Once the MAXIMUM CHAIN PULL has been established, the following calculation for head shaft power requirements should be employed.
Mt = Torque (Kg m)
N = Power CV.Hp or KW)
R = Head Shaft RPM
P = total chain pull
dp = PCD of Drive sprockets (m)
From these two relationships it is concluded
From which is derived
The useable power output to be established must take into account losses from reduction with chain and belt transmissions.