An intrinsic way to control E-sail spin
  We show that by having the auxtethers made partly or completely of conducting material and by controlling their voltages, it is possible to control the spin rate of the electric solar wind sail by using the electric sail effect itself. The proposed intrinsic spin rate control scheme has enough control authority to overcome the secular change of the spin rate due to orbital Coriolis effect. 
Pekka Janhunen and Petri Toivanen
astro-ph.IM physics.space-ph