Artem's Friends

  • Gyrobot
  • Todd
  • Mikhail
  • Julien Dubois
  • Nick
  • Forrest Frantz
  • Rolf Blomgren
  • Shyam Balasubramanian
  • Tommy Larsen
  • Simon Howroyd
  • Rob_Lefebvre
  • emile 'butch' alline
  • Matthias Badaire
  • Michael Oborne

Artem's Groups

Artem's Discussions

New power module proposition

Started this discussion. Last reply by Artem Mar 5. 7 Replies

Hi everyone! I would like to list two ideas (none novice or mine) which I hope will gain the attention of our community and result in 3dr introducing some new products and functions in the apm…Continue

Tags: halleffect, hall effect, voltage sensor, current sensor, 6s

MyFlyDream AAT and APM/Pixhawk

Started this discussion. Last reply by mP1 Feb 18. 2 Replies

Hi, I am seriously considering building an antenna tracker. However after some research and sourcing all the various parts/bits and pricing it all together I get a really "hacked-together" looking…Continue

APM Output Function

Started Dec 17, 2013 0 Replies

Hey, could someone point to me where can I find APM_RC library? Also, am I correct that this library includes functions which are used to control APM output? this is what I am trying to do:currently…Continue

noob question

Started this discussion. Last reply by Artem Nov 19, 2013. 6 Replies

Hi everyone, I've just finished building a tricopter, put an apm 2.6 with external mag/gps on a self made mast very far from any interference, but close to the CG my apm is directly on the CG. done…Continue

Tags: 2.6, apm

 

Artem's Page

Latest Activity

Artem commented on Chris Anderson's group ArduCopter User Group
"Question about pixhawk hardware: pixhawk logs vcc @ 5.13v, however its servo rail voltage measures 4.41v. I use 6s lipo, so I have a non 3DR power module and at first I though that the problem was with its BEC sagging under load, so I disconnected…"
Tuesday
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"That's what I told you, but they do seam to run hot, unless they are 2x max current, than they run moderately warm. BTW, are you using new slim spiders? "
Tuesday
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"I am wondering if this is 3.3v pwm having issues with some afros... "
Dec 12
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"xoltri, can you repeat your test, but hook ESC to a receiver supplied with 3.3v without any pixhawk involvement, also, can you open up that afro ESC and take a picture? "
Dec 12
Artem commented on Randy's blog post ArduCopter 3.2 Released
"Randy, one question,  did you guys changed anything in how AC reports voltage pack in 3.2? for some weird reason my telemetry shows wrong voltage values for a 6s lipo under 22v, however it logs the pack voltage just fine. Telemetry shows…"
Dec 10
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"If your motors draw 20A @6s and you want SK ESCs, go with at least double the amps. With simonk f/w 20A ESCs tend to run really hot even with max 17-18amp per motor current draw -tried 20a spiders, 20a multistars, Sunrise 20a all good ESCs which…"
Dec 10
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"That is why one needs to research both sides and use own experience + judgement. As stated multiple times in all my posts this is NOT pixhawk's fault but poor ESC quality. If it was pixhawks fault there would be signifucantly more people with…"
Dec 7
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"Spiders are awesome on the latest SK, but as with any SK 6s setup IMHO one needs at least double the amps of your motors. Otherwise they run hot. Xrotors are good, very good, not as good as spiders, but they run cool even between the frameplates. If…"
Dec 7
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"Craig, this is exactly what I saw when I was "researching" this issue, but showing that pixhawks pwm is almost identical to other RXes pwm doesn't prove much except implies that those ESCs which have issue with pixhawks should have…"
Dec 5
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"Again, as mentioned, i think it is both 3.3v pwm and QC of some of ESCs! Reading back few posts I mentioned that I had 2 afro 30a on the same SK verison one would loose sync one would work fine. And as seen in the xoltry's video he doesn't…"
Dec 5
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"Not really, it means that I read both for and con arguments and made an informed decision based on the info I was able find about this issue. After all there is plenty of info suggesting that 3.3v pwm can be the issue and I still could not find an…"
Dec 5
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"lol, under research I mean "forum research". "
Dec 5
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"but again, it is very sporadic, as I mentioned I had 2 30a afros both from HK on the same SK version, one would loose sync one would not. in this case it is more of the QC problem with afros than a 3rd issue. I personally torture test each and every…"
Dec 5
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"admit, 3dr is not the best cs company. an they should definitely address this incompatibility at least as a good will measure. "
Dec 5
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"Been using pixhawk/clones since August on various setups ranging from 3s to 6s, 8"props to 17" props, 340kv, 380kv,  400kv, 700kv, 750kv, 980kv without problems. ESCs afro 30a, afro 20a slim, ZTW spiders 20A, 40A, HW xRotor 40a.…"
Dec 5
Artem replied to xoltri's discussion Pixhawk causing motor sync issues.
"Sync loss is not pixhawk problem, but esc/motor issue. out of my experienceif an ESC / motor combo passes at bench test  for sync loss pixhaw will never be an issue as long as all grounds are connected. Update your ESCs f/w this should solve…"
Dec 5

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Comment Wall (3 comments)

At 6:05pm on January 29, 2014,
MR60
Forrest Frantz
said…

What is your budget?

At 6:14pm on January 29, 2014, Artem said…

this is going to be for my "dream tricopter"  and thus I will be making some saving for this purpose, so if it is under 100usd than I think I could afford them....  so far I found NX-4006-530kv motors 67g 481g @ 3.35amp theoretically 

At 6:16pm on January 29, 2014,
MR60
Forrest Frantz
said…

Also, can I phrase the question as such:

Is there a rotor (motor and prop) that generates more than 430 grams of net thrust (500 grams less motor weight of 70 grams; thrust after the weight of the rotor is removed along with the additional weight of 2 grams per inch of prop over 10"), while sipping 43 watts or less (3 amps at a 4S voltage that varies between 10 and 17 volts)?  In other words, a rotor with an efficiency of about 10 grams per watt at 430 grams of net thrust.

Is it OK to word the question that way?  If so, then a 130 gram rotor generating 560 grams thrust at 43 watts would be OK as would a 50 gram rotor generating 480 grams of thrust at 43 watts.

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