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Aviation History
1924
1924 - 0364.PDF
fimi . Revolutions per min. Weight in lbs. Petrol consump tion (lb./h.p./h.) Oil consumption (lb./h.p./h.) No of valves per cylinder Blesk.' 1,400 450 0-506 0-044 2 Perun I." 1,400 660 0-43 0-022 2 "Perun II.' 1,400 680 0-43 0-022 2 ' 450 h.p 1,400 1,100 0-43 0-022 4 It will be seen that in all cases both petrol and oil consump tions are relatively lo'w, even compared with British aero JUNE 5, 1924 the inlet valves and one the exhaust valves. No photograph of the 450 h.p. engine is available at the moment. J. Walter a Spol, Prague THE firm of J. Walter and Co. is one of the oldest Czech automobile manufacturers, and it is only during the last two years or so that they have turned their attention to the design and manufacture of aero engines. Nevertheless, already three separate types have been produced, all of which have, apparently, behaved well and are the present holders of the national records. The first engine to be produced was the little five-cylinder Front, side and rear views of the five-cylinder 60 h.p. Walter engine. engines. The " Blesk " has been designed to supplant the 100 h.p. Mercedes engine where this has been fitted. In the Czech air service it is used mainly on school machines, and is stated to be very reliable. The " Perun I " and " Perun II " are generally similar, as the accompanying photographs will show, but " Perun II " is a high-compression engine, which probably accounts for the extra power accompanied by but small increase in weight. Both engines are, as already mentioned, of the six-cylinders- in-line type, with separate cylinders and overhead cam shafts. The new 450 h.p. engine, of vee-type (60 degrees) has four valves per cylinder, operated by overhead cam shafts of which there are two for each bank, one operating radial air-cooled of 60 h.p. This was designed for school work and sport 'planes, and is shown in the accompanying photographs. The other two types manufactured by Walter are six cylinder vertical engines, water-cooled, of course, one being" rated at 185 h.p. and the other at 240 h.p. Of these two engines no photographs are, unfortunately, avail able. The 60 h.p. radial Walter is of very clean design, as will be seen from the photographs. The bore and stroke are 105 and 120 mm. respectively, and the rated power of 60 b.h.p. is developed at a speed of 1,400 r.p.m. The petrol consumption is stated to be very low, i.e., 230 grammes (0-506 lb) per horse-power per hour. The oil consumption r-~. % :';• -: •'. s •-:-'. ';,'< •'.-, £-'- •r,i-^. .-.-•• .-5 -- . •# • :• •; ?.-.'-3 ---'•' ' •:-!:< •"•'•'•: > tsm ':',.- ".'/•,•'* ~y;-'£>'M '£''•':'& •smm mmtiti mm '' Coan casts clean crankcases.'' The Czech equivalent to the famous Coan aluminium casters is the Skoda Works : A pile of aluminium castings, of which this firm makes a speciality.1 364
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