Master Connecting Rod: In a radial aero engine the large connecting rod linking one of the pistons to the crankshaft. Articulated rods are connected to the big end of the master rod and transmit the power from the other pistons.
bearing, called an articulating connecting-rod assembly. The main rod or master rod joins one of the pistons with the crankshaft, and the other rods, called articulating rods or link rods, connect the other pistons to this same master connecting rod.
 
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