John A. Malley
  • Male
  • Bellevue, WA
  • United States
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John A. Malley commented on Chris Anderson's blog post WSJ scoop on forthcoming FAA rules -- pilots license will be required for commercial use unless Congress intervenes
"I should be more clear about the need for a pilot's understand of the "rules of the road" and controlled airspace. We owe a duty of care to third parties and their property whenever we use a UAS with a UAV.  We should take…"
Nov 29, 2014
John A. Malley commented on Chris Anderson's blog post WSJ scoop on forthcoming FAA rules -- pilots license will be required for commercial use unless Congress intervenes
"A pilot's license isn't needed so much as is a pilot's understanding of controlled airspace and the "rules of the road." I think in the long run we in the USA will see something similar to the rules in 14 CFR PART 101-…"
Nov 28, 2014
John A. Malley commented on Chris Anderson's blog post New NRC report on frontiers of UAV research
"Wow, we talked about this very issue today day one of "UAS Applications, Operations and Support: Key Topics of Industry," a two day course offered by Embry-Riddle, in Renton, WA (outside Seattle.) I can understand the comment in the NRC…"
Jun 5, 2014
John A. Malley commented on Chris Anderson's blog post Why drones weren't allowed to fly at the Washington mud slides
"I think Stuart Brookes "hit the nail on the head." Why aren't folks as worried about helicopters or fixed-wing airplanes flying over and taking pictures with telephoto lenses?  Why aren't they worried about meta-data…"
Jun 5, 2014
John A. Malley commented on John A. Malley's blog post Analysis of body axis yaw rate on quadcopter controllability in normal and single motor or prop failure case
"@André Bertelsen - Thanks for pointing me to L1-AC and the on-line lectures. Google shows there's activity in applying it to quadrotors as well as fixed-wing UAVs.  I read two papers this weekend with strikingly different takes on…"
Feb 16, 2014
John A. Malley commented on John A. Malley's blog post Analysis of body axis yaw rate on quadcopter controllability in normal and single motor or prop failure case
"@ArthurK - Still thinking about your suggestion. "
Feb 16, 2014
André Bertelsen commented on John A. Malley's blog post Analysis of body axis yaw rate on quadcopter controllability in normal and single motor or prop failure case
"Looks good, you should look into L1 adaptive control - a good lectur about it here:https://www.youtube.com/watch?v=w8L2JdmpccE I'm currently making my masters about an L1 controller on a quadcopter - hoping to make it run on the APM (dont…"
Feb 14, 2014
ArthurK commented on John A. Malley's blog post Analysis of body axis yaw rate on quadcopter controllability in normal and single motor or prop failure case
"I have been looking at the ETH video too when it was announced. However I fail to see how this could be special. What I see is a quad that is converted to a rotor disk (or better cone) than is controlled by precession forces. Just like a helicopter…"
Feb 11, 2014
John A. Malley commented on John A. Malley's blog post Analysis of body axis yaw rate on quadcopter controllability in normal and single motor or prop failure case
"Off the top of my head, I don't know. We would want to look at the moments of inertia for the tricopter and the body axis attitude accelerations in terms of the cross-products of pitch and roll rates when the tricopter has a body-axis yaw rate."
Feb 10, 2014
Jerome commented on John A. Malley's blog post Analysis of body axis yaw rate on quadcopter controllability in normal and single motor or prop failure case
"curious, in theory could we could build a tricopter without a servo/pitch then?"
Feb 10, 2014
Jesus A commented on John A. Malley's blog post Analysis of body axis yaw rate on quadcopter controllability in normal and single motor or prop failure case
"Yes! Thats great news."
Feb 10, 2014
Dennis Okeefe commented on John A. Malley's blog post Analysis of body axis yaw rate on quadcopter controllability in normal and single motor or prop failure case
"Well done."
Feb 10, 2014
John A. Malley posted a blog post

Analysis of body axis yaw rate on quadcopter controllability in normal and single motor or prop failure case

The ETH video demonstrating a new algorithm to save a quadcopter after a single motor or prop failure didn’t reveal the algorithm. It did get me thinking about the quadcopter dynamics after a motor or prop failure.  My analysis starts with the model above, and the equations in “Quadrotor Dynamics and Control” by Randal W. Beard,…See More
Feb 10, 2014
John A. Malley commented on Marius van Rijnsoever's blog post Ostrich Quadcopter
"Mr. Jansen, the artist, explains the intent of his pieces on his web site, at http://www.bartjansen.tv/index.php?page=bio  I understand his work to be critiques of the ideal use of technologies versus the actual uses of technologies. Just…"
Aug 4, 2013
John A. Malley commented on John A. Malley's blog post The ultimate public UAS - a space telescope for everyone, accessed over the Internet
"It is a small space telescope, comparable to putting my Meade LX90GPS into LEO is how I thought about it. Should get a much better view outside a significant  portion of the atmosphere. It will carry a 5 Megapixel CCD camera. PR expects its…"
May 30, 2013
Monroe King commented on John A. Malley's blog post The ultimate public UAS - a space telescope for everyone, accessed over the Internet
"No, you didn't delete it I did right after I said it. Reason being if you look at the backers. They don't need funding! Our team does :) Space ship 2 can't possibly make orbit much less one high enough. There is no affordable comms…"
May 29, 2013

Profile Information

About Me:
Owner and operator of aerospace consulting company in USA. Hands-on work in Boeing autopilot control laws and certification for B737 classics and B777.
Please tell us a bit about your UAV interest
Interested in UAV autopilot control laws, sensor integration, Flight Management control laws, as applied to UAVs, investigating new ideas for UAV control, data exchange between UAVs, UAV formation flying, etc.
Hometown:
Bellevue, Washington, outside Seattle

John A. Malley's Blog

Analysis of body axis yaw rate on quadcopter controllability in normal and single motor or prop failure case

Posted on February 9, 2014 at 9:30pm 8 Comments

The ETH video demonstrating a new algorithm to save a quadcopter after a single motor or prop failure didn’t reveal the algorithm. It did get me thinking about the quadcopter dynamics after a motor or prop failure.  My analysis starts with the model above, and the equations in “Quadrotor…

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The ultimate public UAS - a space telescope for everyone, accessed over the Internet

Posted on May 29, 2013 at 9:24am 3 Comments

Planetary Resources launched a Kickstarter project to fund a first-of-its-kind public "Hubble Space Telescope."…

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ArduCopter Bridge Inspection - is it feasible?

Posted on May 27, 2013 at 12:27am 13 Comments

http://i.i.com.com/cnwk.1d/i/tim2/2013/05/24/bridge_collapse_AP529994068518_fullwidth_620x350.jpg

The Skagit River bridge collapse on Interstate 5 in Washington State, USA, got me thinking about using the Arducopter for large, inaccessible infrastructure inspections. I drove my family across this bridge many times so I took its unanticipated collapse harder than most who heard the news in far away places. Granted, metal fatigue or corrosion didn't directly lead to the collapse. Current data (witnesses and surveillance camera footage) point to repeated collisions between…

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Foam Pad "launch pad" eliminated takeoff instabilities in Acrobatic and Stablizer Modes

Posted on September 10, 2012 at 11:30am 11 Comments

 

Summary: Takeoff from a foam pad on top of dry grass/lumpy lawn alleviated instabilities experienced when taking off from the dry grass/lumpy lawn.  No gain changes made to the 3DR ArduCopter code, using the "factory" settings for Stabilizer and Acrobatic…

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