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marc.kulhavy's Groups

marc.kulhavy's Discussions

Bug alerting and Firmware description

Started Sep 6, 2012 0 Replies

Michael,is there any chance You could implement a bug alerting system into the mission planner? I am asking because of a crash I could have avoided if I were aware of the simple mode bug in fw 2.7.1.…Continue

Tags: alerting, Bug

We need a disclaimer!

Started this discussion. Last reply by Chris Anderson Sep 3, 2012. 9 Replies

I think we need a disclaimer to publish across the whole forums and store sites attached to this projects.It should be a collection of advises and principles we all should accept to followThis thread…Continue

Tags: Disclaimer

Worst Crash ever, Log analysis needed!

Started this discussion. Last reply by Jason Short Sep 11, 2012. 112 Replies

Hey folks! Yesterday I had my biggest, worst and most scary crash with my 3DR Quad.Our local firefighters had an open day for public and presented their equipment, did some presentations, they had a…Continue

Tags: Log, Crash

Yaw locking and throttle issue?

Started this discussion. Last reply by marc.kulhavy Feb 17, 2012. 8 Replies

Hi to all,I still have a strange problem with yaw getting locked after some time of flying and not listening to the radio input. This happened over the versions from 2.0.xx to 2.1 final (the one I am…Continue

Tags: lock, throttle, Yaw


marc.kulhavy's Page

Latest Activity

marc.kulhavy replied to Coen's discussion Flying ArduCopter with a single hand in the group ArduCopter User Group
"Coen, what about using a classic tx, but with only one stick? Curtis Younglood flies 3d helis with this setup, it's actually his invention. The throttle could be a foot pedal or located at the back of the tx as a linear…"
Aug 13, 2013
marc.kulhavy replied to Dean Miller's discussion Channel 6 PID Tuning Problem
"Dean, I had the same issue just one hour ago. I had to disable the rc channel 6 setting in the parameter list to nothing. Then the ch6 tuning worked within the whole range."
Aug 6, 2013
marc.kulhavy replied to Alexey Kozin's discussion Howto test arducopter in HIL (hardware in loop) mode? in the group ArduCopter User Group
"Alexey, I tried the same with same results, throttle cannot be set correctly. I cannot find the exact tutorial any more which explains what parameters X-Plane has to send. Actually I never managed to get the HIL up and running for a quad and…"
Jul 19, 2013
marc.kulhavy replied to Randy's discussion ArduCopter-3.0 ready for wider use
"Omg I should take a nap or get more coffe, I had the APM1 in mind while asking this question, forgetting I switched to APM2 a while ago. So while saying correctly APM2 I had the picture of the old APM1 in my mind... Anyway, is the compass on the…"
Jun 25, 2013
marc.kulhavy replied to Randy's discussion ArduCopter-3.0 ready for wider use
"Hey all, one question regarding the onboard compass on an APM2. Is it possible to simply unsolder the compass, attach wires and put it higher on the frame? Regards Marc"
Jun 25, 2013
marc.kulhavy replied to Randy's discussion ArduCopter-3.0 ready for wider use
"Ahoj Radku, you have to test loiter to see the effect. If the copter starts toilet bowling / drifting away in loiter, change declination with ch6 until loiter is spot on. Regards Marc"
Jun 18, 2013
marc.kulhavy replied to Craig Elder's discussion APM Copter 2.9.1.b has been released
"David, how do you power the APM? What you describe could be a brown out, if you power the apm and/or rx through one of the esc's."
Jun 6, 2013
marc.kulhavy replied to Craig Elder's discussion APM Copter 2.9.1.b has been released
"Randy, as you mention"
Jun 5, 2013
marc.kulhavy replied to Arthur Guy's discussion Switch PX4 RC input channels in the group ArduCopter User Group
"Arthur, change the throttle mode on your transmitter from 1 to 3 or 2 to 4 or vice versa, depending on your configuration. Regards Marc"
May 26, 2013
marc.kulhavy replied to Tono's discussion APM2.5 and simonK ESC's in the group ArduCopter User Group
"Tono, make sure the motors spin in the correct direction. The firmware runs fine with the apm, I use simonk and wii-esc flashed escs. The calibration cannbe done one by one by connecting esc to the rx, set throttle to max on your tx, then connect…"
May 25, 2013
marc.kulhavy replied to AJEsq's discussion Arducopter 3.0 RC2 Crash (Suspected Bug with outputs to ESCs)
"Ok, did not knew this. I use VMWare products all day in my job but never had troubles with mismatch on serial or usb connections. Anyway, if you say you switched on a timer on your tx, was that the exact point the motors stopped? Sure you didnt had…"
May 24, 2013
marc.kulhavy replied to AJEsq's discussion Arducopter 3.0 RC2 Crash (Suspected Bug with outputs to ESCs)
"Do I understand right that you uploaded the new firmware, got a verification/checksum error and still kept on and went out flying?"
May 24, 2013
marc.kulhavy replied to peter christian's discussion 10000mah Battery capacity - seriously?
"Well, did you look at the price? 250 bucks is quite a number. I use 2x 4S 5000 mAh batteries from Turnigy, I get one for the tenth of the price and get 30 mins of flight time. With one pack, I have 20 minutes flight time. Personally, I didn't…"
May 12, 2013
marc.kulhavy replied to Duffy's discussion Thrust Issues Arducopter V2.91b
"Duffy, what esc firmware are you using? I had big problems with my MT3605 650kV with the stock 3dr esc firmware. I tried simonk with better results and ended up with multiwii-esc firmware and custom timings. With wrong timings, it needed nearly 80%…"
May 10, 2013
marc.kulhavy replied to Crashpilot1000's discussion SOLVED - How can i flash the MTK 3329 GPS on my apm 2.0 ??
"Good evening, I just managed to update my Mediatek GPS unit onboard a APM 2.0 using USB. I had problems to get the flashing started, but finally managed to start the flash process by constantly pressing the F1 key while disconnecting and connecting…"
May 4, 2013
marc.kulhavy replied to Daniel Gru's discussion Wo fliegt ihr? in the group German Ardu-Group
"Moin Nana, Du kannst gerne jederzeit auf den Platz kommen und mal schnuppern. Ich bin meines Wissens der Einzige mit Coptern, wir fliegen sehr viel Fläche, aber auch die Helifraktion ist mit einigen wirklichen Könnern sehr stark vertreten.…"
May 1, 2013

Profile Information

About Me:
IT Engineer, rc-infected somewhat 20 years ago...
Please tell us a bit about your UAV interest
Aerial Phography, Flight Stabilization, Landscape/Farming Research

Marc.kulhavy's Blog

Flying at No Mechanical Energy Cost: Disclosing the Secret of Wandering Albatrosses

Posted on September 9, 2012 at 12:00am 4 Comments

I found a very interesting journal article about the flying techiques of albatrosses. It describes their ability to soar extreme distances by using the different windspeeds over the open sea, similar to the flying technique of dynamical soaring we use for hanggliding.

It's in PLOS One …


This is how we all should tune in our copters...

Posted on December 31, 2011 at 8:00pm 3 Comments

Happy New Year to everyone!

I found this articles while searching methods for effective PID tuning:

The method is described here:…


Comment Wall (1 comment)

At 6:21am on August 26, 2012, Marvin K. said…

Hi Marc,

bitte schick mir deine Nummer nochmal ich hab sie glaube ich ausversehen gelöscht. sorry




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