Aeronavics / Droidworx XM configuration

[Kolb]

Hi there

Almost ready to put in an order for a XM frame. I'll be setting it up with DJI Wookong-M. Still wondering if I should go for the 6 or 8 version. From what I can see is that XM6 flies very stable as well and is equally good in delivering more then decent AP footage and cheaper in the end. But I like the - be able to land with a broken motor - option you have with an octocopter. What is your feel on this?


I'll order the frame with a local supplier in Europe. The rests of the parts are a bit more difficult to find, I want to order in Europe.

- Motors:
Axi 2814/22 or T-Motors MN3510/25

- ESCs
Maytech 40amp SimonK or Dualsky 40amp

- Droidworx PDB

- XOAR 13" 6.5 props

I will fly with 6s lipos. Will this setup perform well? Any suggestions otherwise? Would highly appreciate the feedback of the community.

 

[Kolb]

I will probably go for Hobbywing 40A ESCs. I've read good reviews about it and they are cheaper.
I was wondering as well, I'll be soldering my motors on to my ESCs, without any connectors, to make it more fail proof. But how do I determine motor rotation before soldering?

 

[Kolb]

Hi Everybody

Will give you a quick overview of my finale shopping list to go with the XM8 frame.

- Hobbywing 40A OPTO ESCs
- Droidworx PDB
- Xoar 13x6,5 props

Nothing to special.

I am getting more and more confused when it comes to motors. I know the Axi 2814/22 are top notch. But still very expensive.
Thus, looking for cheaper variants. Can someone be so kind to give me some input on the following list?

- Torxpower 3536
- Avrotor 2814
- Tiger 2814
- Pulso 2814/22
- Altigator A3536

Will these fit on the XM8 non-Titanium frame? Which - maybe some different - motors would you recommend instead of the Axi 2814/22. What should I be looking out to?

Next to my motor issues I am still debating 4s, 5s or 6s setup. I am looking in running a parallel setup and want at least 10 minutes flight time. My ESCs support up to 6s lipos, depending on the motors, what would be the wisest decision?

Thanks for any input, I know these are very basic questions to the longtime multirotor specialists you guys all are, but I really appreciate some personal feedback on all my questions.

 

[Lanzar]

Hello,

Well i would go with

xmr x4
kw9 motors or tiger eqivalent ones
some good 40 amp esc, tiger ones if tigers are used.
15x5 or 16x5 inch tiger props.
6s setup

Best option.

 

[Razzil]

Since firmware update 5.14 for the Wookong-M ... you can lose one motor or prop and recover, as you would with the Octo. Pretty sure.
I'd go with the XM6 unless your planning on lifting a heavy payload or a huge camera.

 

[Kolb]

Lanzar, thanks for your input. Coaxial setups look really nice. Thanks for sharing that setup.

Razzil, didn't knew that! Important information. I just got a good deal on the XM8 - so I am gonna stick with that one.

 

[Razzil]

Here's the video

 

[Kolb]

I just put everything in ecalc, not sure if that was a good idea... Can someone help me to interpret?

XM8, 40A Hobbywing, MT2814/10, APC 13x6.5, 2x4S 5000mAh - I estimate the weight of the frame to be around 2500grams (frame and landing gear).

- Weight of batteries - is this for each?
- # blades?
- 3 minutes mixed flight time is really low...
- Optimum efficiency, what is the target?
- Throttle at 71% is too high, I need this to be around 50%
- All up weight seems high as well.

What is wrong? I am really concerned about flight time, I was really hoping this to be around 10 minutes. I do know ecalc is not always right, but the numbers seem to be a bit off, no?

 

[nicwilke]

MT2814-10 don't go for 13x6.5, don't go past 12's. Try 12x5's or 12x4.5's.
I use these motors.

 

[Kolb]

Hi Nicwilke,

Appreciate your feedback! Any reason why not to go for the 13x6.5? Performance wise?
If I change the variables in eCalc with your suggested props my linear throttle is around 90%, way too high. Or should I just disregard eCalc ?

 

[Kolb]

Back again, it seems that eCalc takes the battery weight and multiplies it by 8 motors as well, that is why my battery weight was above 4kg's. Adjusted that, together with nicwilke' suggestion of using 12" props and that seems to be the way to go.

Still a little bit concerned about my flight time, but there isn't much more I can do. Right?

 

[nicwilke]

Hi Nicwilke,

Appreciate your feedback! Any reason why not to go for the 13x6.5? Performance wise?
If I change the variables in eCalc with your suggested props my linear throttle is around 90%, way too high. Or should I just disregard eCalc ?

Look at the green line. Too hot.

What is your estimated AUW? Including batteries.

 

[Kolb]

Ok - I see... Makes all sense now.

Estimated AUW would be 5 to 6.5kg.

Here is the chart with the 12x4.5 props. I'll go with these.

 

[nicwilke]

Have you got the motors yet? Look at the MT2814-10 (710kv), they are the same motors but wound different for the lower kV. Those would allow you to spin 13x4.5's and get a 9min hover at 5.5kg.

I think the 770kv motors are great all round. They spin faster and can work better with some of the better FC's

Ok - I see... Makes all sense now.

Estimated AUW would be 5 to 6.5kg.

Here is the chart with the 12x4.5 props. I'll go with these.

Sent from my GT-I9305T using Tapatalk 2

 

[Kolb]

I am building this config right now.

The MT2814/10 motors are a very very tight fit on the engine mount disk. In fact it does not fit, I have to squeeze the motor in place. This causes my 30mm head cap screw to bend a little bit, thus making it very hard to put the engine mount brackets in place. I finished one bracket but have no idea how I can ever remove it again.

Has anyone encountered the same thing? Any suggestions on this issue?

A photo is more clearer, you can see that I can't acces the hex screw on top. The other photo shows how bend the screws are.

 

[nicwilke]

Kolb,
Same with my XM6. Go to the hardware store, and get replacement M3 screw heads, they are lower profile. Mine would not fit. Replacement cost a few dollars.

 

[Kolb]

I'll just continue asking questions here. Could also be informative for the next guy.

I got me some replacement m3 with a conical head. Will try tomorrow, should be fine this way.

Searched a lot but I cannot find a manual for the Droidworx PDB, with specifics on how and where to mount. I guess I need some additional spacers as well?
I am planning on using LED strips, these are rated for 12v, Won't be a real issue I guess if I just solder these directly on my PDB? I am running 4s lipos.

 

[CdA D]

I will probably go for Hobbywing 40A ESCs. I've read good reviews about it and they are cheaper.
I was wondering as well, I'll be soldering my motors on to my ESCs, without any connectors, to make it more fail proof. But how do I determine motor rotation before soldering?

Motor rotation is determined by wire connection. Red-Red, Black-Black, Yellow-Yellow the motor rotates clockwise. Change anyone, just one, of the wires to a different one and the motor rotates counterclockwise. Red-Black, Black-Yellow, etc. I connected Red-Red, Black-Yellow & Yellow-Black.

 

[nicwilke]

I'll just continue asking questions here. Could also be informative for the next guy.

I got me some replacement m3 with a conical head. Will try tomorrow, should be fine this way.

Searched a lot but I cannot find a manual for the Droidworx PDB, with specifics on how and where to mount. I guess I need some additional spacers as well?
I am planning on using LED strips, these are rated for 12v, Won't be a real issue I guess if I just solder these directly on my PDB? I am running 4s lipos.

I'd suggest not running 12v LED lights on 4s, you will be too high with voltage. Try to get a 12v stepdown or BEC. The PDB sits on standoffs.
http://droidworx.co.nz/assets/PDB_mounting-021.pdfDroidworx PDB manual

 

[eyeball]

Hows the build coming along kolb? Do you have anymore photos of your pdb mounted with the esc's?