Replies to This Discussion

Permalink Reply by Olivier Fontaine on July 18, 2012 at 4:54am

This's the E-calc for hight altitude flight project.

I hope that AEOLIAN motors are those solded for 3DR.

This is the only one with same specifications.

Best regards Olivier

Attachments:

• xcopterCalc 4S 6000mAh.pdf, 238 KB

Permalink Reply by x-air71 on July 19, 2012 at 10:54pm

Hi Olivier,

Torino....sei italiano?? direi forse francese...Anyway, I guess you could need to change also the propellers...you will need more thrust, i will suggest you to use more powerful engines with at least 12x4.5 props.

I have en hexa with which I'm planning to take aerial pictures...and I will have an additional 800 grams payload (2 cameras, 1 rgb and one nir). I have engine 880 kv and 12x4.5 props, plus 2x3300 mha 3s lipos.

Change your engines with bigger ones and use 12x4,5 (30A esc)

Which kind of sensors are you using?

 

Ciao

Marco

 

Permalink Reply by Project Nadar on July 28, 2012 at 1:26pm

Marco,

 

What do you use the NIR camera for? Sounds very interesting project.

Permalink Reply by x-air71 on July 29, 2012 at 1:27am

Hi, it is for precision farming stuff....ndvi maps, water stress & co

but the difficult part is to have a stable flight....and trustable...

today RTL and aotulanding trial -> 3 broken propelers, one arm damaged...

I'm updating the project here https://plus.google.com/u/0/116109270317073149874/posts

hopefully in september I will be able to have some results

Ciao

Permalink Reply by Aaron Curtis on July 22, 2012 at 9:52am

Hi Olivier,

I am also testing ArduCopter quads at high altitudes. I have flown the original ArduCopter 1.0 (before 3DR made a frame) and had good success with it on Mt Erebus, where the air pressure was about 650 kPa. See http://youtu.be/JYHDX6IE9-A and http://youtu.be/e9YYZ0SWWWI . It handled quite well with no modifications to the code or PID values.

Recently I flew an xaircraft 850v frame, esc, and motors controlled by an APM2 board at 12,300ft in Ecuador: http://youtu.be/ADZA-znfQ3c . I found it more difficult to control in the air -- it was not unmanageable, but the response was sluggish and it flew "drunken." Probably could have turned up the P values.

I have spoken with people who advise me that for efficiency in thin air, we should be using relatively higher pitch propellers and that idea makes sense to me. I have not tried this, but would like to.

Aaron

DeveloperPermalink Reply by Randy on July 22, 2012 at 6:44pm

@Aaron,

     Love your volcano copter!  I've shown your videos to a few people as an example of people flying in very cold conditions.

Permalink Reply by Olivier Fontaine on July 23, 2012 at 1:50am

Hi Aaron,

Waouh, It encourages me to proceed. This also shows that i have probably an other unknown problem that causes my lift problems...

What about cold temperatures and batteries charge?

May you give me more specifications ? Propellers? ESC? Motor? Battery? 3S/4S ?

There's a link for atmosphere datas (ISA 1976 International Standard Atmosphere) http://www.digitaldutch.com/atmoscalc/ you will see, and may calculating, that air density is coming down with altitude and temperature > that mean that lift force of propellers also and by consequence maneuverability...

Who know if next summer i can succeed the Mont Blanc 5000m

Any way keep me in the loop, please ;-)

BRGDS Olivier

Permalink Reply by Helge on July 23, 2012 at 4:53pm

Hi Oliver.

I find this very helpful to play around with. http://www.ecalc.ch/xcoptercalc_e.htm

You can change motors props and batteries untill you find a solution.

Helge

Permalink Reply by Olivier Fontaine on July 24, 2012 at 3:31am

Hi Helge thanks for your suggestion,

I already know this link but our precise specifications for 850Kv/880Kv and our propellers are missing. It give an idea witch is helping. My next step will be to experiment directly on site with different material ;-)

BRGDS Olivier.

Permalink Reply by Rostislav Kolotov on July 29, 2012 at 2:48am

Oliver I'm not an expert in any coptersbut let me put my 2c. Thrust is directly proportional to mass of air your prop is moving , since density is only .83 from sea level, they moving less air with the same speed of props which is limited by your motors kV. So to get same level of thust you can you need to move more air by volume to achive same mass air flow :1 Get props with wider blade 2 get longer props. 3. Increase batery voltage (dont forget to check Amps with power meter).. 4 Change motors to higher kV (same Ws) or get even more powerfull motors. 

Sorry if my English is not perfect.My second language.

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