440Solutions Manual• Instructor’s Solution Manual to Accompany Mechanical Engineering DesignThe pitch diameter of the ﬂywheel isDP−2δ=DDP=D+2δ=60+2(0.716)=61.43 inWe could make a table:DiametralSectionGrowthABCDE2δ1.3π1.8π2.9π3.3π4.5πThe velocity ratio for the D-section belt of Prob. 17-20 ism±G=D+2δd=60+3.3/π11=5.55Ans.for the V-ﬂat drive as compared to ma=60/11=5.455 for the VV drive.The pitch diameter of the pulley is still d=11 in, so the new angle of wrap, θd, isθd=π−2 sin−1±D+2δ−d2C²Ans.θD=π+2 sin−1±D+2δ−d2C²Ans.Equations (17-16a) and (17-16b) are modiﬁed as followsLp=2C+π2(D+2δ+d)+(D+δ−d)24CAns.Cp=0.25³Lp−π2(D+2δ+d)´+µ³Lp−π2(D+2δ+d)´2−2(D+2δ−d)2Ans.The changes are small, but if you are writing a computer code for a V-ﬂat drive,
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