"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…"
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marc.kulhavy
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marc.kulhavy's Discussions
Bug alerting and Firmware description
Started Sep 6, 2012 0 Replies 0 Likes
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
We need a disclaimer!
Started this discussion. Last reply by Chris Anderson Sep 3, 2012. 9 Replies 1 Like
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 jasonshort Sep 11, 2012. 112 Replies 0 Likes
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
Yaw locking and throttle issue?
Started this discussion. Last reply by marc.kulhavy Feb 17, 2012. 8 Replies 0 Likes
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
marc.kulhavy's Page
Latest Activity
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%…"
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…"
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.…"
marc.kulhavy replied to Craig Elder's discussion APM Copter 2.9.1.b has been released"Hmmm... I just took a look at the news on mikrocopter.de, they now offer an external acc board for better alt hold. They use a 3 axis R9500 mems sensor, which is working on the basis of thermal changes and promises not to be affected that much by…"
marc.kulhavy replied to Randy's discussion ArduCopter 2.9 / 2.9.1 released"John,
the H(ardware)I(n the)L(oop) is for simulation, the other for real flight.
I think you have to use arduino ide to upload the hex files.
Regards
Marc"
marc.kulhavy replied to Craig Elder's discussion APM Copter 2.9.1.b has been released"You are using 25 mWatt 2.4 GHz for rc and a 1.2 GHz 1000 mWatt for video! A very bad idea as those frequencies are harmonic pairs. Didnt look at your logs, but using those two systems without low pass filters is a build to crash insurance,…"
marc.kulhavy replied to Craig Elder's discussion APM Copter 2.9.1.b has been released"I think that coupling the control inputs with like we do with throttle down yaw left is generally a bad idea. Main Controls should always be main controls, not more.
Imagine you sit in a real airplane and while applying full left rudder and throttle…"
marc.kulhavy commented on Neill McOran-Campbell's blog post Massive crash: Dont forget to tune your PIDS in a rapid descent if you have a heavy quad and big motors!"I would bet the flip was caused by one or two props loosing lift, as you or the apm reved up the throttle to the max. This did not look like a flip caused of bad pid settings."
marc.kulhavy replied to Randy's discussion ArduCopter 2.9 / 2.9.1 released"Hmm... One should make a list of how the different tx/rx combos behave, if they have fs, a stable signal output etc. Maybe this comparison would clarify the best thing to do for the deadpilot detection.
But anyway if tx dies in loiter and no battery…"
marc.kulhavy replied to Randy's discussion ArduCopter 2.9 / 2.9.1 released"Randy, thanks for clarification!"
marc.kulhavy replied to Randy's discussion ArduCopter 2.9 / 2.9.1 released"Randy,
I am already watching the progress on firmware.diydrones.com for a few days now. Its like a first class seat in the development theatre. Two questions. What time is used when generating the folders and files, gmt? Second, the descriptions…"
marc.kulhavy replied to Randy's discussion ArduCopter 2.9 / 2.9.1 released"Sounds like a good idea, but what about loiter? The only thing to recover from this would be an automated rtl by battery failsafe. Deadman detection in trains or used by firemen need a constant input every x seconds, during loiter, there is no…"
marc.kulhavy replied to Randy's discussion ArduCopter 2.9 / 2.9.1 released"I bet your startup behaviour is caused by the different escs you are using. I had a similar issue after I bricked the bec on one esc. It still worked, but produced less thrust at a given throttle input than the other escs. The copter needed a higher…"
marc.kulhavy replied to Markus Horeld's discussion RTL/Failsafe at the ground lets the copter jump"The params to tune accel z are here:
http://api.ning.com/files/xdSfF5Y62TQZCvUj-**VhrM5S08b*DP85jJBEcsZZGM3-zl3-GzVexT8PArqbJEjhAhToEaWv8C*vuvQCrkJZQ__/ThrottleParams.png"
marc.kulhavy replied to Markus Horeld's discussion RTL/Failsafe at the ground lets the copter jump"If you are using version prior to 2.9.1, it could be baro, or ver 2.9.1 with accel z turned off. If accel z turned on, check throttle accels and vibrations."
Profile Information
- About Me:
- IT Engineer, rc-infected somewhat 20 years ago...
- Tell us a bit about your UAV interest
- Aerial Phography, Flight Stabilization, Landscape/Farming Research
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- Weilerswist
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 2 Likes
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 2 Likes
Happy New Year to everyone!
I found this articles while searching methods for effective PID tuning:
http://www.icrobotics.co.uk/wiki/index.php?title=3D_Printed_Quadrocopter#Tuning_the_PID_loops
The method is described here:…
ContinueComment 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
:D
mfg
marvin
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Season Two of the Trust Time Trial (T3) Contest has now begun. The fourth round is an accuracy round for multicopters, which requires contestants to fly a cube. The deadline is April 14th.A list of all T3 contests is here.
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