A FLYING BOAT FOR SUBMARINES: The U.S. Navy Department has recently accepted a small flying boat specially designed to be carried in submarines. This machine, shown here, built by Grover Loening, of New York, is a single-seater monoplane fitted with a 100-h.p. engine driving a pusher airscrew. The engine is mounted on hinged struts so as to fold back on to the hull, while the wings also fold back. The whole machine can thus be stowed in a comparatively small "tube" in the parent submarine.

THE AMERICAN COUNTERPART: The full-scale wind tunnel at Langley Laboratory gives an air stream 60 ft. wide by 30 ft. high. One of the 35-ft. diameter four-bladed airscrews can be seen. It is driven by an electric motor of 4,000 h.p. The aircraft is supported on a six-component balance.

FULL SCALE RESEARCH: This photograph of the new large wind tunnel at Langley Field, Virginia, has been very kindly lent to us by Mr. John J. Ide, Technical Assistant in Europe of the American N.A.C.A. The tunnel is of the open type, and the aeroplane is supported on a six-component balance by means of struts in the centre of an airstream 60 ft. wide and 30 ft. high. The four-bladed propellers which circulate the air are of 35 1/2 ft. diameter, and each is driven by an electric motor of 4,000 h.p. the high figure of 112 m.p.h. The machine under test is a Loening flying boat.

A FAST AMPHIBIAN: This is the latest machine, designed by Grover Loening. It is claimed to be the fastest amphibian in the world, but trailing edge flaps also provide low landing speed.