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Aviation History
1910
1910 - 0623.PDF
not apply in free flight. The yacht designer aims at getting the centre of effort on his sails as low as possible, in order to reduce the heeling moment, which is repre sented by the product of the lateral pressure multiplied by the leverage provided by the height of the centre of pressure above the centre of buoyancy. Thus for a given area the taller the sail is in proportion to its width, the higher will be the centre of pressure, and the greater the leverage. And not only so, but the disposition of the weight of the sail and of the accompanying spars would all tend lo make a boat top-heavy if they were of the rectangular form which is suitable for free flight. There are many other considerations which yachts men will readily enumerate for themselves as to why sails are shaped as they are, but we have perhaps said sufficient to show why aspect ratio does not carry the same weight in yachting as in flight. Aspect Ratio in Sails. It is of course a little difficult to consider the full rig of a yacht collectively from the aerodynamic standpoint, it is a problem of some complexity, and as Mr. Sherrin remarks in his letter, sails have not been evolved to their present form without a vast amount of thought being expended on them. When we say, therefore, that aspect ratio does not carry the same weight in yacht design as in the design of flyers, we do not mean to imply that it is aerodynamically of any less importance, but merely that to the naval architect it does not appear as an independent principle in the same way, for instance, as the camber of the sail. That the student of flight may learn a very great deal indeed from the study of sailing there is no question, and it may even be that, old as the art is, those who design boats with sails may yet find that they can learn something more by closely following the development of flight. DREADNOUGHT*' ROTARY ENGINE DEPOSITS. AT the request of the "Dreadnought" Rotary Engine Syndicate we have pleasure in publishing the letter hereunder, dated July 26th, addressed to the Editor of FLIGHT. After very urgent requests we have been promised details of this engine in about two months time, although at the present time we have no more knowledge of the '' Dreadnought" engines than our readers. We are therefore willing to act as temporary trustees for any deposits in connection with this engine, on condition that such deposits are banked in the name of the Proprietors of FLIGHT for a maximum period of six months, at the end of which period, if the engines have not been delivered to and approved by the depositors, such deposits will be returned to each depositor. The following is the communication from the Syndicate :— " To the Editor of FLIGHT. " Dear Sir,—We are rather in a dilemma about the deposits offered us on these engines, and we are writing to ask you if you could give us a helping hand and at the same time act as the protectors of your readers, many of whom are prepared to pay down in advance £250 each for 7-cyl. Dreadnought rotary engines. The difficulty is that the figures seem building up beyond anything we ever expected, and we do not pose as having the credit equal to a first-class banking house, that can accept practically any amount of deposits that may be offered to it, without raising suspicions. "In our case the situation is as follows:—If we receive orders for 5,000 engines, and receive ^250 deposit in cash from each person, this amount will represent ;£ 1,250,000. " We fear people may say : If you get this amount of deposits, we shall never see you again or our money. " We also think it only right to point out to you that as our advertisements, asking for these deposits, appear in your most popular and respected paper FLIGHT, that to some extent you may also think you have a duty to perform towards your readers, and doubtless you have the right to ask us, What are you going to do •with those deposits ? " That is the difficulty. If you would consent to it, we should be very pleased if you would take charge of this money, and bank it in the name of the Proprietor of FLIGHT, as trustee for the various depositors and also as a trustee for the Dreadnought Rotary Engine Syndicate, or, if you preferred it, in the joint names of the Proprietor of FLIGHT and of the Proprietor of the Dreadnought Rotary Engine Syndicate. " In each case the money to be held for a certain specified time, and only to be paid over to the Dreadnought Rotary Engine Syndicate when the customer in each case had sent his written consent to FLIGHT that he was satisfied with the engine after full trials of same have taken place. <•--<| " The Dreadnought Rotary Engine Syndicate would, of course, be prepared to pay all expenses to your paper for your out-of-pocket expense and trouble, and doubtless, by increasing our advertisements in your very excellent paper, endeavour to show our gratitude for thus getting us out of a somewhat delicate position. " Yours truly, " July 26th. THE DREADNOUGHT ROTARY ENGINE SYND." The latest Tellier racing monoplane, fitted with a 45-h.p. Panhard engine, which will be used at the big International-meeting at Lanark by Audemars. The weight is 350 kilogs., span, 9 metres; length, 9 metres and surface, 20*2 square metres. 621
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