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Aviation History
1909
1909 - 0221.PDF
APRIL 17, 1909. Clarkson.—Biplane without rudder or elevator but '•having righting tips on the upper main planes and righting tips to the rigid rear tail. The planes are well cambered, and neatly double-surfaced with glazed cotton. Cremona.—Biplane fitted with twin propellers en- closed in tubes between the planes. Each tube carries a rudder behind and an elevator in front. Dalton, Major.—Double monoplane fitted with sur- faces which are very nearly as Ions; as they are wide. The rear plane is arched on top and flat beneath. Deep keels are fitted beneath each plane and the frame is mounted on floats. De Brandt.—Helicopter aeroplane, also fitted with a propeller. The aeroplane surface is flat and circular in shape, the lifting screw being in the centre. Deixler.—Monoplane of bat's wing shape constructed aft frames supporting narrow transverse planes, all of which are arched convex to the ground. At each corner the frames carry hinged triangular planes. Hatfield.—Biplane with arched surfaces concave to each other. The tail is similarly arranged. Hollidge.—Biplane illustrating the use of a ski for its support when on the ground. The planes are double surfaced, and stayed internally with diagonal wires. Howard.—Double dihedral monoplane, each plane being fitted with a triangular keel and the whole mounted on a simple longitudinal frame. Kay.—Collective display of working model dihedral double monoplanes. The construction is mainly remark- able for its simplicity and strength. The planes are cambered, but the front and rear edges are on the same level, being attached to fore and aft spars running the full length of the model. • •'"•'• •-"-_• • ~ " • •• • •• plight" Copyright Photo. . MODELS AT OLYMPIA. 1. Pointer. 2. Hatfield. 3. Pointer. 4. Francis. 5. Powell. 6. Maxfield. 7. Lambert and Bowden. of steel wire and having a large monoplane elevator mounted on an outrigger framework in front of the main wings. Twin screws are placed between the elevator and the main wings Donovan.—Helicopter aeroplane fitted with twin lifting screws and a circular aeroplane surface. Foster.—Biplane with supplementary righting planes between the main planes. The upper main plane is sharply arched in the centre. Francis.—Biplane with stern rudder and elevator. Its construction is also interesting as an example of the use of umbrella wire for the framework and glazed calico for the surface. Halliday.—Model illustrating two superposed fore and Lambert and Bowden.—Biplane with arched planes supported by tubular brass struts. The elevator and rudder are carried close together on an outrigger frame- work behind. Hinged righting tips are fitted between the main planes. Letourneur.—Monoplane with wings rigidly attached to a large longitudinal box girder, which is itself pro- vided with supporting surfaces at intervals. The machine is driven by a clockwork tractor-screw in front, and the idea is apparently to utilise the box girder as a channel to receive the draught from the propellers. Hinged triangular wings are fitted to give lateral stability, and rudders are placed above and below a fan-shaped triplane tail at the rear. 223
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