100KM
DavidJames
  • Male
  • Huntington Beach, CA
  • United States
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DavidJames's Friends

  • Cristian Miuta
  • jaideep gour
  • Andre Schoonbee
  • RM Aviation
  • Tim V
  • Chad Frazer

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DavidJames's Page

Latest Activity


100KM
DavidJames replied to Tim Squires's discussion Plane drop from balloon
"Tim,   I noticed this FPV flyback blog from a balloon drop that may have some useful information. https://rcexplorer.se/projects/2013/03/fpv-to-space-and-back/"
Jan 20

100KM
DavidJames replied to Tim Squires's discussion Plane drop from balloon
"Tim,   The Krytox oils are pretty amazing.   They are what makes the Krytox grease work.    Krytox GPL103 might not be too viscous at low temperatures and has a low vapor pressure.  I think you can get small…"
Jan 19

100KM
DavidJames replied to Tim Squires's discussion Plane drop from balloon
"Tim,   The BLS253 operates over a wider voltage range and costs a little less.    Cleaning out the grease and oiling the gears and bearing lightly is a good idea too.   "
Jan 19

100KM
DavidJames replied to Tim Squires's discussion Plane drop from balloon
"Tim,   Nice project.    For servo bearing and gear grease at high altitude the Dupont Kytox GPL203 grease might work for your application.    Brush type servos have very short lives at high…"
Jan 15

100KM
DavidJames replied to Vincent Diallo-Nort's discussion Drone that can carry 718 grams sensor and be under 2kg
"Vincent, That looks about right.    You will want to put all the components, camera, battery, wings, tail, pixhawk etc on a balance board.   That way you can experiment and find the locations that put the CG at the wing spar…"
Jan 6

100KM
DavidJames replied to Vincent Diallo-Nort's discussion Drone that can carry 718 grams sensor and be under 2kg
"Hi Vincent,  Great to hear you have the bixler 3 flying.   Putting cameras in the belly under the wing works for me.     To open up the center section you may want to move the tail servos back to get the push rods…"
Jan 4

100KM
DavidJames replied to Alexis's discussion Strongest Motors on the market
"Alexis, Here is a link to a post that shows a good technique for comparing rotor prop lift capability.   http://diydrones.com/forum/topics/standard-industry-wide-rotor-test-procedure Anything with a net lift of 10 grams/watt is pretty good."
Dec 23, 2016

100KM
DavidJames left a comment for RM Aviation
"RM, You asked: "Hi David, I have noticed your comment regarding the link in the blog post, what is giving you that impression- password request or malware? Thanks." I was a little surprised when I selected the link In selecting the…"
Dec 14, 2016

100KM
DavidJames commented on Krzysztof Bosak's blog post Comments, debunking and alternative proposal for Amazon's revision for airspace model.
"The link in this post looks like it may be a password phishing scheme, Beware!"
Dec 13, 2016

100KM
DavidJames commented on Chris Anderson's blog post New RTF VTOL plane from Horizon
"Looks fun, but 6 minutes of flight time isn't very much time"
Dec 10, 2016

100KM
DavidJames commented on John C.'s blog post Parrot/Pix4D announce 2017 Climate Innovation Grant
"It looks like a 3DR Solo quadcopter being used with the Sequoia multispectral sensor.   I wonder if the Sequoia multspectral sensor works in the 3DR gimbal?"
Dec 6, 2016

100KM
DavidJames replied to m4gic's discussion Fully redundant drone with no single-points-of-faliure
"The Zipline UAV is a good example of increasing reliability with selective redundancy http://www.bbc.com/news/technology-37646474"
Nov 21, 2016

100KM
DavidJames replied to m4gic's discussion Fully redundant drone with no single-points-of-faliure
"The UAV Lab at the University of Minnesota has done some good work on increasing the reliability of UAVs.   They have found that having redundant servos provides one of the greatest increases in reliability for fixed…"
Nov 21, 2016

100KM
DavidJames replied to Vincent Diallo-Nort's discussion Drone that can carry 718 grams sensor and be under 2kg
"Vincent, I fly a 100 mm long Canon across the fuselage of a bixler 2.     Camera sticks out a bit but really not that much drag.   You can just cut a slot into the fuselage below the wing and slide the camera…"
Nov 12, 2016

100KM
DavidJames replied to Petr Lukin's discussion Transformation from desired motor speeds to PWM signal.
"The Pixhawk ESC 1.4 hardware with the Sapog firmware can be configured to use the standard PPM inputs.  By default it uses the UAVCAN though(which is supported by the Pixhawk controller and the Ardupilot code). The Sapog ESC firmware works…"
Nov 8, 2016

100KM
DavidJames replied to Petr Lukin's discussion Transformation from desired motor speeds to PWM signal.
"Here is a link to the to a recent discussion for the Pixhawk ESC: http://diydrones.com/profiles/blogs/px4-sapog-advanced-open-source-esc-from-the-px4-team"
Nov 7, 2016

Profile Information

About Me:
Control System Engineer
Please tell us a bit about your UAV interest
UAV Planes
Hometown:
Huntington Beach, Ca.

DavidJames's Blog

+100km flight on a charge with a Techpod

Posted on November 14, 2015 at 4:00pm 20 Comments

The mission planner indicates that I got to 120km.    Seems reasonable, flying speed was about 14 m/sec for two hours and 25 minutes.  That is about 120km.

Here is the KML…

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The Snotbot, another drone for good!

Posted on July 30, 2015 at 11:14pm 2 Comments

Just when you thought it couldn't get any more interesting.      Along comes the Snotbot.    A whale research drone that is being developed by  Ocean Alliance and…

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