I all, Arducoter thrust and lift force problems at hight altitude ???
My question is: My 3DR have to flight between MSL 2000M and 4000M for scientific missions (bio-diversity monitoring in Alp contest). I make the first test yesterday, and my 850kv + 10/4,5 prop and 3S 2600mAp 30-45c, where not enough to lift my drone at ALT MSL 1900m (at the end i brake some blades and ouch... ;-( . So i'm trying to find a solution like 4S and 12/4,5 or 11/4,7. I studying with "drive calculator" but no one as putting into the program the dates for it. On other hand i did not find precise datas about 880Kv and 12/4,5 and 11/4,7 propellers too proceed with calculations.
May somebody help me ? BRGDS Olivier.