marc.kulhavy
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marc.kulhavy's Discussions

The reason for being unable to upload new firmware is....

Started Jan 25 0 Replies

...that on some computers (like the one I am using right now), there are some other COM devices like GPS and some broadband adapters installted, which seem to have the option of forcing them into…Continue

Tags: firmware, upload, Pixhawk

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 robert fujii Aug 24, 2014. 113 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 Nicholas C Brewer's discussion Best Drone for Aerial Photography, but Specifically for 3D Surfaces
"Hi Nick, yes I meant digital elevation and surface models. I understand the wish to have a multicopter, thats how I started with mapping jobs, too. But quickly I turned back to airplanes (being an rc aircraft pilot and builder for over 25 years),…"
yesterday
marc.kulhavy replied to William Fernandez's discussion UAVs for 3D modeling
"I use airplanes (a strongly modified Maja 2,2m wingspan) most of the time for mapping purposes with cameras like the Nex7, Alpha6000 and similar, including dual camera mounts for Visible/NIR/IR photography. I can reach a GSD of 5mm and a one flight…"
yesterday
marc.kulhavy replied to Nicholas C Brewer's discussion Best Drone for Aerial Photography, but Specifically for 3D Surfaces
"Do you talk about DEM or DSM? With or without buildings mainly? What area do you want to cover? Did you concider using an airplane instead of a multicopter? What resolution / GSD do you need to achieve? I use airplanes mainly for orthophotos and…"
yesterday
marc.kulhavy replied to Pall Tamas's discussion Maja +APM help needed.
"Pall, I hope you have reworked and reinforced the rudders and hinges on the Maja, as they are super sluggish and ineffective and especially the ailerons can have a negative yaw effect on the plane. I do replace the whole rudders on the Majas I…"
yesterday
marc.kulhavy replied to Global_Saffer's discussion Recommendation Needed: Aerial Imaging, 2D 3D Mapping, and IR images
"I would recommend a fixed wing aircraft. I use mine more often for aerial mapping than my copters. And, the airplane is cheaper than a copter, has a longer endurance and covers a lot more area. I use Sony Nex cameras and most customers are happy…"
Feb 23
marc.kulhavy replied to Sean Headrick's discussion Problems with Ducted fan design with standard PIDs in the group ArduCopter User Group
"New pixhawk and gps/compass?"
Feb 4
marc.kulhavy replied to Sean Headrick's discussion Problems with Ducted fan design with standard PIDs in the group ArduCopter User Group
"If you add yaw to this graph, you will wee that you have little yaw movement and maximum motor throttle changes. This clearly indicates a wrong mots/prop setup regarding order of motors and/or spinning direction. Make sure you have selected the…"
Feb 4
marc.kulhavy replied to Sean Headrick's discussion Problems with Ducted fan design with standard PIDs in the group ArduCopter User Group
"Can you provide a screenshot of the motor logs? I had a similar issue with my hexa where I accidently tilted all the motor mounts to one side due to incorrect measuring. This resulted in a very odd behaviour, but was clearly seen in the motor logs…"
Feb 3
marc.kulhavy replied to Sean Headrick's discussion Problems with Ducted fan design with standard PIDs in the group ArduCopter User Group
"Sean, nice project! But I can't help seeing the props mouted in the wrong order. In the picture above, the two front props both are ccw, the ones in the back cw. On a quad, the spinning direction should be alternating from motor to motor. This…"
Feb 3
marc.kulhavy posted a discussion

The reason for being unable to upload new firmware is....

...that on some computers (like the one I am using right now), there are some other COM devices like GPS and some broadband adapters installted, which seem to have the option of forcing them into bootloader mode or at least talking to them through a serial connection.In my case, I tried to flash a brand new Pixhawk with the current 3.2 plane firmware and nothing worked. So I finally tried the px4uploader.exe in the MissionPlanner directory. And voila! It searches the COM ports one by one and…See More
Jan 25
robert fujii replied to marc.kulhavy's discussion Worst Crash ever, Log analysis needed!
"Hello - I have some questions on  using Mission Planner with SITL: 1) Is it possible to maneuver the copter manually as you would with an Remote Controller ? 2) How would I use SITL with my own customized copter  build or a beta version of…"
Aug 24, 2014
marc.kulhavy commented on Marco Bauer's blog post Mikrokopter BL-Ctrl i2c ESC support now in ArduCopter with Pixhawk/PX4
"Marco, glad to hear your MK's are performing as they shoud. I respect the work of Mikrokopter, they were one of the first in this sector, without them many things wouldnt be that good as they are now. I absolutely agree with you, if your copter…"
Apr 20, 2014
marc.kulhavy commented on Marco Bauer's blog post Mikrokopter BL-Ctrl i2c ESC support now in ArduCopter with Pixhawk/PX4
"Nice to see the capabilities growing, although i find the Mk i2c a horrible idea regarding safety considerations. If one device in the bus fails, you are done. A couple of copters came down this way."
Apr 20, 2014
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

Profile Information

About Me:
IT Engineer and professional Aerial Photographer at www.luftbildfotograf.de
Please tell us a bit about your UAV interest
Aerial Phography, Photogrammetry, Landscape/Farming Research, 3D-Reconstruction, Digital Elevation Models
Hometown:
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

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 …

Continue

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:

http://www.icrobotics.co.uk/wiki/index.php?title=3D_Printed_Quadrocopter#Tuning_the_PID_loops

The method is described here:…

Continue

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

:D

mfg

marvin

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