Declined Belts

When the tangential velocity is sufficiently high, the material will leave the belt and commence its free fall trajectory at the initial point of tangency with the pulley (point c on the diagram)

i.e. when V²/gR = cos

where = belt angle of decline.

Fig F

When the tangential velocity is not sufficiently high, the material will continue part way around the pulley to the point c where it commences its trajectory an angular position from the vertical centre line of the pulley point Z where

V²/gR = cosδ

Fig G