Consider the following data relating to a horizontal reciprocating engine. Weight of reciprocating parts $-125$ kg$,$ weight of connecting rod $-100$ kg$,$ length of stroke $-20$ cm$,$ length of connecting rod between centres $-40$ cm$,$ radius of gyration of connecting rod about an axis through centre of gravity $-12$ cm$,$ distance of centre of gravity of the connecting rod from big end bearing centre $-16$cm$,$ engine speed $-750$ rpm$.$ Find the resultant inertia torque on the crankshaft when the crank has turned $30$ from the inner dead centre. Consider connecting rod mass is put at the gudgeon pin centre and crank pin centre.