Motors


Michael Zafirov
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From what I found that starting with what your weight of quad and the payload . There are helpful sites out there.

Keep in mind it boils down to  how much thrust your going to need to lift and how your going to lift it. Example heavy camera package slow and steady lift. Another is building a racer or 3D Qaudcopter.

The battery, ESC, motor, prop "number of blades,size, and pitch" Any changes can snowball to bad performance and efficiency.

Some sites that would help.

https://oscarliang.com/quadcopter-motor-propeller/

http://www.dronetrest.com/t/how-to-choose-your-multi-rotor-motors-props-esc/211

http://www.hobbyking.com/hobbyking/forum/forum_posts.asp?TID=38561

 

Better yet here is a nice site for multicoper calculator. Just punch in your values. I have used this when selecting upgraded motors and ESCs.

http://www.ecalc.ch/xcoptercalc.php?ecalc&lang=en

The main site http://www.ecalc.ch/index.htm to pick out your own calculator.

 

Edited by olesailor
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  • 2 months later...

I do not know if it will interest you all, but I am an aficionado of the Emax CF2822 (the little red motor). On all the multirotors which I designed, built, flown and still flying (fingers cross, lol) I used this little power plant, which I find remarkably strong, resilient and reliable.

The only problem I found and now resolved, is the small shaft, which is not the best on multirotors. Propeller adapters are notoriously unbalanced, often cumbersome and fairly useless on such a long shaft. Even cutting the shaft does not completely solve the problems that vibrations generate.

So I decided to do something about it and a few hours of work at th lathe (may be more than a few, lol) gave some nice results. I made aluminium alloy adapters which have a good fit onto the shafts and so are super-glued to it. Now the APC 9" x 4.5" are happily sitting on the top of the motors. Having tested for vibrations, I found that 90% of them were gone and itis nearly impossible to feel them on the craft. The following photos are quite clear.

APC 9 x 4.5 on motor.jpg

Propeller adapter on motor.jpg

Propeller adapter side view.jpg

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@Bruno I am a big fan of Emax motors. I believe that they are reasonably priced for the quality. I have the 2213 on my quad and I am considering the 2216 (810kv) cooling version for my new hex build. The shafts are already threaded similar to your adapter that you made and there is a reverse thread/nut so the prop does not loosen when rotating in the CCW direction.

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I  had a look and they seem to be very nice motors, but they do not reach the efficiency of the CF2822 and are much heavier. A friend of mine uses the 2216 on his quadcopter and is telling me that the motor, with its wires and prop adapter, weighs a little more than 100 grams. The maximum thrust is 950 grams with a 4S. When you compare this to the 45 grams of the CF2822 (including wires and adapter), which developes a maximum thrust of 830 grams with a 10" x 3.8" propeller and a 3S, you can see what I mean. The CF2822 is as well using 20Amps ESCs, which only weigh 20 grams each.

I am just thinking about the restriction in weight that have recently been applied: 2000 is the maximum AUW (MTOW) allowed for unlicensed drone pilots. There is also to consider that the heavier craft requires a much heavier battery to achieve a reasonable flying time.

On the positive side, The 2213 and 2216 are "pret a porter" and do not require any additional work, which is a bonus.
The only thing to decide seems to me to be if it is a good idea to start building an hexacopter with 800 grams between motors and ESCs, plus 450-500 grams of li-po battery.... then add the frame, the FC, the receiver, the camera, the gimbal....

I just add a photo of one of my V hexacopters with gimbal and camera (Xiaomi Yi). In this one I am using a 4000mAh 3S lipo for the motors and a 800mAh 3S little one for the gimbaI. The motors are CF2822 with 30 Amps Simonk ESCs and 9" three blade propellers. For the frame I use FatBoy archery arrows (23/64" in diameter, 7075 alloy) which weigh far less than carbon tube, are stronger, more resilient and do not interfere with RF signals, without mentioning the price ($4 each). The AUW is 1450 grams and the flying time is 10-12 minutes, depending on the wind, the pilot's skill etc.

I hope this will help. Let me know what you think.

Cheers from Bruno

V hexacopter with gimbal.jpg

Edited by Bruno
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Today I tested my just finished disassemblable V6 Hexacopter for the first time, as usual in my kitchen because outside it is blowing a gale. The result is rather good:

https://www.youtube.com/watch?v=7t37Pru07wU&feature=youtu.be

As one can see, I made my own vibration dampers, which support the whole platform, making the FC, the gimbal and the camera very happy (lol).

Cheers from Bruno

Disassemblable V6 front damper.jpg

Disassemblable V6 front view.jpg

Disassemblable V6 side view.jpg

Edited by Bruno
adding text
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