First build, long range intended I'm lost

[SundayPurge]

Hi, for some time I've been waiting to build a quadcopter aand the time has come with my final year project.
For now I have:
PixHawk 2.4.8
M8N GPS
433 MHz telemetry
cables and nothing more.
I need a quadcopter that for now will carry those mentioned above + an arduino/teensy with 2 sensors, the quad it's going to fly autonomously from point to point, and in the future I'm going to use it to film landscapes, trails etc. Basically, not much weight and I'd like as much flight time as possible.

What's the problem? I don't know what motors to chose, what ESCs, how many cells. I have somewhere around 125$ to spare for motors and ESC's on aliexpress. 7 hours ago I was about to order 2207 from EMax at 1700KV with 7" biblades props but a few hours on youtube lead me to the conclusion that the motors are too small for that prop size. What do you think?

 

[wafflejock]

Agree those motors are probably too small just going on the fact that everyone likes that size for 5" props and 7" props are 2" bigger

For flight times etc. suggest checking out ecalc.ch it's good for totally custom builds and to get some idea of flight time and thrust to weight etc. free version will let you pick out of a handful of parts so hopefully can find some close enough to get some numbers but maybe can email them about a educational license or something to get you on for a year for free (not sure just something to try). Budget for ESCs and motors is fine for a 5" build also can always do battery swap or go slightly bigger battery if it's doing autonomous stuff since not so worried about trying to punch out or do a power loop in that case . Can find budget motors on racedayquads or elsewhere for around $13 a pop (I wouldn't go cheaper), the ESCs should run you somewhere in the $40-60 range, frame is similar price usually around $50 is good enough around $100 is premium.