About

Gender

Male


Location

Madison, WI


About Me:

Newcomer to fixed-wing UAV.


Please tell us a bit about your UAV interest

Interested in home-built/DYI fixed wing UAVs that can be used in college-level instruction and research.


Hometown:

Madison, WI


Activity Feed

Grant Petty replied to Ken Wilkins's discussion Need advice on equipment in Pixhawk 2 User Group
"If you're willing to connect a Raspberry Pi to the Telem2 port and read the MAVLink messages using dronekit (this requires a little programming), then you can record the changing pressure vs. time, which will give a pretty accurate descent rate with…"
Aug 21, 2018
Grant Petty replied to Grant Petty's discussion Minimal example of passing decoded MavProxy data to another program?
"Welp, I didn't get any answers here, but I'll report for the benefit of others that MavProxy turned out not to be the solution to my problem but rather the dronekit module, which got me to the point of running a working demo program in about an hour."
Jun 4, 2018
Grant Petty posted a discussion
I'm new to MavProxy (and to MavLink data in general) but just succeeded in installing it and running it interactively on a Raspberry Pi physically connected to the Telem2 port on a Pixhawk2.1/Cube.  My question now is how I can non-interactively  (a…
Jun 1, 2018
Grant Petty replied to Grant Petty's discussion Has anyone assembled this fixed-wing UAV airframe (Hugin 2.6m)?
"Ted,
We've only flown it once! For me, a relatively new RC pilot, it was a "holding the tiger by its tail" kind of moment, and I was glad to have a more experienced pilot at the controls. As you noted, the aircraft is fast and needs a lot of runway,…"
May 24, 2018
Grant Petty replied to Grant Petty's discussion DIY catapult for 2.6m fixed-wing?
"Here's a better link focusing more on the bungee launcher: https://www.youtube.com/watch?v=xDwImUzHHkM"
May 11, 2018
Grant Petty replied to Grant Petty's discussion DIY catapult for 2.6m fixed-wing?
"Great points. Looking forward to seeing your new product when it comes out.

BTW,here's a video I just found of a bungee launcher that seems to do a nice job with the Skywalker X8: https://www.youtube.com/watch?v=PqEESKzy_iQ"
May 11, 2018
Grant Petty replied to Grant Petty's discussion DIY catapult for 2.6m fixed-wing?
"David,
Thanks for the additional comments and info.  A couple of quick comments/questions for now:

1)  Is this the Skywalker X8 you're talking about?  https://hobbyking.com/en_us/skywalker-x-8-fpv-uav-flying-wing-2120m... I've seen videos of this b…"
May 11, 2018
Grant Petty replied to Grant Petty's discussion DIY catapult for 2.6m fixed-wing?
"I'm not quite sure where the 3G comes from if my target airspeed is, say, 15 m/sec (about 30 knots).  In that case, a 1G acceleration should accomplish that over about 10 meters.   3G over 10 meters would give three times the energy, or 24.3 m/sec (…"
May 10, 2018
Grant Petty replied to Grant Petty's discussion DIY catapult for 2.6m fixed-wing?
"Very helpful information; thank you very much.
I'll add that I had been thinking about a relatively long track so as to greatly reduce the required g-forces.  As a starting point, I believe a 10-meter track (still greatly reduced compared to the nor…"
May 10, 2018
Grant Petty replied to Timothy's discussion Pixhawk 2.1 Throttle Calibration not working - motors wont spin need help! in Pixhawk 2 User Group
"Tim - It's the X8R! "
May 9, 2018
Grant Petty posted a discussion
I built a largish fixed-wing UAV (Hugin 2.6m, roughly 8 kg MTOW if I recall).  It's definitely too large to hand launch, and it needs a surprisingly long takeoff run (especially on grass) to get airborne and clear of trees etc.  This is fine when I…
May 9, 2018
Grant Petty replied to Timothy's discussion Pixhawk 2.1 Throttle Calibration not working - motors wont spin need help! in Pixhawk 2 User Group
"Looks like you're not getting anything from the RC receiver.  I had this problem recently too, but intermittently. Fortunately, I had a spare receiver laying around, and when I replaced it, the problem went away.  That led me to conclude that it was…"
May 9, 2018
Grant Petty posted a discussion
Just unpacked a new 3s 1500mah LiPo I ordered from banggood.  It arrived a month or so ago, but I only now got around to using it.  I also got a second identical battery at the same time, which is fine.Upon hooking this one up to my B6AC charger, I…
Apr 25, 2018
Grant Petty posted discussions
Apr 5, 2018
Grant Petty replied to Grant Petty's discussion Has anyone assembled this fixed-wing UAV airframe (Hugin 2.6m)?
"Update:  After many long delays (most related to other projects I'm tied up with), I am getting close to having the Hugin 2.6m flight-ready.  BUT ...
With it now fully assembled, including electronics, and sitting on a table, I'm unsettled by the fo…"
Nov 5, 2017
Grant Petty posted a discussion
I'm intrigued by the possible applications of underwater drones, but as someone new to this subject, I'm clueless as to how navigation is managed for a vehicle that remains submerged for any length of time.  I assume magnetic orientation is availabl…
Sep 24, 2017
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