I´ve just bought a set of MN3110 for my hexa. Looking at the performance table (attached) the effitienty (gr/watt) decrease significantly with the number of cells.
Por instance, a copter of 2.6 Kg requires 433gr/motor, so you can get it with:
204watt using 3S or
288watt using 4S wich is 41% !!! higher and this is proportional to flight time.
This clearly indicates to use 3S intead 4S for this reason. In a small quadcopter I have (1 Kg) I´ve experienced this big difference (I use 3S, with MT2212 and 2200mAh). When using 4S with same h/w I clearly obtain much lower effitiency.
Any experience on this phenomenon?
Angel