-cleaked.srabeo. amd drained.ho ob3t«»ucmo'« of am*

m»mo perm ttcd. af1ea compacted ah3 seeded oh ot*c«-

wn surface iheateo ron sT*», sun face dramagc.

amd comccaluemt.

<2) «afctt clearance zohe-casthwcwk amd cuear h« as spec1ficau.v hiouimd »v airdrome comnamoer. mew buildihcs or obstructohs not permitted.

Figure 131.—Cross section ot typical runway area.

parts of a plane. Since a plane lands at very high speeds, compared with vehicles, small rocks and other obstructions that would be unimportant in a road should not be allowed to remain on the runway.

c. Length of runway—The faster and heavier a plane, the longer the runway must be. Therefore landing fields for bombers, fighters, and light aircraft are of different lengths.

d. Camouflage.—If we can reach enemy installations from our fields, they can likewise rcach our fields. It is important that our fields be hard to find. and. if found, hard to see. Therefore an airfield is laid out to take advantage of natural concealment, and every attempt is made to camouflage both the airfields and the individual planes. (See figs. 134 and 135.) This is an important function of the Corps of Engineers.

e. Figures 128 and 129 illustrate a typical airfield and how ground features are used to help conceal it.

■ 81. Steel Runways.—Since construction of airfields re-NOT DRAWN TO SCALE. 126 81-82







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