabled the pilot to achieve a feat never

before approached in any part of the world.

The life-story of Mr. "Tommy" Sopwith is almost a romance. As a lad he was intensely interested in
mechanics, and we can imagine him constructing all manner of models, and enquiring the why and the

wherefore of every mechanical toy with which he came into contact.

 

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