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Aviation History
1913
1913 - 0635.PDF
JUNE 14, 1913. Mr. P. H. Wilkioson's Olympia Scale Model. General Details.—Two-seater (sociable) military model fitted with dual control and electric searchlight, all control wires being in duplicate. Being essentially a scale model 75 ins. to the ft.), a dummy 100-h.p. Vic type motor with magneto and flywheel is fitted, but a rubber twin geared motor could also be used as there are fittings for the same. Torpedo covered in body, with non-inflam mable celluloid windows in the sides and bottom. Framework of aluminium tubing. Controls.—Pivoted lever for elevator, with wheel at top for lateral control. Footbar control lor rudder. Length 29 ins. ; span 39 ins. ; weight 16 ozs. ; total area 253 sq. ins. ; area of wings 221 sq. ins. ; loading lo\i ozs. to sq. ft. ; probable speed (of full-sized prototype) 70—80 m.p.h. Wings.—Double-surfaced, each with 7 ribs fitted with duplicate interwarp control wires to ailerons. The spars fit into sockets in the fuselage, the wings thus being easily removed for transport by unfastening the bracing cables. Average chord 6J ins. Length of wing 17 J ins. Ailerons 6 ins. by 2J ins. (crescent shaped). Variable dihedral angle. Tail.—Fan shape, non-lifting ; length 7 ins. ; span 8 ins. ; elevators 375 ins. by 1 -5 ins. (crescent shaped). Rudder.—Balanced ; height 4 ins. ; length 4*5 ins. Propeller.—Tractor-type integrate ; diam. 10 ins., carved from the solid (mahogany). Fuselage.—Circular, streamline form, max. diam. 4 ins. Chassis.—Aluminium tubing ysf, in. and /5 in. diam. Wheels.—Disc, 175 in. diam., sprung on leaf spring. Length of skid 9 ins. Wheel track 7 ins. Tail skid ^ in. aluminium tubing, rubber sprung. Mr. Wilkinson (15, Murray Road, Rugby) would be pleased to hear from anyone interested in models who lives in that district, with a view to forming a club. Efficiency Formula. Mr. F. Whitworth forwards us the following communication re the efficiency formula recently given in this section : " In its present state it seems rather senseless: I will give two practical cases to illustrate my point. Model A weighs 4 ozs., is driven by 1 oz. of rubber, and flies 400 yds. in 40 sees. Model B weighs 4 ozs., is driven by § oz. of rubber, and flies 200 yds. in 20 sees. The effici ency of these two models is undoubtedly the same, but yet, according to the efficiency formula, model B would get twice as many marks as the model A, as shown below :— [/nGHT 4 x 400 , (A) An = 40 marks. (B) 4—-— = 80 marks. Hand-launched OS groand ... i x 40 ' ' *5 x 20 " To prove this is so, let us take model A when it has flown 200 yds. ® ® KITE AND MODEL AEROPLANE ASSOCIATION. Official Notices. British Model Records. (Distance ... R. Lucas ... ... 590 yards. ' \ Duration ... A. F. Houlberg ... 89 tecs. f Distance ... <;. Rowlands 252 yards. '(.Duration ... J. E. Louch 68 sees. Hydro, off water ... Duration ... F. Whitworth ... 37 sees. Single-tractor screw, / Distance ... F. G. Hindsley ... 173 yards. hand-launched ... I Duration ... J. E. Louch 68 sees. Do., off ground ... Duration .. J. E. Louch 45 sees. Application for Affiliation.—An application for affiliation has been received from the Reigate, Redhill and District Aero Club. The number of affiliated clubs to date are as follows:—Aero-Models Association (Northern Branch), the Bristol and West of England Aero Club (Model Section), Hendon and Districts Model Aero Club, Leytonstone and Districts Aero Club, North.East London Aero Club, Paddington and Districts Aero Club, Reigate, Redhill and District Aero Club, Sheffield Model Aero Club, Wimbledon and District Model Aero Club. Official Trials.—The next official trials will be held on the Hendon and Districts Model Aero Club's ground on Saturday, June 21st. Instructions as to route for those entering :—Tube to Golders Green ; on leaving station, turn to the right for a few yards, then again to right down Rodborough Road. This continues into a road called The Vale ; follow this road to about 100 yards from bottom, and the fields will be seen on right hand side of road. About 10 minutes' from Golders Green Station. From Cricklewood, Willesden, &c, the way is via Cricklewood Lane, turn to left along Greenfield Gardens, which leads to The Vale, thence as Toute above. "Model Engineer" Exhibition.—The aviation section of this exhibition, to be held at the Royal Horticultural Hall from October 10th to 18th inclusive, will be organised by this Association, and the Council hope all will endeavour to help make this an unqualified success. The following are the five classes (entrance fee, 2s. 6d. per model) in which models can be entered, and attention is called to the fact that there will be flying tests in Classes 1, II and IV :— Class I, Power-driven models; Class II, Model hydro-aeroplanes; Class III, Scale models, and models embodying new ideas applicable to full-size machines; Class IV, Rise-off-ground models ; Class V, Aero motors for models. In Classes I, II and IV flying tests will be made after the close of the exhibition, and the performances of the models will be taken into account in awarding the prizes. Competitors will be notified as to time and place of these trials. Competitors in Class V will be required to submit their motors to a bench test to be arranged by the judges. Silver and bronze medals are offered for the best models in the above classes. For general conditions for this competition apply to the Secretary of the K. & MA. A. All entries must be made on the official entry form, We might say that it has used half of its rubber ; the efficiency now would work out at So. Vet surely ii is impossible for a model to become less efficient with increasing length-duration of flight. " My idea of an efficiency formula for models is weight of model x (distance less windage) ,,„ *-_'•-„ weigh, of rubber • * here Mr. Ian Burrell made a mistake is by Heating rubber in the same way tbtf he would treat a petrol or steam engine. In the latter case the |*>wei given out remains the same, no matter how long it runs. But with rubber it is different. If a rubber motor gives out J-h.p. when made to run for 30 sees., it will only give out J-h.p. if made to run for 00 sees. Mr. Burrell's formula is applicable to power models, and would read weight of model x distance „ . ... ,. , , • , . —s r : . But this would only be judging h.p x time ' J ~* •» efficiency so tar as speed is concerned. There are other factors, such as climbing, &c" Mr. Ian Macdon ell's Twin-Winder. In this winder (of which we give an illustration) the rubber strands, instead of being fastened direct to the hooks, are fastened to a small wire ring which, in its turn, rests in the hooks. v " Flight " Copyright. Mr. Ian Macdonell's twin-winding system. When it is desired to wind up the rubber motors, the rings are slipped off and hooked on to the double winder (which 1 had con verted from an egg-beater by Messrs. J. Bonn and Co.) [we were not previously aware that Messrs. J. Bonn and Co. specialised in egg-beaters], and the winding is done as usual. I have used this method for several years, and have always found it quick, simple and effective. Model Club for Westc!iff>on'5ea. Mr. E. Procter, 96, Valkyrie Road, Westcliff-on-Sea would be glad to hear from anyone in that neighbourhood interested in models, with a view to forming a club in that district. ® ® Competitions.—On Saturday, June 7th, the third annua] competition for the Model Engineer Challenge Cup took place on Wimbledon Common in a gusty wind. This year the competition was altered from hand-launched to rlae>off- ground. Mr. J. E. 1-ouch, of the North-East London Club, proved the winner with 76 sees, duration, therefore holds the handsome trophy for the year, and won the Model Engineer silver medal which accompanies the cup. Mr. C. C. IJutton, of Paddington Club, with 52 sees, took the Association silver medal, and Mr. H. G. Bond, third, taking the bronze medal of the Association. The judget were Messrs. V. E. Johnson, G. R. Bragg-Smith and W. H. Akehursi. The following shows the test duration made by the first ta (all monoplanes) out of the three trials allowed :—1. J. K. Louch (N. K. London Club), duration, 76 tecs. . 3. C. C. Dutton (Paddington), 52 sect. ; 3. H.G. BondfN.rC. London), 50sect. ; 4. W. J. Williams (K. & M.A.A.), 46 sees.; 5. F. W. JamiawayfK. k M.A.A.), 44 sees.; 6. G. Rowlands (K. & M.A.A.), 43 sees.; 7. R. Lucas (K.. & M.A.A.), 39 sees. ; 8. T. Carter (Paddington), 36 tecs. ; 9 H. P-ate (K. & M.A.A.), 35 sees.; 10. H. Weston (K. & M.A.A.), 33 sees.; 11. A. K. Houllx-rg (K. & M.A.A.), 26 sees.; 12. L. H. Slatter (K. & M.A.A.), 14 sect. There were 26 entries, 5 of these failed to compete. The holder, Cyril Ridley, was unable to compete owing to business engagement. The time limit had to be enforced on two occasions, and competitors should note that it will lie rigidly enforced throughout the year, also that no trial flights will be allowed after the start of any competition. This rule was broken on Saturday by one competitor, and it disqualified him from one round. The prizes were distributed by Mrs. Akehurst. Hydro Competition.—To-day, Saturday, 14th, at Welsh Harp. An interesting contest should take place, there being a good entry, among which in a power- driven machine. Gift.—The Council desires to thank Messrs. T. W. K. Clarke & Co. for the gift of a set of enamelled stakes and wire rope for protecting the rising turface when used on public groundt, so that the competitors shall not be impeded by tpectators. Model Competition, 100-Acre Field, Greenford (station, Perivale Halt, rm Westbourne Park), June a8th, at 3 p.m. Entries close June 21st. Kree to members; non-members entrance fee, if. Longest Flight Competition lot Models—Rising off ground under their own power. (Open to the world.) Prizes (presented by A. W. damage, Ksq.): 1st, challenge cup and gold medal: 2nd, silver medal; 3rd, bronze medal. Rules: I. Competitors may submit models of any kind. 2. Competitors must be at the judges' flag at 3.4s tliarp. Those not present at that time will be disqualified. 3. Reasonable repairs will be allowed at the discretion of the judges. 4. Models must start under their own power. 5. Each competitor is entitled to three trials, if time permits. 6. The length of flight will be measured in a straight line, from Hatting point to alighting point, and not along the line of flight. 27, Victory Road, Wimbledon, S.W. W. H. AKEHURST, Hon. Sec. 66l
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