12s, not flat out ( sorry I know everybody says that) it was too wet, few things changed since last post, new flier esc, new tp motor, dinogy grapheme batteries 2 x 6s 70c 5000mah alloy gear carrier now fitted, the new version of the flier really wipes the floor with the alien I had, better brakes, reverse actually works, iv'e bought 3 of them, will order a fourth soon