. Automotive industries . engine, and recently the 60 degree Vee eight-cylinderengine has come to the fore by its adoption for use on theLincoln and Wills-Sainte Claire cars. There are two main objects aimed at when going to thecomplication of an engine with as many as eight cylinders,namely, balance of the reciprocating parts and uniformityof crank effort or torque. If the explosions come at equalintervals the crank effort will be the same no matterwhether the cylinders are arranged vertically or in Veeform. But with 45 degree and 60 degree Vee eight-cylin-der engines it is impossible to get
. Automotive industries . engine, and recently the 60 degree Vee eight-cylinderengine has come to the fore by its adoption for use on theLincoln and Wills-Sainte Claire cars. There are two main objects aimed at when going to thecomplication of an engine with as many as eight cylinders,namely, balance of the reciprocating parts and uniformityof crank effort or torque. If the explosions come at equalintervals the crank effort will be the same no matterwhether the cylinders are arranged vertically or in Veeform. But with 45 degree and 60 degree Vee eight-cylin-der engines it is impossible to get evenly spaced explosionsif the ordinary four-throw crank is to be used, which isnecessary for the sake of compactness. It is reportedthat the 45 degree Vee Liberty engine showed a great lealof vibration. Theoretically there are no greater vibratingforces in a 45 degree than in a 90 degree Vee eight-cylin-der engine, but the direction of these forces is entirely dif-ferent. Whereas the direction of the vibrating forces is. Fig. 1 — Diagram of Vee engine nearly vertical in the 45 degree engine, with only slighthorizontal components, in the 90 degree engine these forcesare absolutely horizontal, and it is conceivable that an air-plane is much more sensitive to vibrating forces in a ver-tical plane than in a horizontal plane, owing to its muchsmaller vertical rigidity. The writer first investigated the subject cf vibratingforces in eight-cylinder Vee engines with different anglesof Vee in an article printed in The Horseless Age of Feb. 1,1916, and came to the conclusion that with a 60 degreeangle of Vee the vibrating force is of constant value anduniformly rotating, the same as the vibrating force due toa rotating unbalanced weight. It rotates at twice theangular speed of the crankshaft and therefore cannot bebalanced by weight rotating with the crankshaft. Itsvalue is only about 61 per cent of the maximum value ofthe unbalanced force in a 90 degree eight-cylinder engine. The met
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
