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Rob_Lefebvre
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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 Jan 21. 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 commented on Thomas J Coyle III's blog post Hybrid Power Could Help Drone Delivery Take Off
"I'm well aware of the Atkinson Cycle.  I guess I missed your point because Atkinson cycle has no real connection to hybrid technology.  It can be used on a standard car, in fact Mazda did so like 20 years ago."
yesterday

Developer
Rob_Lefebvre commented on Thomas J Coyle III's blog post Hybrid Power Could Help Drone Delivery Take Off
"JB, how does the hybrid system help improve BSFC? I've never heard that claim.  Is it just because it's constant speed? Wipo: where is your reliability data?  Is see the reliability claim trotted out quite often.  But…"
yesterday

Developer
Rob_Lefebvre commented on Chris Anderson's blog post FAA issues blanket approval for commercial drone use under 200ft for Section 333 holders
"Things seem to be moving along quickly now!  Great news. Hopefully they soon move to do something such as automatic 333 approval for any commercial entity operating a system <2kg, <200 feet, and not over the heads of the public,…"
Tuesday

Developer
Rob_Lefebvre commented on JB's blog post UAV Challenge Medical Express rules have been released.
"Martin, no, I didn't see your delete response if it was regarding your modified heli designs?"
Tuesday

Developer
Rob_Lefebvre commented on Thomas J Coyle III's blog post Hybrid Power Could Help Drone Delivery Take Off
"JB, you have to be careful with some of the blanket statements about ICE efficiency being highest at maximum power. If efficiency is measured as Brake Specific Fuel Consumption (as it typically is) then it's just not true that in all cases,…"
Tuesday

Developer
Rob_Lefebvre commented on Joscht Laznyk's blog post European Drone Regulations Are About To Get Smarter And More Permissive
"I'm hoping that this is just an indication of how things are going to go, and that Canada and the US will quickly follow suit.  I think politicians and other officials are starting to recognize that this is a HUGE industry with many, many…"
Tuesday

Developer
Rob_Lefebvre commented on JB's blog post UAV Challenge Medical Express rules have been released.
"Oh yeah?  Do tell! :)"
Tuesday

Developer
Rob_Lefebvre commented on JB's blog post UAV Challenge Medical Express rules have been released.
"Martin, so to achieve a high forward flight speed, the system with the pusher was actually using more power?  How high of a speed did you achieve? I'm talking about 20+ m/s.  At these speeds, the quad frame has to tipped up quite a…"
Tuesday

Developer
Rob_Lefebvre commented on JB's blog post UAV Challenge Medical Express rules have been released.
"JB, I don't see why alt hold wouldn't work.  Works fine on Helicopters, even when pulling back from high speed where, in Stab mode they pull 6G's if you do nothing with the collective.  In Alt_Hold, nothing, it just manages…"
Monday

Developer
Rob_Lefebvre commented on Thomas J Coyle III's blog post Hybrid Power Could Help Drone Delivery Take Off
"Yeah, I agree.  For a series hybrid, I can't see how could realistically do better than 80%?  Because you need 90% for generation, and then the motor.  Most motors are only 70-80% efficient in their actual operating range."
Monday

Developer
Rob_Lefebvre replied to Armin Beyel's discussion APM 2.6 traditional heli Raptor 50 Nitro throttle control problem
"David, you're using a 2S LiFE pack through the power module to power the flight controller?  This is not recommended.  When the battery voltage drops below... I think it was 6.4V, the output of the PM regulator is undefined.  You…"
Monday

Developer
Rob_Lefebvre commented on Thomas J Coyle III's blog post Hybrid Power Could Help Drone Delivery Take Off
"JB, the "because hybrid" comment was not directed at you.  But rather this company.  And comments like gustavo's.  You can't just say "hybrid is more efficient because it's hybrid". We know we can…"
Monday

Developer
Rob_Lefebvre commented on JB's blog post UAV Challenge Medical Express rules have been released.
"JB, I think the algorithms would do OK with the pusher as-is.  If you were in Loiter, and engaged the pusher such that the Pixhawk was not aware of what is going on, it would basically behave as if there was a strong wind.  It would pitch…"
Monday

Developer
Rob_Lefebvre commented on Thomas J Coyle III's blog post Hybrid Power Could Help Drone Delivery Take Off
"Is there any evidence of the test flights, or this is all theoretical at this point?  Any data on AUW, fuel load, etc?  I find the claim that it can fly twice as far as a gas powered helicopter specious.  Which helicopter?  How…"
Monday

Developer
Rob_Lefebvre commented on Thomas J Coyle III's blog post Hybrid Power Could Help Drone Delivery Take Off
"I'd like to see more specifics on this.  So far all I see is "Because Hybrid!" "
Monday
Thomas Stanley-Jones commented on Rob_Lefebvre's blog post New Drone Service Tests Commercial Usage Laws in Canada
"It would be interesting to see their failsafe's.  I can see someone goofing off halfway down the hill, or bailing, then the drone would hang around until the battery gets low-ish, but the elevation changes would be tricky to manage. …"
Sunday

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 Drone Service Tests Commercial Usage Laws in Canada

Posted on March 20, 2015 at 8:58am 16 Comments

http://bigwhite.cmail2.com/t/ViewEmail/r/3059DF9ADD1D1A942540EF23F30FEDED/D84B544420A969371726EA5DA1051479

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

Continue

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…

Continue

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.

Spurred…

Continue

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:

https://www.unmannedsystems.ca/media.php?mid=4633

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

Continue

Comment Wall (13 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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