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Rob_Lefebvre
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  • Ontario
  • Canada
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Rob_Lefebvre's Discussions

Helicopter Vibration Levels

Started this discussion. Last reply by Rob_Lefebvre Oct 6. 59 Replies

I just wanted to make a post to specifically address the issue of vibrations on helicopters, as I am seeing quite a few logs which exhibit excessive vibrations. This not only affects Loiter, but can…Continue

Warning about Helicopter Power Supply!

Started this discussion. Last reply by Vlastimil Vrskovy Jul 2. 27 Replies

I've posted about this before, but I feel I must reinforce this:You MUST use a completely independent power supply for your APM or Pixhawk than you use for the Servos.  DO NOT use one BEC to supply…Continue

Arducopter 3.2 Warning

Started this discussion. Last reply by Rob_Lefebvre Jun 5. 4 Replies

Just wanted to put out a warning to everybody, that you should not be testing any of the 3.2 Release Candidates for Tradheli until I say so.At this time, I have not flight tested 3.2rc1 or rc2. I…Continue

Who wants to alpha test Flybarred Acro code?

Started this discussion. Last reply by Rob_Lefebvre May 27. 79 Replies

I am attempting to fix the flybar acro code, wanted to get it out with the upcoming 3.1.3 release, but I'm in a bit of a pickle.  It compiles in Arduino, but won't compile in Make for PX4.  I assume…Continue

 

Rob_Lefebvre's Page

Latest Activity


Developer
Rob_Lefebvre commented on Chris Anderson's blog post Good-looking VTOL project on Kickstarter
"Joe, how can you make any of those performance claims (more efficient than a copter) without any data?  It seems like speculation to me."
41 minutes ago

Developer
Rob_Lefebvre commented on Chris Anderson's blog post Good-looking VTOL project on Kickstarter
"JD, it's definitely cool, very sexy looking, and I'm sure you'll raise $1,000,000 (get ready for it). I'm just an applications guy, so I'm more interested in practical performance, but not everybody is."
21 hours ago

Developer
Rob_Lefebvre replied to Ronen Aknin's discussion which is the most stable firmware for theb apm 2.6 mega
"A couple of weeks.  But it contains fixes to many known problems in 3.1.5.  Is 3.2 guaranteed to be perfect? No, but it's safer than 3.1.5. Our stable releases always undergo significant beta testing, to ensure we don't have any…"
yesterday

Developer
Rob_Lefebvre replied to Ronen Aknin's discussion which is the most stable firmware for theb apm 2.6 mega
"3.2, by far."
yesterday

Developer
Rob_Lefebvre commented on Chris Anderson's blog post Good-looking VTOL project on Kickstarter
"Yeah, there's definitely some merits to separate lift and thrust motors.  One problem with tail-sitters, is that to be efficiency in hover, they need large, low-pitch props.  But the low-pitch props result in low maximum pitch-speed…"
yesterday

Developer
Rob_Lefebvre commented on Chris Anderson's blog post Good-looking VTOL project on Kickstarter
"It does look fantastic, I'll give them that. But yeah, this is definitely not the first time this has been done.  It also doesn't outperform everything else out there.  Leonard has done 108 km/h with a quadcopter.  And…"
yesterday

Developer
Rob_Lefebvre commented on kostalexis's blog post "Autonomous Christmas Lab": a robotic "Merry Christmas!"
"Great! :)"
Tuesday

Developer
Rob_Lefebvre replied to Max Patissier's discussion my first big flight away
"No, there is no EKF for APM 2.6.  I think what you're seeing is more of an error in the log analysis program.  Those errors #16 and 17 should be labelled as INAV errors for APM2. "
Tuesday

Developer
Rob_Lefebvre replied to Randy's discussion ArduCopter-3.2 beta testing
"Yes, I've flown auto at 35 m/s with no problem, so it's not something wrong with the parameter or program."
Tuesday

Developer
Rob_Lefebvre replied to Randy's discussion ArduCopter-3.2 beta testing
"This is not an error in AC3.2, but is by design. What you present does have some merit, and might be considered, however, it would be complicated to do, so I'm not sure if it will be done for the next release."
Tuesday

Developer
Rob_Lefebvre replied to Alex's discussion Traditional helicopter, Pixhawk autopilot ACRO mode issues
"This is actually totally normal. The controller "remembers" that you have requested it to move a certain amount, and it will keep trying to move to that position.  It limits the "stored" movement to 10 degrees.  You…"
Tuesday

Developer
Rob_Lefebvre commented on Greg Nuspel's blog post Coaxial without swash plate
"Dave, that's a good point.  You would definitely have Y-axis vibrations at 1/N at the least.  You'd also get some crazy stuff going on, disymmetry of lift and external airflow would cause lead/lag...   it's a bit…"
Tuesday

Developer
Rob_Lefebvre commented on Greg Nuspel's blog post Coaxial without swash plate
"Pretty interesting concept.  I'm also interested in real-world usability.  "
Monday

Developer
Rob_Lefebvre commented on Chris Anderson's blog post New Canadian UAV rules look like a great step forward
"Dan, what do you like about them?  Can you go into more detail?  Just curious to hear your perspective."
Dec 12

Developer
Rob_Lefebvre commented on Chris Anderson's blog post New Canadian UAV rules look like a great step forward
"Acorn, do you really think that it was commercial users (even new ones) flying around the landing approaches of Pearson and Vancouver airports? "
Dec 11

Developer
Rob_Lefebvre commented on Chris Anderson's blog post New Canadian UAV rules look like a great step forward
"Yes, exactly.  I don't want to say it but...  the problem is they are ignoring the unregulated use of recreational systems.  I think they know that there would be a huge backlash if they tried to restrict recreational use.…"
Dec 11

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
Hometown:
Brighton Ontario Canada

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Rob_Lefebvre's Blog

New Transport Canada UAV Regulations Arrive!

Posted on November 27, 2014 at 7:46pm 41 Comments

Well, the moment we have all been waiting for in Canada is finally here.  Transport Canada has published the new UAV regulations.  It is important to understand that these regulations effectively come in 2 parts.  Basically, you have one set of regulations for UAV's less…

Continue

Small Electric Helicopter 108km/h Auto Flight

Posted on September 22, 2014 at 4:13pm 30 Comments

Another recent accomplishment with the Helicopter version of Arducopter was this full auto speed run which achieved a top speed of 30 m/s or 108 km/h.  This was done using 3.2 which features improvements to the helicopter flight dynamics code, as well as Spline Waypoints which is a general…

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Arducopter Flies Gas Powered Helicopter

Posted on September 20, 2014 at 11:20am 56 Comments

Now we're cooking with gas!

I have just completed a project to build a helicopter with a gasoline engine, controlled by Arducopter (of course!)  This helicopter serves as a test bed for future gas heli development work for a client of mine.  The goal was to prove out that it could be…

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Helicopter Presents Attractive Alternative to Multi-rotors and Fixed-wing UAVs

Posted on February 3, 2014 at 1:10pm 335 Comments

I've been working on a new helicopter platform the last few months. Based on an MSH Protos heli which I chose because it's an extremely light weight platform, weighing in at only ~1200g without battery. It has a full belt drive which I much…

Continue

Comment Wall (10 comments)

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

Chris is the Admin. He can help you.

Jason

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.

Thanks.

Nice Greets from Austria

Manuel

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, 
Jon

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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