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Rob_Lefebvre's Discussions

AC3.3 Vibration Logging Discussion Thread

Started this discussion. Last reply by Thorsten Jul 24. 21 Replies

Start this thread to have a place for focused discussion of the new vibration logging function of AC3.3.  I'll start by copy-pasting my initial discussion from the AC3.3 beta testing thread.Continue

AC3.3 TriCopter Improvements, need Input and Testers!

Started this discussion. Last reply by Patrick Krekelberg Aug 15. 13 Replies

As part of my work to fix the RC Map problem for AC3.3, it makes sense to fix the Tricopter tail servo problems at the same time.  The timing on this work is really tight as we're down to the wire to…Continue

AC3.3 TradHeli Release Discussion

Started this discussion. Last reply by zhangpengsir 20 hours ago. 136 Replies

WARNING to TradHeli users:Do not attempt to fly AC3.3 until you hear otherwise from me.  I have not even bench tested it yet, let alone test flown it.  There are quite a lot of changes that have gone…Continue

760uS Rudder Servo Support

Started May 1 0 Replies

Hey guys, I've seen the question asked several times over the years, about whether or not Arducopter could support high speed 760uS rudder servos.  I remember trying to help somebody with it a couple…Continue


Rob_Lefebvre's Page

Latest Activity

zhangpengsir replied to Rob_Lefebvre's discussion AC3.3 TradHeli Release Discussion
"Yesterday and the day before I tested 3.3rc9 firmware, follows the parameter settings before and found everything normal, including follow-me mode, of course, there is no time to test a key take-off and landing automatically!Log in attachment"
20 hours ago

Rob_Lefebvre commented on Chris Anderson's blog post Sony's VTOL drone first flights
"@John, I remember that thing now!  Wow...  that was a long time ago.   I'm extremely curious about the claimed 22lb payload.  Maybe that is for a theoretical scaled up version.  Certainly the demo mechanics shown…"

Rob_Lefebvre commented on Chris Anderson's blog post Sony's VTOL drone first flights
"Meh. I'm surprised to see this effort from Sony.  I wasn't expecting something so... hobby-grade looking. I will refrain from mentioning how I don't think it can outperform a helicopter... oops. :)"
Jolyon Saunders replied to Rob_Lefebvre's discussion AC3.3 TradHeli Release Discussion
"@ Jason, personally have not tested yet but hopefully soon :) I see that in the release notes you have removed the acceleration feedforward for rc-9. Is there a particular reason for this? would have been interesting to see the results of this addon"
Aug 21
Jason Franciosa replied to Rob_Lefebvre's discussion AC3.3 TradHeli Release Discussion
"Anyone test RC9 yet? How's it working?"
Aug 21

Rob_Lefebvre commented on leonardthall's blog post FPV Racing using Arducopter
"Hector, I think your tuning needs work. For sure AC can fly better than that."
Aug 19

Rob_Lefebvre commented on Chris Anderson's blog post Researchers use sound waves to crash drones by confusing sensors. APM vs MultiWii. You'll never guess which one goes down ;-)
"Very interesting.  I was going to assume the double-IMU with EKF did it's job, then realized that they tested an APM, so none of that applies.  I wonder then, why the difference?"
Aug 17

Rob_Lefebvre replied to Wes's discussion Effects of frame design on barometer performance ( and all other non 3.3 specific AC questions)
"Good to see this testing being done, my gas heli is really badly affected by this too. I think the idea of having the Pixhawk in a hamburger-case is not a great one, because it makes the device very large, it's already large enough.  I…"
Aug 17
Patrick Krekelberg replied to Rob_Lefebvre's discussion AC3.3 TriCopter Improvements, need Input and Testers!
"Mine was unflyable with 3.3rc8 as well until I made some Rate Yaw changes suggested by Randy: If it matters, I'm also using the latest beta Mission Planner. This change really made a huge difference. One thing I have noticed, though, is even…"
Aug 15
Patrick Krekelberg replied to Rob_Lefebvre's discussion AC3.3 TriCopter Improvements, need Input and Testers!
"Rob, as I mentioned in the 3.3 thread, I am more than happy to test tricopter-specific builds and to collaborate with you in whatever way is most useful. As for your specific items, just starting from scratch since I just discovered this…"
Aug 15

Rob_Lefebvre replied to Randy's discussion Copter-3.3 beta testing
"I notice some recent chatter in this thread about Tricopters, so are people testing it?  I've had no feedback about my changes in this dedicated thread:"
Aug 15

Rob_Lefebvre replied to Randy's discussion Copter-3.3 beta testing
"I've opened an issue for this, this one is a big problem that should be fixed.  Any input into the best solution?  Please respond to the Issue so it doesn't get lost in the…"
Aug 15

Rob_Lefebvre replied to hft seeker's discussion how to build a transport uav able to carry around 40 kg on 1000 km
"You should probably contact Boeing or Lockheed for something of this scale."
Aug 15

Rob_Lefebvre replied to Randy's discussion Copter-3.3 beta testing
"I would suggesting adding some Expo in your radio, might help you take the edge off your pitch/roll inputs, without having to set the ATC_Accel rates too low.  The risk is that, while low ATC_Accel numbers might help smooth flight in most…"
Aug 11

Rob_Lefebvre replied to Randy's discussion Copter-3.3 beta testing
"Yep.  I typically only use Loiter once the aircraft is up and away from all obstacles."
Aug 11

Rob_Lefebvre commented on Gary Mortimer's blog post T3 Back to the Future
"If I run again, you can expect my final entry to be a Snipe. ;)"
Aug 10

Profile Information

About Me:
Mechanical Engineer
Arducopter TradHeli Lead Developer
Please tell us a bit about your UAV interest
Aerial Photography
Light Industrial Applications
Traditional Helicopters
Brighton Ontario Canada

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Rob_Lefebvre's Blog

New Drone Service Tests Commercial Usage Laws in Canada

Posted on March 20, 2015 at 8:58am 19 Comments

This just popped up on a Canadian Commercial Operator Facebook group and we're discussing the implications and legal…


CBC Documentary: The Age of the Drone

Posted on February 18, 2015 at 8:13pm 3 Comments

On February 19th at 9PM, the Canadian Broadcast Corporation will air a new documentary on drones, following up the one they did last year called Remote Controlled War.  Last year's was more focused on the military aspects, this new one is more commercial/recreational.

I'm not sure what the availability will be for those outside Canada.  Hopefully our…


Iris/Pixhawk Cold Weather Testing

Posted on February 18, 2015 at 5:00pm 27 Comments

Last weekend I drove up north a bit for some real cold weather testing of my Iris+ equiped with Pixhawk.  I had to get up early in the morning to catch -30C temperatures which is about as cold as I'm interested in testing.  At -30C, my gloved fingers froze after a few minutes.  Not quite frostbite, but deep into pain territory.



Canada to Regulate Recreational Flights Like Commercial

Posted on February 11, 2015 at 1:30pm 7 Comments

I'm not sure if anybody who is not a member of Unmanned Systems Canada can see this report or not:

So I will summarize:  At a meeting of the International Civil Aviation Organization in Montreal last week,…


Comment Wall (13 comments)

At 5:59pm on November 30, 2011,
Jason Short

Chris is the Admin. He can help you.


At 8:22pm on May 16, 2012, Carl La France said…

Robert thanks for your input the 1/8 aluminum on  on the fuselage will be a milled out channel running  half way down the side of the plane    to attach the wing the horizontal stabilizer and the vertical fin to a Exoskeleton about 1 1/2 pounds the rest of the plane is foam and fiber glass there was no distortion welding we had it clamped down  pretty good Thanks again Carl

At 4:26am on July 26, 2012, OG said…

Thanks for you assistance with my ecommerce sight yesterday . I appreciate it so much I give you my cost your first porches.

At 6:17pm on November 27, 2012, Dwgsparky said…

Hi Robert, sorry I missed your request. still getting used. to this system.

Sorry, not waterslides,,,, Kiddie trains from Granby.

At 7:53pm on January 24, 2013, Joshua Johnson said…

My bad I was just trying to give new members someone they can ask questions to because the site is super confusing at first for a while when your new. Ill stop doing it!

At 11:47pm on April 23, 2013, Manuel Zangenfeind said…

Dear Mr. Lefebvre,

I saw some videos from your heli in Loiter Mode and thought wow this heli is standing rigid in the air.

I'm using a TREX 700E and want to fly this heli with apm 2.5 version 2.91 autonomously.

Currently I want to adjust the PID parameter. The stabilize and the Altitude Hold Mode is working perfect, but I have some problems with the Loiter values.

So would it be possible to send me your PID values of the loiter mode? I think they have to be very similar.


Nice Greets from Austria


At 2:56pm on July 8, 2013, Jonathan Weisburst said…

Hi Mr. Lefebvre, 

Thanks for getting back to me.  Do you have any suggestions in terms of renting or hiring aerial videography crews or drones?  

All the Best, 

At 11:06pm on June 3, 2014, Matt said…

Hi Rob,

Interested in making a Tandem out of 2x 800 sized helicopter. Just interested to discuss your thoughts.

At 7:34pm on July 12, 2014, Eric said…

Hi Rob, I saw your DroneCon talk on youtube (which was great, thanks!), and it looks like you got cut off towards the end there. By any chance is the full slide deck available somewhere? Or was there much more left? Thanks!

At 3:02am on August 1, 2014, Artem said…
Hi Rob, i know you had a lot to do with AC yaw control, could you confirm if motor values are used in the formula for the yaw servo control? In other words if running a motor in a wrong direction would affect the yaw control. If so is this something that appeared in the code since 3.1.3 or was it there before? Thank you!

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