Propeller selection is a difficult matter. In fact is the combination propeller/motors.
I´ve been testing many combinations in AQ, but I´ll report the more effitients, IMHO.
I´m using basically three combinatinons motor/prop all on same Quad mid size (1Kg w/o battery)
conf-1) motor MT2212-16 KV750 & propeller GF 10x4.7
conf-2) motor RCT 5010-14 KV360 & propeller carbon 15x5.5
conf-3) motor RCT 5010-14 KV360 & propeller carbon 16x6.5 (see image below)
Main conclusions I´ve got are the following:
a) Effitiency.
Big increase using large propellers, that is conf-2 is the best. I get almost a 45% more flight time than conf-1 (11 min on conf-1 vs 16 min in conf-2 with a 3S-2200mA). I get also long time flights: 40min+ with a 4S-4000mA in conf-2
Conf-3 not yet tested in flight time, but I thing the pitch is too high (6.5) so not so good, but still TBD
Stability
Large propellers induces instability when moving out with a pulse of PH or RTL. It´s needed to reduce NAV_SPEED IM,OM,PM to 10,15,10 respectively to avoid the divergence (see my post on that also)
Under windy days large prop are much more sensible. Need of tunning. Deffault PIDs are goog for conf-1 but not for larger prop.
Altitude tunning is also needed for larger props. I use NAV_ALT_POS_P = 0.15 and NAV_ALT_SPED_I = 1.85 to avoid up/down jumps.
Others.
- Larger are more expensive
- larger are mor difficult to transport
- larger are easy to brake
... but in a calm day larger props fly soooo well and smoooth that I love it.
Angel