the arrows indicate the respective normal directions of travel of the tow rope and pulleys a frame support member 36 is rigidly attached to the rear side of one a frame member 10 frame support member 36 has a tie down connection 38 for securing the entire frame assembly to a stake or rod in the ground behind the frame assembly tie down connection 38 is aligned along a line which is in a planar extension of the tow rope 30 and main drive pulley 38 and the ground anchor point is preferably positioned along the same planar extension to provide maximum anchoring stability for the frame assembly this arrangement eliminates any twisting moments to the frame caused by skiers 39 loading on the rope tow main drive pulley 28 is rigidly affixed to drive shaft 29 which passes through bearing assemblies 40 and 42 respectively which are attached to a top horizontal member 13 of each a frame 10 disabling arm 34 is bolted to a bearing assembly 35 which allows shaft 29 to pass therethrough in freely rotating fashion a drive sprocket 44 is rigidly attached to drive shaft 29 and is connected via a roller chain drive to a gear box of rotary power source 16 thus when power source 16 is activated it causes drive sprocket 44 to rotate shaft 29 which in turn causes main drive pulley 28 to rotate the rotation of.