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John Arne Birkeland
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  • Norway
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John Arne Birkeland's Groups

John Arne Birkeland's Discussions

Problem maintaining pitch when accelerating / decelerating.

Started this discussion. Last reply by Michael Zaffuto Jul 2, 2010. 29 Replies

Servo problem with the new red (328) cards?

Started this discussion. Last reply by Chris Anderson May 3, 2009. 22 Replies

 

John Arne Birkeland's Page

Latest Activity


Developer
John Arne Birkeland commented on F. C. Bearsch "Tearig"'s blog post A Microsoft Vision of the Future...
"Breaking physics doing high-speed wireless transmissions underwater, and being online without a single ad showing. This is indeed far into the future.."
4 hours ago

Developer
John Arne Birkeland replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"The effect is very similar to how a brushless camera gimbal works. The gimbal motors are fast but have have very little torque, so even if the CG is just slightly off they are unable to stabilize out all movements. The same goes for multicopters.…"
Tuesday

Developer
John Arne Birkeland replied to Chris Mitchell's discussion Can quadcopter motors be mounted upside down ?
"As far as I know there is no "broomstick" or pendulum to exploit in multicopters. The shortest answer that I have found, is that since multicopters are inherently unstably, the most efficient CG is a neutral one. In other words it takes…"
Monday

Developer
John Arne Birkeland commented on Rob_Lefebvre's blog post Iris/Pixhawk Cold Weather Testing
"The normal precautions for flying in cold weather is to make sure the LiPo are kept above freezing temperature, since it may degrade the battery chemical reaction. Usually I just keep them close to my body before flying. Once you are up in the air,…"
Feb 19

Developer
John Arne Birkeland commented on Katrina Rosen's blog post Nice article in Gizmag reporting on Krossblade's SkyProwler
"Airplanes "aka planks" have some inherent advantages when it comes to efficiency and speed leading to longer flight duration and distance. But there is also a reason why most commercial (and military) long duration drones have huge wing…"
Feb 19
Sandy Sound commented on John Arne Birkeland's blog post Adam Savage Project - Flying multirotors
"He talks about putting up links to his check list... Anybody found them?"
Feb 13

Developer
John Arne Birkeland commented on Greg Dronsky's blog post 3D printed DJI Ispired clone
"I'll say it again. The Inspire looks cool and very sci-fi, and sells like hotcakes because of it. You'll get no argument from me there. But it is functionally flawed since the design puts movable parts at the frame joint where strength and…"
Feb 13

Developer
John Arne Birkeland posted a blog post

Adam Savage Project - Flying multirotors

Adam Savage talks about being new to multicopters and his view on safety regards.See More
Feb 12

Developer
John Arne Birkeland commented on Katrina Rosen's blog post Waiter drones in Singapore
"Successful marketing strategy to generate publicity: +10 Practical application value of said solution: ~0.01, rounded down to ZERO"
Feb 11

Developer
John Arne Birkeland replied to Justinclouds's discussion Low cost, high endurance, disposable fixed wing platform
"As mentioned before all the specification except duration are probably doable. To give you idea just how demanding 20h duration is, the standard MQ-9 Reaper (aka. Predator B) using an efficient turboprop motor and a 20m wingspan, is still limited to…"
Feb 9

Developer
John Arne Birkeland commented on Chris Anderson's blog post Wired: "Why the US Government Is Terrified of Hobbyist Drones"
"There is no way to shape the explosion when using a UAS, and the payload is very limited. In addition access to high yield explosives that might have compensated for the limited payload, are highly restricted. This is why pretty much all terrorist…"
Feb 7

Developer
John Arne Birkeland replied to Joe's discussion Futaba or Spektrum?
"I am a Futaba guy, but a better option today in that price range would be the FrSky Taranis X9D. http://www.hobbyking.com/hobbyking/store/__45026__FrSky_2_4GHz_ACCST_TARANIS_X9D_Digital_Telemetry_Radio_System_Mode_2_.html It's a no brainer…"
Feb 4

Developer
John Arne Birkeland commented on Franc's blog post Ground station, mission planner redesigned
"I applaud the effort since there is much room for improvement in the current generation of GCS software. But at the same time be careful that you don't fall into the typical designer trap where aesthetics become more important then…"
Feb 4

Developer
John Arne Birkeland commented on Thomas J Coyle III's blog post Secret Service: Drone that crashed on White House grounds was being used recreationally
"Stupid is as stupid does.."
Jan 26

Developer
John Arne Birkeland replied to Anna Tian's discussion Best open source autopilots v.s. commercial autopilots for conventional fixed wing unmanned aircraft usage
"I totally agree with you Gustav if you only look at the technical aspect and cost of hardware. But when it comes to military applications, then cost of actual hardware is a very small part of the total cost. The big ones are certifications,…"
Jan 25

Developer
John Arne Birkeland commented on Greg Dronsky's blog post DJI confirmed an issue with the Inspire's firmware...
"I read about this on RCGroups, and the bug is a lean (bad IMU offset) at takeoff. And as told by another person who experienced the same bug, it just required a little opposite stick to prevent it from flying away. But I guess that is to much to ask…"
Jan 23

John Arne Birkeland's Blog

Another multicopter crash into a crowd..

Posted on September 17, 2013 at 3:45pm 41 Comments

So it happened again, and it will continue to happen until people realize this technology is far from mature enough to be used for such tasks.

Aside from endangering peoples lives, the public opinion created from such incidents will be very damaging and contribute to overly restrictive UAV laws in…

Continue

Two-Stage Copter

Posted on December 28, 2012 at 7:00pm 10 Comments

This video was just posted by EndOfDays, a well known figure in the photo/video multicopter scene.

And for the record, let me just say that some people have WAY to much free time. :)

ZeroUAV YS-X4 teardown

Posted on December 25, 2012 at 4:30pm 9 Comments

So no completely trusting that Santa had gotten the message, I made sure that there at least was one present under the tree that I would like.

The YS-X4 is the latest multi-rotor autopilot from ZeroUAV, and their entry into the…

Continue

Teensy 3.0

Posted on October 11, 2012 at 2:17am 15 Comments

Just a heads-up that Teensy my favorite small form factor Arduino compatible board, just got a solid upgrade with the…

Continue

Comment Wall (7 comments)

At 3:30am on April 17, 2011, thomas marschall said…
Hei

Fant deg her på diydrones og tipper du har arducopter? Jeg prøver å kartlegge antall piloter i Norge for
å skrive en artikkel om dette.

Også skal vi i løpet av året organisere en arducopter / uav dag og du er kanskje interessert?
--

Vennlig hilsen / with regards

Thomas Bjørn Marschall

At 3:31am on April 17, 2011, thomas marschall said…
Hei

Fant deg her på diydrones og ser du kanskje har arducopter? Jeg prøver å kartlegge antall piloter i Norge for
å skrive en artikkel om dette.

Også skal vi i løpet av året organisere en arducopter / uav dag og du er kanskje interessert?
--

Vennlig hilsen / with regards

Thomas Bjørn Marschall
At 6:31pm on April 17, 2011,
Developer
John Arne Birkeland
said…
Heisann. Har vel strengt tatt ikke et arducopter da jeg liker å bygge mest mulig selv, men flyr quad mm. ja. :) Noe samling høres moro ut.
At 9:30pm on September 1, 2011, Ravi said…

Hi john, i am able to get PPM output from a PIN of Thomas Scherrer 12 channel receiver. is the PPM sum signal compatible with the ATmega2560 PPM decoder or i have to decode it through a interface. actually i am more of an aircraft engineer and less of a electronic engineer. the signal is coming from a Futaba 7C Tx onto a 12 channel thomas Sherrer Rx on 12 channel pin. can i give it directly to PIN 1 of APM after shortening PIN 2 &3 or i have to use an interface using PPMencoder. please help. i am currently using APM2.23. thanx, ravi

At 3:43am on September 2, 2011, Ravi said…

Hi john, i tried giving PPM to channel 1 PIN of APM and shortend PIN 2 & 3. did not work. I am not getting PWM out to servoes. Thomas Scherrer Rx takes PPM pulse from Futaba 7C Radio. It has a UHF RF Module which has been connected to the PPM out of Futaba 7C, this drives a 12 channel Rx also designed by Thomas Scharrer. I think the PPM pulse form futaba 7C should pass on as it is to the Thomas Scharre Rx which has a PIN for direct PPM out? what should i do next.

At 7:33am on August 18, 2012, Adam Scriven said…

Hey John!

Do you have any updates on Crawler1? What do you think of the Redcat Rockslide 1/8th? How does it hold up to your use/abuse? One of the things about the RS is that the only place making after-market parts for it seems to be RedCat itself, not many 3rd party manufacturers. Has that been a problem?

Thanks for any updates you can provide! ;)

At 8:33am on April 15, 2013, baufay patrick said…

Mister.
I seek information for zero ys-x4 wiffi
you to be able to help me if me question poses has you
I thank you for answer
I am of Belgium
patrick.baufay@skynet.be

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