i'm thinking 70kgcm still implies i'll need a gear or pulley to make it effective, although I could tie a rope to my ankle and see if it would drag me. it would need a spool to collect the rope on.

turns out 70kg is 154 lbs, which is about my weight, so if the spool were under a centimeter radius then it could lift me off the ground directly if tied to the head.

I guess that's the plan!