Difference between revisions of "Nighthawk250"

Revision as of 20:34, 2 August 2015

• Building a FPV Drone

Current setup

• Power calculator
• Frame: HobbyKing Spec Class 250fpv
• Motor: 4.4A max, 2-3s lipo, max 49W
• ESC: Afro 12A SimonK (2-4s lipo), BEC: 0.5A Linear 5.0v
• Props: Gemfan 5030
• FCU: CC3D Atom 4.8-15V 70mA
• Batteries
  • 11.1V 3S 1800mAh 20C
  • 11.1V 3S 1000mAh 20C
  • 11.1V 3S 2200mAh 30C
  • 14.8V 4S 1800mAh 25C (non usable with these motors)
• FPV
  • FPV Camera: 1/3 Sony CCD 7-13V (3S) current 70mA
  • FPV Transmitter: 7-24V 190mA manual -> FR1 CH8
  • Video Receiver: current 12V 200mA
• Video "goggles"
• Weight:
  • Theorical weight: ~415g
  • Calculated weight: 560g

Upgrade planning

• More powerfull motors !
  • DYS BE1806 2300KV http://www.banggood.com/DYS-BE1806-2300KV-Brushless-Motor-2-3S-for-Mini-Multicopters-p-933192.html
  • 18g 88.8W http://fpvracing.ch/en/motors/62-emax-mt1806-2280kv-cw.html
• better frame
  • expensive 150$ http://www.minihquad.com/frames/blackout-mini-h-quad/
  • cheap 20$-40$
    • fiber glass http://www.banggood.com/ZMR250-H250-250mm-Fiberglass-Mini-Quadcopter-Multicopter-Frame-Kit-p-933189.html
    • carbon http://www.banggood.com/H250-ZMR250-250mm-Carbon-Fiber-Mini-Quadcopter-Multicopter-Frame-Kit-p-933185.html
• Better FPV antennas, stock are shitty with Skyzone kit (according to comments on HK)

Assembly

Frame

• Basic assembly guide: https://www.youtube.com/watch?v=r8ALzUluyXM
• An other assembly guide: http://www.cardella.tk/2014/09/fpv250-quadcopter-build.html

Configure FCU: CC3D Atom

• Install OpenPilot GCS (install of openpilot fails but openpilotgcs is working) https://wiki.openpilot.org/display/WIKI/Downloading+and+Installing+the+Ground+Control+Station
• Hardware setup: https://wiki.openpilot.org/display/WIKI/CopterControl+-+CC3D+-+Atom+Hardware+Setup
• Full introduction to building a quad with the CC3D https://www.youtube.com/playlist?list=PLYsWjANuAm4r-E61stLchCR4bzY3NmDNh

Batteries

• https://www.reddit.com/r/Multicopter/wiki/power
• LiPo are dangerous! https://www.youtube.com/watch?v=YCWdnjLqVWw
• C rating : the higher, the higher current you can draw http://www.rcheliwiki.com/C_rating
  • C*Capacity in Ah=Current
  • Current: 20C * 2.2Ah = 44A
  • Power: 44A * 11.1V = 488.4W
• S is the number of cells in series, and is representing the tension (1S=3.7V, 2S=7.4, 3S=11.1V, ...). P is in parallel. Usually LiPo are in series and P=1
• Balancing: Cells need to be a the same charge level so we can avoid overcharging.
  • It's a good idea to always use the balance mode to charge a multiple cells battery
  • http://www.rcheliwiki.com/Balance_charger
  • Use the charger to check and rebalance cells https://www.youtube.com/watch?v=AChoy_PsVEg
  • A good trick to test is to charge the cells individually using the balance cable, it's much faster than the balance mode that needs to discharge overcharged cells a lot

Transmission

• Having some problems with the vTX right now, apparently at full throttle. Electrical perturbations ? Good, got some new antennas

Gallery

• 1st flight https://www.youtube.com/watch?v=RCSfAMZ6bm0
• FPV Camera setup https://www.youtube.com/watch?v=aNmkK1-EYYc

• 
• 
• 

  cabling is hard

• 

  1st build

• 

  fpv tests

• 

  stats

• 

  rebuilt everything, better antenna placement, battery cables, fix the feet, ...

• 

  Broken an arm trying to roll

• 

  Arm fixed using epoxy, flying well, we'll see if it handles vibrations and the next crash

See also

• Drone