I have been working out the faimly tree for the S2 / C4.1 this one is a bit longer than the Slim4
1 - Slim2 - Shafted driven mid motor - flat CF
2 - S2 - Reversed B4 3 gear gearbox - flat CF
3 - S2 - Reversed GT2 3 gear gearbox - flat CF
4 - S2 G4 - Carbon fibre 4 gear gearbox - flat CF
5 - S2 Q - Plastic casing 4 gear gearbox - flat CF
6 - S2 Tub - Plastic casing 4 gear gearbox -tub CF
7 - S2 SWB - Plastic casing 4 gear gearbox -tub CF SWB
8 - C4.1 - Plastic casing 4 gear gearbox -flat alum (proto flat CF)
9 - S2 Evo -
