My First Build

Hi guys, I'm new to multirotor flight and have decided to build a quadcopter. I have done plenty of research on my own and believe I have a working design, but I would appreciate some confirmation before I go out and spend the money.

Flight Control Board:
- Hobbyking KK2.1.5 Multi-rotor LCD Flight Control Board
http://www.hobbyking.com/hobbyking/...th_6050MPU_And_Atmel_644PA_US_Warehouse_.html

Battery:
- 2x Multistar High Capacity 3S 4000mAh connected in parallel
http://hobbyking.com/hobbyking/stor...0mAh_Multi_Rotor_Lipo_Pack_AR_Warehouse_.html

ESCs:
- 4x Turnigy Multistar 20A V2 (has BEC connector)
http://www.hobbyking.com/hobbyking/...im_BLHeli_Multi_Rotor_Brushless_ESC_2_6S.html

Motors:
- 4x Turnigy Multistar 2216-800Kv
http://hobbyking.com/hobbyking/stor...16_800Kv_14Pole_Multi_Rotor_Outrunner_V2.html

Transmitter/Receiver:
- Turnigy 9X 9Ch Transmitter w/ Module & 8ch Receiver (might just go with the 6 channel model)
http://www.hobbyking.com/hobbyking/..._Module_8ch_Receiver_Mode_1_v2_Firmware_.html

Structural parts are a carbon fiber frame, 10" props w/ guards, wiring, and a series of mounts and screws.

However, I'm more concerned about the electronics. I have attached a picture that shows my current understanding of the wiring. Thank you in advance for any assistance you can provide.

schematic3.jpg

Ah, exactly why we do these things. You want to aim for ~50% throttle at hoover, a little over is not bad... I'd be nervous with it that high.

I also think you're optimistic on the weight. I'd assume the frame weights 500g and add 200g for misc stuff. If you use this 700g weight and set it to [not inc drive], it will add the weight of your other components to your total. This brings you to a total weight of 1880g and produces a notice that you don't have enough power to fly. If you plan on adding a payload (say camera and gimbal) that should be added as well.

The most obvious heavy thing you're carrying is the batteries (650g). Lets drop one and see what happens... good news, you can now fly but at a rather high throttle setting and rather low hoover time of 9min.

If you keep both batteries, but increase you propellers to 12" then again you're in the air.

If you switch to a single 4S 4000mAh batter and 12" props you'd also fly, but don't do so at full throttle for long periods of time to avoid overheating the motors.

Experiment and see what compromises you are ok with. eCalc isn't perfect, but it will give you a good estimate of how your components will work together.

Notes:

Larger propellers are generally more efficient than small ones
800kV is borderline low for a 3S battery (you will notice that most copters running 3S and 10" props are using ~980kV motors). This is not a problem if you want to want to run larger propellers.
Weight is king, anything you do to reduce weight will help flight time a lot. They guys flying for 1hr+ spend a huge amount of time reducing weight.

Replies

Jason McCarthy July 22, 2015 at 1:25pm

I would also upgrade to a flight controller running APM software so this site can br of help.
- Liam Anderson > Jason McCarthy July 23, 2015 at 6:40pm
  
  Which site? How would that help?
Phillip Schmidt July 20, 2015 at 12:20pm

What does eCalc.ch show your hoover throttle % to be? What is your flight weight? That looks heavy with two batteries for 10" props and 200W motors, but that's just a hunch.
- Liam Anderson > Phillip Schmidt July 22, 2015 at 11:56am
  
  I took a screenshot of the results (partly estimated info):
  - Phillip Schmidt > Liam Anderson July 22, 2015 at 1:21pm
    
    Ah, exactly why we do these things. You want to aim for ~50% throttle at hoover, a little over is not bad... I'd be nervous with it that high.
    
    I also think you're optimistic on the weight. I'd assume the frame weights 500g and add 200g for misc stuff. If you use this 700g weight and set it to [not inc drive], it will add the weight of your other components to your total. This brings you to a total weight of 1880g and produces a notice that you don't have enough power to fly. If you plan on adding a payload (say camera and gimbal) that should be added as well.
    
    The most obvious heavy thing you're carrying is the batteries (650g). Lets drop one and see what happens... good news, you can now fly but at a rather high throttle setting and rather low hoover time of 9min.
    
    If you keep both batteries, but increase you propellers to 12" then again you're in the air.
    
    If you switch to a single 4S 4000mAh batter and 12" props you'd also fly, but don't do so at full throttle for long periods of time to avoid overheating the motors.
    
    Experiment and see what compromises you are ok with. eCalc isn't perfect, but it will give you a good estimate of how your components will work together.
    
    Notes:
    
    Larger propellers are generally more efficient than small ones
    
    800kV is borderline low for a 3S battery (you will notice that most copters running 3S and 10" props are using ~980kV motors). This is not a problem if you want to want to run larger propellers.
    
    Weight is king, anything you do to reduce weight will help flight time a lot. They guys flying for 1hr+ spend a huge amount of time reducing weight.
    - Liam Anderson > Phillip Schmidt July 22, 2015 at 2:17pm
      
      Thank you for your reply, I appreciate it. I'll make some changes to my design to produce some better numbers for throttle and hover time.

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