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Aviation History
1951
1951 - 1222.PDF
29 June 1951 755 FROM ALL QUARTERS Soviet Aircraft Active TN Germany, Russian aircraft have again been busy exercising * in the Brandenburg-Dallgow-Elsgrund area. Early on the morning of June 15th, for instance, three of the new twin-jet bombers were observed, escorted by six Mig-15 fighters. There- after every hour came formations of jet bombers from various directions, and at all heights. A correspondent claims to have identified three variants of the bomber : (1) the standard machine, as illustrated in Flight of May 25th; (2) a version without trans- parent nose and with no radome; (3) similar to (2) but with radome. In Korea, Yak-9 fighter-bombers and 11-2 ground-attack aircraft have been active, in addition to Mig-i5s. L. G. Frise to Develop Percival Helicopters A HELICOPTER-DESIGN division of Percival Aircraft, Ltd., **• is shortly to be created. This news is contained in an announcement that Mr. L. G. Frise, B.Sc, F.R.Ae.S., A.F.I.Ae.S. —under whose control it will come —has been appointed technical director of the company. Leslie rrise has been chief engineer and lief idesigner for nearly three yearsAPjeviously, and from soon • tf^nrst world war, when he in the R.N.A.S., he was e Bristol Aeroplane Com- for whom he designed 'famous types. The 1930 Bulldog, which became the stand- ard fighter of the R.A.F., was his, as was the Britain First (1934), which was developed into the famous Blenheim; detail design of the hydraulics, re- tractable undercarriage and flap ,gear were all from his drawing- board. Other history-making Bristol types to his credit in- Air. L. G. Frise eluded the Beaufort, Beaufighter, Bombay, Freighter and Brigand, and he was responsible for the original conception of the Brabazon design. His many patents include the Frise aileron (for which he was awarded a Wakefield Gold Medal by the R.Ae.S.) and the all- electric cannon turret. On joining the Percival concern, he continued the development of the Prince into its present versatile status, and he has also played an important part in the success of the P.56 (now named the Provost) which recently won the competition for a new R.A.F. basic trainer. O rend a Details AS recorded on page 756, the Avro Canada CF-100 long-range,- all-weather fighter, powered by two Avro Canada Orenda turbojets, has made its first flight. Of particular interest, there- forej are the new details of the Orenda made known by Mr. Douglas Knowles, chief development engineer of Avro Canada's gas turbine division, when he addressed the American Society of Mechanical Engineers in Toronto recently. During the 4J years of development behind the Orenda, the engine has undergone 5,000 hr of bench-testing and 150 hr of flying. Designed primarily to power the CF-100, it delivers a rated thrust in excess of 6,000 lb and its fuel consumption is about 1.0 lb/hr/lb thrust—both figures under sea level static conditions. The dry weight is about 2,500 lb, nominal diameter 42m, and length about 10ft. There are six combustion chambers and a single-stage turbine. Mr. Knowles singled out for special mention the flexible rubber thrust ring which allows some degree of angular mis- alignment of the centre bearing, to cater for deflections of the engine structure during aerobatics. The compressor rotor, he said, is of combined disc and drum construction. Dart's 500-hour Test THE 1,500-h.p. production-type Rolls-Royce Dart turboprop,as developed for the Vickers Viscountj has successfully com- pleted a remarkable 500-hr endurance test at Derby. The schedule, which was compiled with the assistance of B.E.A., reproduced— as far as is possible on the ground—the conditions likely to be encountered by Viscounts in routine service on European routes. For instance, one portion of the test simulated requirements dur- ing the Rome-London stage of a return flight from Athens. The sequence for this part of the test was as follows : taxi-out: 6 min, 6,000 r.p.m.; take-off: 1 min, 14,500 r.p.m.; climb: 42 min, 13,300 r.p.m.; cruise, 2 hr 11 min, 13,300 r.p.m.; descent: 25 min, 10,000 r.p.m.; approach and landing, 5 min, 10,750 r.p.m.; taxi-in : 6 min, 6,000 r.p.m. The rotational speeds used were those recommended by Rolls- Royce for commercial flying. Since the test was made at sea level, this resulted in much higher powers being developed than would be the case at altitude, so that the conditions were much more arduous than would normally be imposed. 3 INTO I =88 : Classified as »experimental;'_and powered by a MH-RoyceNene ^oj^e^^Hofficianyst^ ^™^j^$$£ will be judged on June 21 st. and constructed by Handley Page, Ltd., and Blackburn and General Aircraft, Ltd The discerning reader however w,ll detect evidence o Submarine finger in this most intriguing aerodynamic pie. An "experimental HandkyPage wing is stated to be embodied, and a w from the photograph that this is of double-cranked plan form. The first flight was made by Mr. G. R. /. Parker, D.F.C., A.F.C., D.S.M., oi
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