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need advice on selecting motors, frame and battery

#1
hi everyone ,
I am new to this forum and need advice on selecting the best (efficient) motors for a small payload lifting quad-copter, payload is from 400-500 gm,
here's what I selected as a newbie
Emax RC2205S with ESCs
PixHawk flight contoller
foxeer FPV camera
1.3GHz VTx (haven't selected brand yet)

I need some help in whether the above mentioned parts can do my job? carry 400-500 gm payload and fly for about 15 minutes?
what capacity battery I need?
also please recommend a GPS+glonass for PixHawk.
and what size of frame will be feasible to attach a servo mount underneath the quad-copter.
 

PsyBorg

Wake up! Time to fly!
Mentor
#2
I am not familiar with big AP style builds but I am familiar with FPV and its a bad idea to use a Video system with a frequency lower then your radio system. Lower frequency = bigger wavelength= more power needed= overrides control system and you crash or lose your gear.

I would suspect you would be looking at ~400mm frame, lower kv motors and larger props for the efficiency and lifting capabilities. Stay tuned and be patient someone good with maths will chime in soon and post numbers, links, and Websters level descriptions for everything. :p
 

Fidget

Active member
#3
For your battery capacity and flight time, your best bet will be to find another similar pre-built quad and use what they used, or calculate it out in eCalc: https://www.ecalc.ch/xcoptercalc.php The calculator in the link is specifically for multi-rotors.

PixHawk is a good flight controller, especially if you want to use GPS. The newest version is 2.1, and the old (~$60) version is 2.4. (I spent a couple hours figuring that out the other day.) There are many more options for controllers if you choose to use Betaflight. Painless 360 did a video about combining those two: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwi-4pjksLXYAhUp44MKHbmEDb0QtwIIKDAA&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D8FIi_xuH4Vo&usg=AOvVaw0-rEuZB4fxIwuX-hBhaqCI

To be fair, I've never built a GPS quad.

I would guess that you'll want a 400mm or larger quad, so you may end up wanting a larger prop/lower kV motor setup than the 2205s. 15 minute flight times are beyond what most home-built quads are capable of.
The FT270 advertises flight times close to that, and it designed to carry a gimbal on top, so you might start there. https://store.flitetest.com/ft270-chase-quad-frame/

You will need a Technician Class HAM radio license to run a 1.3 video system, and really almost all FPV setups. I'm signed up to take my test in a couple of weeks. The link to how to get the training and testing is here: http://www.arrl.org/getting-licensed
Whether you use 1.3 or 5.8 or other frequency will have to do with your goals in terms of range. Alex Greve has a good intro video series here: https://www.youtube.com/watch?v=1dZfovzdSrM&list=PLQfofxd5B8YWAmCMOf03_AGQfRlJJ_iTo