. The steam-engine and other heat-motors. the beginning of the return-stroke and closes30° before the end of the return-stroke; find the angle of advance,throw of the eccentric, and inside and outside laps. Ex. 38. Stroke is 2, steam is cut off at f stroke, maximum port-opening is 1; find the throw of the eccentric, angle of advance, andthe outside lap. Problem.— Draw the cross-section of a plain slide-valve tocomply with the following conditions: Width of ports 1/2;overtravel on the head end 1/4; cut-off on both head and crankends 3/4 stroke; stroke 18; steam admission commences onhead end wh
. The steam-engine and other heat-motors. the beginning of the return-stroke and closes30° before the end of the return-stroke; find the angle of advance,throw of the eccentric, and inside and outside laps. Ex. 38. Stroke is 2, steam is cut off at f stroke, maximum port-opening is 1; find the throw of the eccentric, angle of advance, andthe outside lap. Problem.— Draw the cross-section of a plain slide-valve tocomply with the following conditions: Width of ports 1/2;overtravel on the head end 1/4; cut-off on both head and crankends 3/4 stroke; stroke 18; steam admission commences onhead end when the piston is 1/4 from the end of its stroke;exhaust opens at 9/10 stroke on both ends; ratio of connecting-rod to crank = 5; initial steam-pressure 60 pounds absolute; backpressure 15 pounds absolute; clearance on each end 10%. Assumethickness of cylinder parts as 3/4. 108 THE STEAM ENGINE AND OTHER HEAT-MOTORS Construction (Figs. 75, 76). —Lay off the stroke XY ona scale 2 = 1; draw crank-circle X2Y; lay off connecting-rod arc.
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