Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

70 to 83%
80 to 90%
45 to 60%
63 to 70%

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Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Open and crossed belt drives transmit same power
Crossed belt drive transmits more power than open belt drive
Open belt drive transmits more power than crossed belt drive
Power transmission does not depend upon open and crossed types of constructions

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