r sqrt(x^2+y^2) Radius theta atan2(y,x)[rad] Angle Fu M/r Peripheral force F2 Fu/(exp(mu*beta)-1) Belt force on slack side C F2/(r*d) Variable used in load calculation Fn -C*exp(mu*(theta+beta)) Belt load, normal component Ft mu*C*exp(mu*(theta+beta)) Belt load, tangential component