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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 Applied Aeronautics's blog post The Albatross UAV - Ready to Launch
"Very, very nice.."
Mar 14

Developer
John Arne Birkeland commented on Chris Anderson's blog post Next Outback Challenge will have medical theme, be harder
"Actually, a helicopter may have the safest kill switch option of them all. A multicopter would most likely have to be bigger and heavier then a copter to get the reach, and would fall like a brick when the motors are killed. The large airplanes…"
Mar 12

Developer
John Arne Birkeland commented on Chris Anderson's blog post How much damage would a small drone do to a jet engine?
"Common sense is sadly not all that common for some people.."
Mar 12

Developer
John Arne Birkeland commented on Chris Anderson's blog post Next Outback Challenge will have medical theme, be harder
"Depending on how the task rules are formulated, why not have the helicopter pick up the package from the ground directly? No need for a human close to the UAS and associated risks."
Mar 10

Developer
John Arne Birkeland commented on Chris Anderson's blog post Next Outback Challenge will have medical theme, be harder
"I have to agree with Rob here. As the challenge stands now, a nice 90 size gasser helicopter  is the obvious choice. When you get into the larger sizes there is a lot of lift in forward flight. Not quite airplane efficiency, but MUCH better…"
Mar 10

Developer
John Arne Birkeland replied to ausdroid's discussion Multistar 10000 blowing chargers
"HK products have great prices, but ZERO quality assurance. It's the price you pay for such low prices. If there is a bad production batch, it is always discovered after the fact when users start complaining. So my guess is that you bought the…"
Mar 7

Developer
John Arne Birkeland commented on David Barclay's blog post Vulcan UAV Frames from CreativeFlyers
"Mike, don't get me started on the S800 again.. That product single-handedly made me swear to stay away from any DJI products as much as possible. And unlike some, I don't forget the moment a new shiny toy is released. But yes, the gimbals…"
Mar 6

Developer
John Arne Birkeland commented on David Barclay's blog post Vulcan UAV Frames from CreativeFlyers
"The advantage with raised arms is that you don't need landing gear. As long as you don't plan on mounting a camera beneath that is. I did some experiment using this principle for a fixed camera FPV platform. The Z arms profiles are…"
Mar 6

Developer
John Arne Birkeland commented on Ascent AeroSystems's blog post Help requested! Comments and input needed for new coaxial UAS
"Looks like a great start and a good way to start a kickstarter with an actual working solution beforehand. My suggestion would be to be very upfront about any limitations. Like flight times, weather and wind limitations etc. To many projects only…"
Mar 6

Developer
John Arne Birkeland commented on David Barclay's blog post Vulcan UAV Frames from CreativeFlyers
"When you are lifting $$$$ of camera equipment on a paid job that will be worthless if there is any vibrations in the video, then suddenly a $500+ frame makes a lot of sense."
Mar 4

Developer
John Arne Birkeland commented on Chris Anderson's blog post Newspaper: "We must ban drones outright before it's too late"
"So.... I guess the story is that even old established news outlets have started doing click bait articles on current hot topics now?"
Mar 1

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.."
Feb 28

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.…"
Feb 24

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…"
Feb 22

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

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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