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Aviation History
1947
1947 - 0648.PDF
FLIGHT APRIL 24TH, 1947 CORRESPONDENCE tii;- addition oi small quantities of potassium cuprocyanide which aits as a catalyst, spontaneous combustion occurs. The burning gases pass into the combustion chamber and then expand through a venturi exit to the outside air. INLET-' C STOFF CSTOFFDELIVERY \ C.STOFF CIRCULATING i DISTRIBUTOR AROUND COMBUSTION ' CO/iTROL VALVE / CHAMBER STEAMTURBtNt ASSEMBLY PUMP T. STOFF^ , DELIVERY \ STEAM SECONDARY GENERATOR CONTROL VALVt EXIT DOUBLE-WALLEDCOMBUSTION CHAMBER COMBUSTIONHEAD Part of the T. Stoff pump delivery is passed via the inter- connected secondary control valve to the steam generator. Mere it passes over a catalyst consisting of porous stones im- pregnated with calcium permanganate and potassium chromate and is converted into steam. The steam is led to the nozzle of sthe steam turbine, driving the turbine wheel and thus thedelivery pumps. Should the turbine wheel rotational speed become excessive the delivery pressure from the C. Stoff pump is led to a rubber diaphragm and acts on this against the pressure of a spring. This depresses a valve in the secondary control valve unit so restricting the supply of T. Stoff being used to generate steam. As the steam supply diminishes, so does the rotational speed of the turbine wheel diminish and the pumps' delivery with it. The valve in the secondary control valve unit then returns to normal. When the main distributor control valve is closed it is the T. Stoff pressure which moves (his controlling valve in the opposite direction once more lestricting the steam generated and slowing down the turbine and pumps. A pressure lead is also taken from the main distributor control valve to the rubber diaphragm to provide adequate control of pump speed. The main difference betwen the Walter H.W.K. 109-509 A.I and the 109-509 C. is in the starting mechanism. The A.i rocket engine utilizes an electric starter motor for initial turning of the turbine wheel and pumps. The "C" rocket engine utilizes a T. Stoff starter with ejector valves which exhaust the air from the pumps. There is a secondary com- bustion chamber for cruising conditions. Empire Central Flying School. RUPERT F. SIMMS, F/S. JET BOMBERS Author VindicatedI N Flight of July 18th last year the Douglas XB-43 was described by Mr. H. F. King in his article on Jet Bombers as an adaptation of the piston-engined XB-42 "Mixmaster." Writing from New York, Mr. Christopher Clarkson was not slow to contradict this, adding that it would be fairer to say that the XB-42 was an adaptation of the "43 " The author's defence of his original contention evoked from a correspondent, signing himself "Test Pilot" (and whom I suspect is a very famous one indeed), the affirmation that, by virture of his service in the U.S.A., Mr. Clarkson's knowledge should be second to none, and describing as "unkind" the manner in which Mr. Clarkson had been " shot down in flames." I have no intention of re-opening the correspondence, though it was instructive more than vindictive, but I would refer Mr. Clarkson and " Test Pilot " to an article by Mr. Carlos Woe* chief of Douglas's preliminary design section, in the nautical Engineering Review of January this year. Here Mr. Wood, whose pronouncement must surely be final, unequivo- cally describes the XB-43 as a development of the XB-42 and presents a mass of material which proves that, far from being a mere prototype of the jet machine, as suggested by Mr. Clarkson the Mixmaster was designed and built to meet a very real operational need. " LOYAL SUBJECT." DELAY IN AWARDS Complaint from Australia SEVERAL letters in copies of Flight recently reaching ushere have criticized the delay in presenting decorations. The position is the same in Australia, my brothers and I served with No. 103 Squadron R.A.F. and we are still waiting for some sign of our awards. Maybe the mails are too crowded to allow them to be posted. :.-:-.. D. A. HENRY, R.A.A.F., F/L. :; 113 A.G. Hospital, New South Wales. [Aircrew due for awards are referred to Flight, October 10th, 1946, page 408, in which we published a statement to the effect that His Majesty deeply regretted his inability to present awards to each recipient personally (there are some 55,000 still outstanding), but that a personal letter would be sent with each decoration delivered by post. Application must, therefor©-, be made giving name, Service number, rank, decoration and address to which the decoration is to be sent. These details must be forwarded to the Under Secretary of State, Air Ministry (S7(d)), Adastral House, London, W.C.2.—ED.] // the reader who signs himself "Air Traffic Control Officer, Grade III " will send his name and address (not for publica- tion) we will consider publication of his contribution.—ED.
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