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 William Fernandez's discussion UAVs for 3D modeling
"William, you are welcome. We all are here to learn and share our knowledge. The UAV-newby-feeling is nothing to be ashamed of. Even though I build my own models for over 25 years now, i was sweating like sitting in hell when I made my first small…"
Apr 2
marc.kulhavy replied to William Fernandez's discussion UAVs for 3D modeling
"William, I found out its best to let the software do the lens calibration for every job dynamically rather then doing a fixed precalibration. As temperture, aperture and focal point vary, a precalibration makes only sens in terms of a quicker first…"
Apr 2
marc.kulhavy replied to Nicholas C Brewer's discussion Best Drone for Aerial Photography, but Specifically for 3D Surfaces
"Nick, if you have 10 hectars divided in a couple of segments, I would stick to a multicopter. Accuracy mostly depends on the resolution of the camera sensor, the quality of the lens, shutter speed, ISO setting, precision of the used ground control…"
Mar 31
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),…"
Mar 29
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…"
Mar 29
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…"
Mar 29
marc.kulhavy replied to Tamás L. Páll (Tom)'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…"
Mar 29
marc.kulhavy replied to Byron Will-Noel'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

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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