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Aviation History
1923
1923 - 0272.PDF
SOCIETY OF MODEL AERONAUTICAL ENGINEERS (London Aero Models Association) IN acceptance of the invitation of the Dutch Society, the P.A.S.C., the Council, on Wednesday, May 9, elected their Competition Secretary, Mr. C. Bayard Turner, to represent the aeromodellists of Great Britain and give a practical demonstration of model flying at the Dutch national Competi- tion for Model Aeroplanes, which will be held at Waalhaven Aerodrome on June 17. It was overlooked last week the fact that Mr. Burchell has offered a very fine propeller for the best flight other than a prize-winning flight, which is made before Saturday evening, May 19. Judging to be on the loading times duration basis. Practice flying took place during the week end, but the weather prevented any very meritorious performances. Members are reminded the entries for the " Gamage Cup " Competition must be received by the Competition Secretary before 8.30 p.m. on Friday, May 18. Hon. Secretary: A. E. Jones, 48, Narcissus Road, West Hampstead, N.W. 6. POWER PLANTS FOR MODEL AEROPLANES By A. F. Houlberg Concluded from page 258) Petrol Motors " I have, as yet, not seen a really good attempt at a model petrol motor of small size, the best example so far produced being the small V twin of Mr. Staager, which until recently held the power-driven record with a duration of 53 sees. I can see no reason why a twin-cylinder motor of 1-in. bore by 1-in. stroke should not be made to work satisfactorily and comfortably develop £ b.h.p. with a weight not exceeding 2 lbs. We will take the four-stroke engine first, and investigate the question of the best type for our purpose ; we have for choice the single cylinder, the horizontally opposed twin, the side-by-side twin, and the 90° V twin. The single cylinder has bad balance with a bad torque diagram, and gains nothing on the score of weight, since it requires a fairly heavy flywheel to smooth its running ; it can, therefore, be dismissed. The side-by-side twin has an even torque diagram and fairly good balance, but air cooling the cylinders evenly is difficult, as they are close together. The 90° twin has excellent balance but an indifferent torque diagram, although the cooling problem presents no difficulty. The H.O. twin has excellent balance, good torque diagram, is easy to cool adequately, and is undoubtedly the better type to use. The problem of the best type of two-stroke is modified by the fact that one-power stroke per cylinder occurs in each revolution of the crankshaft. Thus we find that the two- Stroke single cylinder has a better torque diagram than the single cylinder four-stroke, but its balance is no better. The side-by-side twin two-stroke, however, has a better torque diagram than any of the four-stroke types reviewed, while its balance is equal to that of the side-by-side four-stroke. The 90° twin two-stroke has a fair torque diagram and its balance is good, but the H. O. twin two-stroke has a poor torque diagram—in fact, no better than the single cylinder, although its balance is excellent. From this we see that the position of affairs is somewhat reversed, and the two-cylinder side-by-side is the best type for a two-stroke. We now come to the question of ignition, and the problem of producing a light apparatus is without doubt the greatest difficulty we have to overcome if we desire to obtain small petrol plants. The magneto is useless, as it is too heavy and cannot be greatly reduced in size without reducing its output too much. The flywheel magneto can be made considerably lighter, but has the same restrictions on size reductions. The only scheme left is battery and coil ignition, a scheme which has successfully stood the test of time, and which is daily increasing in fa.vour. A trembler coil not more than 6 ozs. can easily be made, and with a dry battery weighing 4 ozs. gives an ignition apparatus weight of 10 ozs. With a motor weight of 2 lbs. this gives us a total weight of 2 lbs. 10 ozs., and if it develops J b.h.p. we should obtain a thrust of at least 4 lbs., or considerably more than the total weight of the plant. "Coming Events Cast Their Shadows," etc. " MR. NEWBOLD, M.P., has been elected an honorary member of the Bolshevist Air Fleet."—Daily Paper. " Well, he has only himself to blame."—Punch. At the moment of going to press his Parliamentary future is distinctly, and rightly, in the air. MAY 17, 1923 The Grand Prix Balloon Race THIS year's Grand Prix for balloons was not very success- ful. A terrific wind was blowing at the time of the start on May 13, and out of the 20 balloons entered four were destroyed on the ground by the gale, while a fifth escaped as it was being filled. Out of the remaining 15 the one which appears to have made the longest journey is No. 3 (" Vieille Tige ")». • which, piloted by Moineau, landed at Commercy (Meuse), having covered a distance of 295 kilometres (114 miles). Up to the present Veenstra's balloon has not been accounted for. as m m m IMPORTS AND EXPORTS, 1922-1923 AEROPLANES, airships, balloons and parts thereof (not shown separately before 1910). For 1910 and 1911 figures see " FLIGHT " for January, 25, 1912 ; for 1912 and 1913, see ' FLIGHT " for January 17, 1914 ; for 1914, see " FLIGHT " for January 15, 1915 ; for 1915, see " FLIGHT " for January 13. 1916; for 1916, see "FLIGHT" for January 11, 1917; for 1917, see " FLIGHT " for January 24, 1918 ; for 1918, see "FLIGHT" for January 16, 1919; for 1919, see "FLIGHT" for January 22, 1920 ; for 1920, see " FLIGHT " for January 13. 1921 ; for 1921, see " FLIGHT " for January 19, 1922 ; and for 1922 see " FLIGHT " for January 18, 1923. Imports Exports Re-Exports 1922. 1923 1922. 1923. 1922. 1923 ilk £ £ £ Jan. .. 1,152 466 76,552 60,079 23 280 Feb. .. 567 641 69,129 120,236 1,100 3,040 Mar. .. 1,471 589 166,607 71,945 100 689 April .. 3,846 8,508 139,995 167,757 5,880 462 7,036 10,204 452,283 420,017 7,103 4,471 Note.—The trade returns for April are prefaced by a statement that fromApril 1, 1923, these accounts include the trade of Great Britain and Northern Ireland with the Irish Free State. From the same date the direct foreigntrade of the Irish Free State has been excluded from these accounts] m m m m. NEW COMPANY REGISTERED AIR VENTURERS, LTD..—Capital £100, in £1 shares. Manufacturersand warehousers of aeroplanes, etc. Solicitors : Kenneth Brown, Baker, Baker, Lennox House, Norfolk Street, Strand, W.C. PUBLICATIONS RECEIVED National Advisory Committee for Aeronautics: Report No. 157. Nomenclature for Aeronautics. Technical Notes No. 129. Notes on Aerodjmamic Forces on Airship Hulls. By L. B. Tuckerman. March, 1923. No. 130. Model Supports and Their Effect on the Results of Wind Tunnel Tests. ByD. L.Bacon. February, 1923. No. 131. Varia- tion in the Number of Revolutions of Air Propellers. By W. Achenbach. March, 1923. No. 132. The Increase in Dimensions of Airplanes—Weight, Area, and Loading of Wings. By E. Everling. March, 1923. No. 133. Disturb- ing Effect of Free Hydrogen on Fuel Combustion in Internal Combustion Engines. By A. Reidler. March, 1923. The National Advisory Committee for Aeronautics, Washington, D.C., U.S.A. NOTICE TO ADVERTISERS All Advertisement Copy and Blocks must be delivered at the Offices of " FLIGHT," 36, Great Queen Street, Kingsway, W.C. 2, not later than 12 o'clock on Saturday in each week for the following week's issue. FLIGHT The Aircraft Engineer and Airships 36, GREAT QUEEN STREET, KINGSWAY, W.C. 2. Telegraphic address : Truditur, Westcent, London. Telephone: Gerrard 1828. SUBSCRIPTION RATES " FLIGHT " will be forwarded, post free, at the following rates :— UNITED KINGDOM ; ABROAD* s. d. ; s. d. 3 Months, Post Free... 7 7 j 3 Months, Post Free... 8 3 6 „ „ ...15 2 j 6 „ „ ...16 6 12 „ „ ...30 4 ! 12 „ „ ...33 o These rates are subject to any alteration found necessaryunder abnormal conditions and to increases in postage rates. * European subscriptions must be remitted in British currency Cheques and Post Office Orders should be made payable to the Proprietors of " FLIGHT," 36, Great Queen Street, Kingsway, W.C. 2, and crossed London County and Westminster Bank, otherwise no responsibility will be accepted. 272
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