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

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

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Latest Activity


100KM
DavidJames replied to Asim's discussion Ultimate Auto Mode Fail Safe Design: Logic inside PixHawk
"There is an advanced failsafe system in the ArduPilot Fixedwing branch. http://ardupilot.org/plane/docs/advanced-failsafe-configuration.html Looks like this provides quite a bit of additional capability."
May 21

100KM
DavidJames replied to Asim's discussion Ultimate Auto Mode Fail Safe Design: Logic inside PixHawk
"Asim,   For the ArduPilot Plane the plane transitions into "Circle" if GPS is lost.    Loiter requires GPS.    Circle does not, but the aircraft will drift with the…"
May 20

100KM
DavidJames replied to Ahmed Desoky's discussion What is the best single board computer and autopilot for fixed wing UAV? Without cost limitation
"Here is a link to the companion computers developers page for ArduPilot: http://ardupilot.org/dev/docs/companion-computers.html"
May 20

100KM
DavidJames replied to Arunava Pal's discussion Pixhawk Versions
"For high stability you want the autopilot with the lower noise IMU gyros.    The Pixhawk 1 with the lower noise MPU6000 IMU gyros is a better autopilot for hexacopter stability.    The Pixhawk 1 uses the same processor…"
May 8

100KM
DavidJames commented on Chris Anderson's blog post More powerful Pixhawk 3 coming soon
"That ICM20602 looks great.   Both the ICM20600 and the ICM20602 have rate noise power spectral intensity of 0.004 deg/sec/root(Hz).   This is slightly less noise than the MPU6000's 0.005 deg/sec/root(Hz) and much less than…"
May 6

100KM
DavidJames replied to Arunava Pal's discussion Pixhawk Versions
"The Pixhawk2.1 is an well designed autopilot.    Not sure why the lower performance IMU was used.   Only one MPU9250 IMU is on the isolated IMU board.   The ICM20600 IMU could have been used and it is slightly…"
May 6

100KM
DavidJames replied to Arunava Pal's discussion Pixhawk Versions
"The Pixhawk1(2.4.x) uses the MPU6000 IMU, a redundant set of gyros(L3GD20 3-axis 16-bit gyroscope) and accelerometers(ST Micro LSM303D 3-axis 14-bit accelerometer / magnetometer).    The MPU6000 IMU gyro noise(0.005 deg/sec/root(Hz)…"
May 6

100KM
DavidJames replied to Arunava Pal's discussion Pixhawk Versions
"Arunava,    The Pixhawk1 (2.4.8 and 2.4.9) has a slightly better IMU(lower noise gyros) than the Pixhawk 2.1.      Here is a link to the mRo Robotics autopilot store web page.    It has good descriptions of…"
May 6

100KM
DavidJames commented on Chris Anderson's blog post More powerful Pixhawk 3 coming soon
"Not sure why you would want to use the ICM-20608 IMU in a new autopiliot.    It is a poor IMU compared to the MPU6000 used in the Pixhawk and even the APM autopilot.  The ICM-20608 being used in the Pixhawk3 has noisier gyros than the…"
May 5

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

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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