High Altitude ball bearings

[Cosmoneer]

Bearing grease may play a factor at high altitudes, so low friction grease-less bearings will be a better option.


http://www.vxb.com/608-Si3N4-Ceramic-High-Clearance-Bearing-4-balls-p/608-C4-SI3N4-PTFE.htm?gclid=EAIaIQobChMI_N7YkpHO1wIVjiWBCh2aKQOlEAYYASABEgI7pvD_BwE

Also, for our purposes of CMG design, since we may not run the drive motor the entire flight, we will need a clutch system that only engages when we need it to.

http://www.vxb.com/CSK8-One-way-Sprag-Freewheel-Backstop-Clutch-p/kit8176.htm