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Aviation History
1921
1921 - 0239.PDF
APRIL 7, 1921 THE HAACKE 30 H.P. AERO ENGINE AERO engines of really low horse-power—30 and under—are demand for these engines from the aeroplane designer, orfew and far between, as are aeroplanes fitted with such whether the latter are waiting for the supply before they •engines. Whether engine designers are waiting for the produce the small 'bus, is a moot point—perhaps, as the • l'2-i" , 'niiiiirr Tiilf l[|ITt 8-s" THE HAACKE 30 H.P. AERO ENGINE : Plan and end elevation The Haacke 30 h.p. Aero Engine : Rear and front views. 239 schoolboy said, " the answer is inthe affirmative." Of one thing, how- ever, we are certain, and that is, thecombination of the small engine and aeroplane present possibilities worthyof thorough and immediate develop- ment. A small engine that has, we believe,given very good results is the 2-cyl. opposed air-cooled model constructedby the Haacke Co., of Johannisthal, Berlin, who have also producedother successful engines in 3-cyl. fan- type 35 h.p., a 5-cyl. radial 60 h.p.and 10-cyl. radial 120 h.p. models— the former type being fitted to theW.K.F. sporting biplane previously described in FLiGHT(August 19,1920). The 2-cyl. model is made in twosizes, one having a bore and stroke of 112 mm. and 140 mm. respect-ively and developing 28 h.p. at 1,300 r.p.m., and the other havingan increased bore of 120 mm., de- veloping 30-35 h.p. The cylinders,which are semi-steel castings with integral cooling fins, are staggered3| ins., allowing an exceptionally strong crankshaft construction. Thevalves are located in the head and are operated.by push-rod and rockerarm j mechanism of the conven-
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