Here is some information if you want to convert your Skyfox to electric:
1 | Compulsory because of the much higher torque:
the replacement of the plastic internal tooth gear by the steel version – Ord.No. 36/47
2 | Vario offers sets to make the electric conversion of the Skyfox complete:
Ord.No. 3314/6-30 and 3312/6-30 are for older Skyfoxes that have M3.0 threads in their gear boxes.
Ord.No. 3314/6-35 and 3312/6-35 are for Skyfox mechanics from 2010 onwards. They have M3.5 threads in their gear boxes
3314/6-30 and -35 are for 1800 mm rotor disc:
3312/6-30 and -35 are for 1500 mm rotor disc:
3 | Optional: a new main gearbox Ord.No. 1006/10. This has M3.5 threads.
There is also an aluminum version Ord.No. 1006/15. This has M3.0 threads.