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Aviation History
1926
1926 - 0370.PDF
JUNE 3, 1926 ANOTHER INTERESTING A.D.C. MODIFICATION The " Nimbus-Martinsyde " RECENTLY yet another has been added to the list of machines modified by A.D.C. Aircraft, Ltd., so as to bring them up to date. This time, as before, Mr. John Kenworthy, the firm's chief designer, has chosen as his basis, so to speak, the good old Martinsyde F.4 (it will be recollected that some years ago A.D.C. Aircraft, Ltd., took over the goodwill of the Martinsyde firm), and has designed for it a new " nose " to take the A.D.C. " Nimbus " engine recently developed and re-designed by Major Halford from the original Siddeley " Puma," and which has now passed the British Air Ministry's type tests. The resulting combination is highly pleasing to the eye, as will be seen from the photographs of the machine on the known as the " Nimbus-Martinsyde," and on a recent visit to Waddon, when we had an opportunity of watching it in flight, the new machine certainly gave an extremely favourable impression. At the moment we are not permitted to give a detailed description of the " Nimbus-Martinsyde." This must be reserved for a future occasion, but the accompanying illus- trations should speak for themselves, although they cannot, of course, give any indication of the speed and climb of the machine. It is believed that there is a very strong probability of the " Nimbus-Martinsyde " taking part in the King's Cup A BROADSIDE [" FLIGHT " Photograph Mr. H. H. Perry flying the A.D.C. " Nimbus-Martinsyde " at Croydon aerodrome. The neat engine cowling is well illustrated in this view. See also pp. 315 and 317.) ground and in the air which appear on pp. 315 and 317. Mr. Kenworthy has designed a remarkably " clean " engine housing and cowling, and with the retractable radiator Under the fuselage, the air flow round the nose promises to be particularly undisturbed. Preliminary test flights seem to indicate that this desirable state has been attained, as the machine certainly gives the impression of being extremely fast, and with an excellent climb. Performance figures are not yet available, as the machine has but recently been finished and there has been no opportunity for thorough tests, but Mr. H. H. Perry, the firm's chief test pilot, reports very favourably on the machine, which, incidentally, is to be race, and as all aeroplanes taking part in this race are to be handicapped according to the new Royal Aero Club formula (based upon wing loading and power loading only), there should then be an excellent opportunity of determining whether or not the " clean " lines of the machine make a marked difference to the speed. Personally, we believe it will be found that this new machine will do well in the race, but this time alone can show. Incidentally, the " Nimbus" engine will also then have its first opportunity of taking part in a great race, so that from all points of view the behaviour of the " Nimbus-Martinsyde " in the race will be watched with interest. 316
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