John Dennings
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  • Denver, CO
  • United States
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Interesting (Extreme?) autotune results ...

Started this discussion. Last reply by leonardthall Mar 23, 2015. 8 Replies

Never seen anything like…Continue

Code handling: X8 vs "Double X4"?

Started this discussion. Last reply by John Dennings Nov 24, 2013. 4 Replies

Can anyone comment on how the apm code handles X8 configurations? (Haven't delved into the code). More specifically, does AC 3.x send the exact same signal to the coax bottom and top motors on each…Continue

 

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Latest Activity

John Dennings replied to HighVoltage's discussion Price of industrial drones
"" For now, under the current regulations, all large scale commercial drone ventures are not economic viable.mainly it requires commercial pilot license to fly and can only fly line of sight." Those requirements are applicable for any…"
Mar 24, 2016
John Dennings replied to HighVoltage's discussion Price of industrial drones
"@HighVoltage: imho, Luc and Ausdroid make very good points. Given your response (you requirements, location, need for possibility of IR, possible map work etc ...) a Phantom won't cut  it, just not good enough  after sales…"
Mar 23, 2016
John Dennings commented on Katrina Rosen's blog post Drones to monitor wildlife
"Heavily dependent  on the species ...    ;) Phantom 3 get kidnapped by two eagles"
Mar 17, 2016
John Dennings commented on Katrina Rosen's blog post Drones to monitor rowdy spring breakers
"They don't need to be over the crowds to monitor them ..."
Mar 15, 2016
John Dennings commented on Sascha Helle's blog post New hexa- / octocopter carbon monocoque frames
"Two achilles heels in monocoques (and yes we do sell one, so we do know): Thermal build up and radio absorption. Yeah, I could see how what looks like the non CF top would be ok for GPS, but for RC, VTx and telemetry, antennas would somehow need to…"
Mar 15, 2016
John Dennings commented on Sascha Helle's blog post New hexa- / octocopter carbon monocoque frames
"Eye watering ... And the detachable  arms are a major plus ... Would be nice if you could provide English subtitles  in your youtube videos ...   ;) and more details on the arms/center plate electrical connections."
Mar 15, 2016
John Dennings replied to HighVoltage's discussion Price of industrial drones
"Very interesting indeed. The "RTK ready" mention alone is enticing, "available beginning 2016" ..."
Mar 15, 2016
John Dennings replied to HighVoltage's discussion Price of industrial drones
"Problem  is, no one can be sure. DJI launched Geo as beta on p3, word is it will be afirmware update on p4 but it's unclear how the final authorization will look like.  We'll know soon enough. This we do know: As far as…"
Mar 14, 2016
John Dennings replied to HighVoltage's discussion Price of industrial drones
"Looks like  copters with plastic arms and plastic landing gear. Calling them "the best multirotor by far"  or stating no one else is even close is one heck of a stretch, imho."
Mar 14, 2016
John Dennings commented on Andrew Tridgell's blog post Building, flying and not crashing a large OctaQuadPlane
"Very nice. Looks like moving from X4 to X8 was all win. Do you now see X8 configurations for this type of heavy plane  as your default, preferred choice? Also are the motors powerful enough that you could loose one and still be able to do…"
Mar 13, 2016
John Dennings replied to HighVoltage's discussion Price of industrial drones
"Good points worth considering. Ease of deployment (out of a backpack, done), inexpensive, small and light,  dead simple to operate, easier to get closer to inspected item (one way to make up for less camera resolution), those are important…"
Mar 13, 2016
John Dennings replied to Darius Jack's discussion Who is legally accountable in case of drone crash reported to FAA ? in the group ArduCopter User Group
"Reposting this pic from fsnoop just because: -  I can -  It cracked me up - It's even funnier than  "Pixhawk developers are legally accountable for bugs, flaws in code, algorithmics, avionics data processing", no small…"
Mar 13, 2016
John Dennings replied to Alireza Manzoori's discussion Uncontrolled Climbing (& CTUN.DAlt increase) in AUTO Mode, Keeps Climbing Even After Switching to LAND!
""Stabilize, AltHold, and Acro don't use GPS at all" They do. Although quite old, see this: https://groups.google.com/forum/#!searchin/drones-discuss/gps$20use$20flight$20mode/drones-discuss/iZmeopHOLGM/0XhYRUkVxZQJ"
Mar 12, 2016
John Dennings commented on Euan Ramsay's blog post Super cheap autonomous cargo "drone".
"Fun stuff and quite good performance  given "recycled parts" ... What did you mean by "telemetry useless beyond 40ft btw"?"
Mar 12, 2016
John Dennings commented on Stephen Dade's blog post CanberraUAV presentation to RAes
"Thanks for sharing. (I am such a sucker for those). Incredible accomplishments ..."
Mar 12, 2016
John Dennings commented on Andrew Ocejo's blog post Field Strippable, 300 sized, Multirotor Concept Release. STL files available for download for the Price of: FREE.
"Yes ... nothing to worry about.  If speeding tickets were an issue for security clearance, a very large number of people at the CIA, NSA, etc ...  would never have made it there."
Mar 12, 2016

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John Dennings's Blog

4 hour fuel cell powered quad

Posted on May 7, 2015 at 8:11pm 17 Comments

Singaporean company Horizon Unmanned Systems (HUS) unveils HYCOPTER, the world’s first hydrogen fuel cell powered multi-rotor UAV. HYCOPTER is being readied for a record flight endurance of 4 hours, or around 8 to 10 times the average flight duration of equivalent systems today ...…

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Comment Wall (3 comments)

At 2:01pm on October 17, 2014, Winfried Rijssenbeek said…

Thanks John, good and positive thinking is what we need! Best Winfried

At 8:18pm on March 19, 2015, Dan Wilson said…

Hi John,

I don't know a lot about the repeater but yes it does repeat Glonass as well. The only problem we have had has been the gain being too high which has hidden problems with interference, then when we take the systems to the field, GPS suddenly performs very poorly. Hope this help.

At 12:10pm on June 29, 2015, Winfried Rijssenbeek said…

We have done all studies and tests before we did the craft. Indeed it performs as anticipated. We have ca 6.7 kWh of battery capacity to lift it 10 min. We need a range extender: now there are many options: ideal would be fuelcel, but not sufficient power/kg ratio yet. This is only a Proof of Concept, as of now will start real prof stuff!

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