Winch 1 consists of two drums a and b of radii R and r, and rotates about fixed axis A-A. When the winch is rotated clock- wise, looking from the right, flexible link (rope) 2 is wound on drum a and unwound from drum b. At this, load 4, suspended from pulley 3, around which link 2 runs, is hoisted an amount h per revolution of the winch, equal to h=π(R-r).
$3520$SFL,MH$