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Rob_Lefebvre
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  • Ontario
  • Canada
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Rob_Lefebvre's Groups

Rob_Lefebvre's Discussions

Helicopter Vibration Levels

Started this discussion. Last reply by Rob_Lefebvre Oct 6, 2014. 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 Stuart Brookes on Wednesday. 30 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, 2014. 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, 2014. 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 replied to Dave Shrader's discussion Gas Hybrid Quad Rotor UAV?
"Sergey, that is impressive work.  Congrats. However, this is still not the same thing as a machine designed to do to the same job all day every day.  That thing couldn't even lift the gas engine, let alone all the other parts…"
21 hours ago

Developer
Rob_Lefebvre replied to Dave Shrader's discussion Gas Hybrid Quad Rotor UAV?
"Sergey, you can doubt all you want, but that doesn't make you right."
22 hours ago

Developer
Rob_Lefebvre replied to Dave Shrader's discussion Gas Hybrid Quad Rotor UAV?
"Here's a helicopter with essentially the same motor. "
22 hours ago

Developer
Rob_Lefebvre replied to Dave Shrader's discussion Gas Hybrid Quad Rotor UAV?
"Sure, a record-setting helicopter would be expecting to be operating with no head-room.  But then so do the record-setting helicopters.  They normally hover at 80% throttle, and sometimes they are constructed so flimsy that they break up…"
22 hours ago

Developer
Rob_Lefebvre replied to Anna Tian's discussion Best open source autopilots v.s. commercial autopilots for conventional fixed wing unmanned aircraft usage
"Ah, interesting."
22 hours ago

Developer
Rob_Lefebvre replied to Anna Tian's discussion Best open source autopilots v.s. commercial autopilots for conventional fixed wing unmanned aircraft usage
"Veikko, I agree with most of your points. Our codebase has had a value estimation of something like $2M, and that does not include any testing time that was required to develop and prove it out.  I really struggle to see how close-source…"
22 hours ago

Developer
Rob_Lefebvre replied to Anna Tian's discussion Best open source autopilots v.s. commercial autopilots for conventional fixed wing unmanned aircraft usage
"Hi Dan, What do you mean by "true gyros", and what technology are then if not MEM's?  Laser ring gyros, or ? Also how is primary core redundancy managed?  Somewhere, there must be one final IC which does the switching.…"
22 hours ago

Developer
Rob_Lefebvre replied to Randy's discussion ArduCopter-3.2.1 Beta Testing
"Actually, I have found the opposite is true with modern ESC's running governor and soft-start. I initially had heli set up like a multirotor, without the Ch8 kill-switch function.  The motor would shut on and off with the throttle just…"
Friday

Developer
Rob_Lefebvre replied to Randy's discussion ArduCopter-3.2.1 Beta Testing
"Do you have the log from this? "
Friday

Developer
Rob_Lefebvre replied to Dave Shrader's discussion Gas Hybrid Quad Rotor UAV?
"Heli rotor blades are only inefficient in a hover.  A rotor blade can only be optimized for one flight condition.  The more optimized you make it for a given flight regime (ie: hover) the less efficient it is in other regimes, ie: forward…"
Friday

Developer
Rob_Lefebvre replied to Dave Shrader's discussion Gas Hybrid Quad Rotor UAV?
"Just because the majority of helicopter users do not understand their machines, does not mean that their results are representative of the state of the art of the technology. I could double or triple the flight time of the helicopter in that video…"
Friday

Developer
Rob_Lefebvre replied to Dave Shrader's discussion Gas Hybrid Quad Rotor UAV?
"No. They don't necessarily have better video quality.  And they do not have better payload or flight time, in any size.  Small electric multirotors are good because they are very simple.  That's the main reason they are…"
Friday

Developer
Rob_Lefebvre commented on Paul's blog post Blank Coverage from TC in Airport Zone
"Interesting.  What do you know about the blanket SFOC or airport?  There is no mention in the article. I do now know how they could have gotten a blanket SFOC?  My understanding is under the new rules, you can't get a blanket…"
Friday

Developer
Rob_Lefebvre replied to Dave Shrader's discussion Gas Hybrid Quad Rotor UAV?
"Actually, though, this might be the key. The big problem with the concept of a gas-engine-powered drone, is the weight of the gas engine.  Consider for example, the Zenoah G320, which has the highest power/weight of any commonly available and…"
Thursday

Developer
Rob_Lefebvre replied to Dave Shrader's discussion Gas Hybrid Quad Rotor UAV?
"Turbine engines are less fuel efficient than piston engines.  The reason they are typically used is power/weight.  They are used basically when you want a lot of power at the expense of fuel efficiency."
Thursday

Developer
Rob_Lefebvre replied to Dave Shrader's discussion Gas Hybrid Quad Rotor UAV?
"That "first one" seems really... sub-optimized.  Why an Octocopter?  Just go quad.  And it's got the central props blowing directly on this huge central mass that creates a huge aerodynamic download, probably pretty…"
Thursday

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

Oh Look. Yet another quadcopter goes over $1M on Kickstarter.

Posted on January 6, 2015 at 2:39pm 37 Comments

I don't really even know what to say anymore. It has 4 motors.  And a camera. And wifi control. This one has a flash light source though, so that's new.  …

Continue

Ardupilot.com Forums Temporarily Down

Posted on December 19, 2014 at 12:30pm 15 Comments

This is just a quick note to say that the Ardupilot.com/forum/ was down temporarily due to server issues.  

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…

Continue

Comment Wall (11 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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