"According to the article it has higher power density, but not higher energy density then current batteries. So it mean that you can draw more current out of the battery quickly, and charge it quicker. A higher C rating using current LiPo terms. But…"
Developer
-
John Arne Birkeland
- Male
- Norway
- Blog Posts (15)
- Discussions (327)
- Groups
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John Arne Birkeland's Discussions
Problem maintaining pitch when accelerating / decelerating.
Started this discussion. Last reply by Michael Zaffuto Jul 2, 2010. 29 Replies 0 Likes
Servo problem with the new red (328) cards?
Started this discussion. Last reply by Chris Anderson May 3, 2009. 22 Replies 0 Likes
John Arne Birkeland's Page
Latest Activity
DeveloperJohn Arne Birkeland commented on Joshua Ott's blog post Hero 3 with interchangeable lens mount
"R, not that many that offer 2.7K@24, 1080p@60 and 720p@120fps and 48mbit h.264 recording in this price range."
DeveloperJohn Arne Birkeland replied to Petrus Botha's discussion How do you calculate quadcopter lifting capability?
"You should calculate lift at ~50% throttle. In other words the copter and payload should hover at 50% throttle. The reason for this is that the copter needs a lot of thrust headroom to maneuver properly. You also get very short flight times if you…"
DeveloperJohn Arne Birkeland replied to Philip Sulikosky's discussion Large Heli versus Large Multirotor - Which is Best in wind?
"Helis are definitively better at handling wind.
But there are some tradeoffs. Helicopters are mechanically much more complex and costly. The biggest weakness with helicopters from a AP view is vibrations. It can be really hard to make a heli run…"
DeveloperJohn Arne Birkeland commented on Hooks's blog post APM 2.5 from hobbyking
"HobbyKing is a bit of a dilemma. On the one side they have more or less single handedly reduced R/C prices to sane levels compared to what stuff used to cost earlier. Much of this by removing all the costly middlemen and insane brand markups. But on…"
DeveloperJohn Arne Birkeland replied to Richard's discussion ATmega32u2 firmware detect ?
"Any board manufactured from 5. march 2013 or later should have the latest ArduPPM v.2.3.16. If the board was manufactured before that date it will have v2.3.13.
There is no easy way to check the firmware version. It's best to just upgrade to…"
DeveloperJohn Arne Birkeland commented on Joshua Ott's blog post Hero 3 with interchangeable lens mount
"With C mount you can get pretty much anything you want, including motorized zoom and auto iris lenses. Only thing missing would be proper manual exposure and white balance settings in the camera, and it would be a true "very close to pro"…"
DeveloperJohn Arne Birkeland replied to Antoine Rennuit's discussion MCU vs RTOS
"Autopilots can be complex beasts, and their nature has many tasks running in parallel. So once you get past the initial learning curve of a RTOS, it is actually much more efficient and easier to make a autopilot with."
DeveloperJohn Arne Birkeland commented on Thomas J Coyle III's blog post DJI Innovations | Aerial Video Competition
"I always get a bad taste about this kind of competition. You see them everywhere, but this one doesn't even try to sugarcoat it. When reading between the lines, they are basically saying something like.
"Send us your best material so we…"
DeveloperJohn Arne Birkeland commented on Yusuf Pirgali's blog post HD video for UAV's
"http://www.cavium.com/PureVu-3D_CNW5302.html
This is the best option I know of so far for streaming low latency h.264 using standard Ethernet/WiFi.
On paper it looks very promising and has adaptive bandwidth management, which is critical to get…"
Etienne commented on John Arne Birkeland's blog post Autodesk PhotoFly 2 - Automatic 2D to 3D conversion"Agisoft's Photoscan software does this type of thing and works really well with aerial mapping and 3d terrain model generation. I was recently in the fortunate position to test it's results against a 4mm accurate Leica GPS (using…"
DeveloperJohn Arne Birkeland commented on SkyrisFX's blog post Building a unique GoPro Gimbal for the 3DR Hexa (video below)
"Btw. square tubes will transfer more vibrations along the flat sides then a round tube. Nothing beats round carbon fiber tubes for making a copter with good vibration characteristics."
DeveloperJohn Arne Birkeland commented on Manfred Dickgiesser's blog post The mysterious AltHold problem .... solved
"The barometer sensor is indeed sensitive to strong sources of light. For this reason the sensor is covered with black foam inside the APM 2.5 casing."
DeveloperJohn Arne Birkeland replied to David M. Zakharia's discussion 14.8v (4s lipo) voltage divide to 7.4v (2s lipo)
"The LIPO Regulator from JP is 5A, while the dlux ubec is 10A. But other then that they should both work. Neither has built in R/C signal pass-through, so you will have to wire that manually.
"
DeveloperJohn Arne Birkeland replied to Hugues's discussion NEVER connect a Capacitor backup or voltage protector on APM board
"We need absolute confirmation that the unwanted RTL activation does NOT happen when the is cap removed and everything else is exactly the same. As many already have said, the isn't any reason that a cap should make any difference when you turn…"
DeveloperJohn Arne Birkeland replied to David M. Zakharia's discussion 14.8v (4s lipo) voltage divide to 7.4v (2s lipo)
"You want one of these instead:
http://www.hobbyking.com/hobbyking/store/__24753__Turnigy_dlux_10A_10_60V_HV_SBEC.html"
John Arne Birkeland's Blog
Two-Stage Copter
Posted on December 28, 2012 at 7:00pm 10 Comments 4 Likes
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 5 Likes
Teensy 3.0
Posted on October 11, 2012 at 2:17am 14 Comments 1 Like
Parallella: A Supercomputer For Everyone (Kickstarter)
Posted on September 29, 2012 at 10:50am 11 Comments 8 Likes
NASA Morpheus lander (rocket quad) - crash and burn
Posted on August 9, 2012 at 3:00pm 15 Comments 3 Likes
I guess even the big boys have to try a couple of times before they get it right. :)
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,
DeveloperJohn 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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