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August, 1930 AIRCRAFT ENGINEERING 201 Th e Blackburn "Sydney" Monoplane with Three Rolls-Royce 525 h.p. F.XII.M.S. Engines H E Blackburn "Sydney," the largest military th e hull and wing and the engines are supplied by tion instruments, etc. Mounted on the bulkhead on monoplan e flying boat built in England is engine pumps through distributor control. th e port side arc a compass bracket, a mirror, and, designed to carry out the same duties as Accommodation is provided for a normal crew of in the centre a t the top, a clock. On the starboard th e well-known "Iris " type, namely Reconnais five; comprising pilot, second pilot-navigator, wire side the wireless apparatus is carried on a panel sance an d Coastal Patrol, either independently or in less operator, engineer and gunner. The bow cock agains t the bulkhead and a similar table and chair co-operation with seacraft, and is arranged to pi t is arrange d for machine gun operation, bombing, ar c fitted. Aft of the wireless station is a settee carr y a similar crew and military load. and towing and mooring operations, which are berth , the back of which hinges upwards to form an Constructed entirely of metal, with the exception carried out by the navigator. Communicating with uppe r berth; locker-space for clothes, etc., being of fabric covering on the wing and tail unit, the th e bow cockpit is th e control cabin which is com provide d below the bottom berth. On the port "Sydney " is of the high wing semi-cantilever type. pletel y enclosed. Two comfortably upholstered side arc three mahogany cupboards for canteen Th e hull, like tha t of the "Iris, " has a deep fore adjustabl e seats are mounted side b y side on a higher equipment , crockery, etc. On the front of the rear front and is well flared to keep down spray. In the level than the central gangway and dual flying and mai n frame of this compartment, on the starboard "Sydney, " however, the sides of the hull above the wate r line arc nearly perpendicular whereas those of the "Iris " slope towards the deck at a notice able angle; which makes the interior of the latter muc h more roomy. From th e second step the lines sweep upwards to the stern, in which a tail defence machine-gun station is provided behind the tail plane . Th e wing is supporte d above the hull a t the centre b y a steel tubular structure built up on the hull an d faired to form a streamline nacelle, and at the extremitie s of the centre section by two pairs of sloping struts from the hull. In appearance the wing closely resembles the wings of a gull, the centr e section having a dihedral angle, an d th e outer sections tapering to the tips in both plan and eleva tion . The wing floats are set comparatively close to th e hull and are supported by two pairs of struts from the centre section which bisect the wing bracin g struts. Th e tail plane is also a monoplane braced, simi engine controls arc fitted. The cabin is fitted with side, an engine instrument panel with radiator- larl y t o th e wing, b y two pair s of strut s from the hull sliding side windows and sliding panels in th e roof shutte r controls is mounted ; this is the engineer's an d fitted with trimming gear. No fins are fitted throug h which a good upward and rearward outlook statio n and is fitted with two seats with locker- an d the three rudders, which are unbraced extern can be obtained. space underneath. The next station aft forms the ally, incorporate servo-control which can be Dividin g the control cabin from the remaining men' s sleeping quarters and is equipped with three engaged or disengaged as required. interio r stations is a water-tight bulkhead with folding bunks, two on the port side and one on the Th e three Rolls Royce F.XII M.S. engines communicatio n through a door in the centre. starboar d side. (520 h.p. each) arc carried in nacelles faired into Behind this bulkhead on the port side is th e navi Furthe r aft, an enclosed lavatory with door is th e top of the leading edge of the wing. Each gator' s station and on the starboard side the wire provided on the port side. nacelle is fitted with a water tan k and radiator with less station . The navigato r is provided with a chart Behind this is a cooking stove with ice-chest shutter s and an oil tank and cooler. The main tabl e and revolving chair, and stowage for naviga beneat h and on the starboard side are fresh water petro l tank s are carried in th e faired portion between an d paraffin storage tanks. At the rear of this compartmen t is th e rear machine-gun cockpit, below which is the gunner's platform; this platform has a hinged top which gives access to locker space beneath . A separate portion of this platform also hinges upwards on the starboard side to allow com municatio n with the after part of the hull and tail- defence station. Whil e complete data regarding the "Sydney" ma y not be given, it ma y be state d tha t fully loaded its gross weight is nearly 10 tons . Its military load is very similar to that of the "Iris " and in size it closely resembles the "Nile " commercial flying boa t which was laid down at the same time as the "Sydney, " but has been delayed owing to the urgency of the military machine. In respect of performance the "Sydney " is expected to be faster tha n both the "Iris " and "Nile," and to have a to p speed of over 120 miles per hour. The National Physical Laboratory Th e annual "Inspection by the General Board," In the large "Duplex " tunnel was shown a stage undesirabl e eddies, th e effects of which it is hoped to whic h is made the occasion for a reception of a in the investigations that are being made into the get over by enclosing the balance supports. In numbe r of guests, t o whom an opportunity is given orde r to overcome the difficulty of measuring forces question of interference between different parts of of seeing some of the work being done, was held at in a tunnel working at 25 atmospheres, which a n aeroplane, with particular reference to the best th e National Physical Laboratory, Teddington, on manifestly have considerable magnitude, an entirely location of an engine nacelle in a monoplane wing; Jun o 27. It was of interes t to find tha t the N.P.L . is new typo of balance has been evolved with crossed anothe r aspect of the same inquir y being demonstra turnin g its attentio n t o th e open jet typ e of tunnel - sprin g supports in place of the usual knife edges. ted in 7 ft. wind tunnel No. 3. Mr. lrving's con such as has been in use in America and a t Göttingen Th e balance, which indicates electrically, will at a tinue d work on spinning was to be seen No. in 2 and elsewhere for some years—having hitherto been full working load of 750 lb. definitely detect a force tunnel , wher e the effect of sweep-back as a complete exclusively equipped with wind tunnels of the en eliminato r of auto-rotation was explained. One of of one-thousandth of a pound at a leverage of one closed type. A one-eighth scale model, built for th e most interesting demonstrations was tha t given foot—as was demonstrated on a mock-up of the experimenta l purposes, of an open-jet tunnel was on b y Mr. L. F . G. Simmons on the possibilities of the system . A description of this balance was pub view, while the compressed air-tunnel that is under dense smoke emitted by titanium tetrachloride in lished in the N.P.L. Annual Report for the construction , of which a model was shown, is also makin g visible streamline flow. If the technique yea r 1929, pp . 226-228, and of the electromagnetic of this type. The latte r model has, it is understood, of photographing this can be successfully developed indicato r in the report for the year 1928 at given indications that the open jet may produce page 228. i t should be of great interest.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Aug 1, 1930
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