inside with galvanized onto the balance. sheet metal as a protection against &e. Exit cone.—^Forward of the propellers and located Entrance cone.—^The entrance cone is 75 feet in on the center line of the tunnel is,a smooth fairing length and in this distance the cross section changes which… … FiGDBE 2.—Eiterior view of tho tunnel. From the propellers aft, the exit cone is divided into cone is sMghtly less than 5:1. The shape of the two passages and each transforms in the length of 132 entrance cone was chosen to give as far as possible a constant acceleration to the air stream and to…
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