Man's physical universe

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AIRPLANE A TRIUMPH OF MODERN SCIENCE 361

Experimental airplanes have demonstrated that the wings and

fuselage may be molded in large quantities at low cost from plastics

laminated with plywood. The strength for a given weight of such

plastic materials exceeds by ten times that of stainless steel in local

buckling, but not in tensile strength.

Fig. 154. Plastic-plywood plane. (Courtes> of the Langley Aviation

Corporation.)

The surface of such planes may be made very smooth, thus reducing

skin friction. Plastic surfaces are resistant to weather, impervious to

water, reasonably fireproof, and corrosion-proof.

Plastics enter modern aircraft in many minor ways, such as in their

use for instrument cases. Windows are sometimes made of acrylic

resin sheets.

Neoprene Gasoline Tanks Have Many Advantages.

Neoprene-rubber gasoline tanks, called Mareng cells,

have the following

advantages:

1. They eliminate corrosion.

2. They are not affected by vibration or the surging of the gasoline in

them.

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