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Mark Harrison
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  • Oakland, CA
  • United States
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Mark Harrison's Groups

Mark Harrison's Discussions

Odd rise/descend behavior in loiter, alt hold modes

Started this discussion. Last reply by Richard Boyhan Dec 22, 2013. 2 Replies

The first time I fly, position holding is perfect in all axes.Subsequently (after I put it to another mode and return it to loiter [?]), the altitude does not hold.  When the stick is centered, it…Continue

PX4, not responding to stick movement commands?

Started Jul 6, 2013 0 Replies

I've verified using qgroundcontrol that the PX4 is getting radio input, and calibrated the sticks.  I can arm/disarm, and control throttle.But, no motion sticks (rud, ele, ail) seem to take effect.…Continue

PX4 + wifi?

Started Mar 4, 2013 0 Replies

Any easy way to interface a PX4 to wifi?Continue

Preparing some feedback on the Texas Drone Proposal, feedback solicited!

Started this discussion. Last reply by Grant Goldsmith Jul 15, 2013. 2 Replies

I've started an analysis and write-up of the legislation here:…Continue

 

Mark Harrison's Page

Latest Activity


Moderator
Mark Harrison commented on Ellison Chan's group DIYDrones - CNC Project
"Great video Ruwan!  I hope you'll post some more Shapeoko experiences.  You have made me start to seriously think about getting one!"
yesterday

Developer
Arthur Benemann commented on Mark Harrison's blog post Some MAVLink Protocol Notes
"Just an update: The mavlink code from DroidPlanner has been separated in a new library, so it's easier for anyone who wants to use it (and possibly contribute upstream). Here it is: https://github.com/DroidPlanner/jMavlink One nice thing is…"
Tuesday
Guillaume Helle commented on Mark Harrison's blog post Some MAVLink Protocol Notes
"Hello guys   i have yet a Java implementation for Mavlink : https://code.google.com/p/mavlinkjava/ It works fine on Android, Windows, Linux and embedded Java in drones. Have fun!   Guillaume"
Tuesday

Moderator
Mark Harrison commented on Thanh Nguyen's blog post Low cost version of APM2.5
"Wow, that's a great job.  Your craftsmanship and engineering skills are excellent!"
Apr 9
Austin Suhler commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"Update on my quest to make case fans work for quadcopters, I took apart a random case fan I had laying around and created a custom motor bell using the stock magnets from the fan. So far, I have yet to try high voltages, but at stock voltage, I have…"
Apr 3
Austin Suhler commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"@Gary: Do the fans have to be unmodified, or can I steal the motors and make something that at least lifts itself? ;) This might just be challenge accepted."
Apr 3
Joe Krolla commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"oh boy.. I was thinking about using four vacuum cleaner motors and a 12V inverter, then reverse the AC polarity and create thrust instead of suction... but I realized that I have a thermal problem getting the heat away from these motors at 15k rpm…"
Apr 2

Moderator
Mark Harrison commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"BTW I'll just be hiding behind the concrete bunker when those motors spin up to 15K RPM!"
Apr 2

Moderator
Sgt Ric commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"Hilarious, but I think it would at least LOOK great!"
Apr 2
Jason Dorie commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"If one of these fans doesn't provide enough power to lift itself, just add more of them until they can.  I see a dodecacopter on the horizon."
Apr 2
Quadzimodo commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"Gary - If you were to expand the "most outrageous quad" to "most outrageous multirotor" then I reckon I would be a strong contender with my 3000mm octo project."
Apr 2

Moderator
Sgt Ric commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"I have lots of PC fans (larger server ones as well)...but are they efficient enough? I mean I know that technically, the fewer the blades the more efficient, but this just looks too cool not to work!  These 7 bladed PC fans are engineered to…"
Apr 2

Wiki Ninja
Gary McCray commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"Sounds like we need an April first contest: First one to actually get a quad made from old exhaust fans to actually fly - maybe a realistic time limit like 1 minute or so (before the fans burn out). And I think we should give a special prize to…"
Apr 2
Antonie Kruger commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"Brilliant - loved this...if my son sees this he will cannibalise my Ubuntu server and his PC for the fans....:) "
Apr 2
Austin Suhler commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"Sad thing is, I now want to make this happen. It's feasible if you take the fans apart and use the motors on actual props, drop the heavy plastic cases, and use a lightweight frame/power setup......hmmm.... Rob, Euan, next project for one of…"
Apr 2

Moderator
Sgt Ric commented on Mark Harrison's blog post E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down
"I really enjoyed this whole thread... thanks guys, I needed that!"
Apr 2

Profile Information

About Me:
- working as software engineer, experienced programmer
- living in piedmont, ca
- moderate embedded programming and arduino coding experience
- email: mh@pixar.com feel free to drop me a line!
Please tell us a bit about your UAV interest
- interested in meeting east bay ardupilots
- started in RC places in Summer 2010
- blogging at http://eastbay-rc.com
- currently working on the Arcticopter project.
goal: multicopter AP platform for high-end DLSR, remote photoshoots
details: http://eastbay-rc.blogspot.com/search/label/arcticopter
Hometown:
Piedmont, CA

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Mark Harrison's Blog

E-Waste Quadcopter Lifts Your Spirits While Keeping Costs Down

Posted on April 1, 2014 at 11:29pm 20 Comments

Over at Hackaday, a quadcopter made from ewaste.

"It’s pretty obvious that the main rotors are PC Fans, 140mm in this case. Normally, these wouldn’t be able to create enough lift to get out of their own way…

Continue

Trappy talks flying, regulation, and starting a business

Posted on March 23, 2014 at 11:54am 1 Comment

Trappy, this one's for you!

Jeff Bezos at Amazon hasn't done it. Nor has Fred Smith at FedEx or Scott Davis at UPS. No American CEO has persuaded Washington to relax its chokehold on commercial drone use in the United States. But this month a 29-year-old Austrian entrepreneur living here in Asia broke Washington's drone…

Continue

So Trappy, You Beat the FAA...

Posted on March 6, 2014 at 11:40pm 6 Comments

Where are you going to celebrate?

Comment Wall (2 comments)

At 3:30pm on April 7, 2011, Anil Kumar. M said…
I've checked all the below and are correct.

- is the software configured for X and not + copter?
- is your "front" orientation correct on your board?
- is your board mounted right side up?
- do you have the CW and CCW props attached to the correct motors?

I've checked the manual from kkmulticopter and http://rcexplorer.se/page14/kkguide/kkguide/quad.html
At 6:53pm on July 15, 2012, Daniel Bard said…

Hey Mark, my name is Dan and I'm really new to R/C. I have some questions about the FS-TH9x remote.

First-  if i buy this remote can i use it on fix wing aircraft also?

second would you recommend it for some one like me?

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