Calculating minimum Battery "C" - ampere, needs

[Vampiriste]

I'm thinking about two types of motors for my Octacopter, running on 4S....what is the minimum C rating I should use?

iPower 4114 700 (1555 & 40A ESC),
http://www.funtobuyonline.com/brush...-mt4114-700kv-for-multicopter-hexacopter.html
and
EMAX MT3515 (1540 & 40a ESC)
http://www.emaxmodel.com/views.asp?hw_id=1297

 

[kloner]

how many mah are you planning on flying? what kinda AUW are you thinking this is gonna be? payloads?

 

[Vampiriste]

2 x 16000 mAh, on a coaxial 8 on foldable X4 frame, with lower push on +10%, 8 kg working,