John Dennings
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  • Denver, CO
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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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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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