Tom Mahood
  • Irvine, CA
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Tom Mahood's Discussions

Any smaller alternatives to the stock Pixhawk buzzer?

Started this discussion. Last reply by Tom Mahood Sep 17, 2014. 2 Replies

I'm interested in replacing the stock Pixhawk piezo buzzer with something smaller but after a lot of time looking, I can't seem to find any specs on it. The schematics on the Pixhawk.org website show…Continue

Need advice for imaging a steep ridgeline

Started this discussion. Last reply by Tom Mahood Aug 7, 2014. 9 Replies

I'm interested in imaging a possible archaeological site located along the spine of a fairly steep descending ridgeline and am looking for advice on how to approach the imaging. At the very least I'd…Continue

Any good GPS cameras lighter than a Canon SX230 HS?

Started this discussion. Last reply by Tom Mahood Apr 11, 2014. 4 Replies

I've been using a Canon SX230 HS on multicopters for mapping and vertical imaging. I think it does a great job and takes fantastic pictures....but it's heavy! At 220 grams it seriously shortens…Continue

Need help with difficult analysis of log for Loiter crash

Started this discussion. Last reply by Tom Mahood Feb 21, 2014. 1 Reply

I've spent the past 4 hours going through the logs of my tricopter crash with both MP and APM Planner trying to figure out why it went down and I'm stumped. I'm decent with log interpretation and try…Continue

Tags: crash, Loiter

 

Tom Mahood's Page

Latest Activity

Tom Mahood replied to Euan Ramsay's discussion Best tricopter layout
"I prefer the arrangement with the two opposing props. There will be less torque the tail rotor needs to compensate for. And if you are using an RCExplorer type servo/motor hinge, they often have limited travel before they hit their stops. I'd…"
yesterday
Tom Mahood replied to Channel Islands's discussion Pixhawk 3.2/ Futaba14SG/ CastleCreation QuadPack - Crash Take Off - Flip roll
"I'm sorry if I wasn't being clear enough. You do not calibrate Castle Creations Multirotor ESCs. They are already calibrated at the factory to have a fixed response range. The usual ESC calibration procedure on the APM wiki will not work…"
yesterday
Tom Mahood replied to Channel Islands's discussion Pixhawk 3.2/ Futaba14SG/ CastleCreation QuadPack - Crash Take Off - Flip roll
"First off, you clearly have either something mis-wired or the channel assignment on your Futaba is wrong. You'll have to straighten that out. Second, you cannot normally calibrate Castle Creations Quad Pack ESCs. They come with factory set…"
Wednesday
Tom Mahood commented on Thomas J Coyle III's blog post Secret Service: Drone that crashed on White House grounds was being used recreationally
"As much as I enjoy bashing on Phantom owners, I wonder if there is some sort of electronic defense at the White House that spoofs GPS signals? I know such devices exist. If so then the Phantom's GPS lock could have been totally hosed and it was…"
Tuesday
Tom Mahood replied to Gábor Zoltán's discussion Adding extra functions to MinimOSD
"Yep, happened to me. It looked like my entire screen was composed of repeating "crystals" except for the OSD text, which was clear. I assumed it was just a bad Minim, and replaced it. Then, after a couple of months the replacement did the…"
Jan 12
Tom Mahood replied to Jonathan Hair's discussion New hex with Pixawk trying to flip on takeoff, w/ log
"For chuckles I extracted your parameters from your log file and compared them to the parameters I currently have in a Tarot 650 running 3.2 on a Pixhawk. I specifically looked at the accel parameters. They were all reasonably close except for…"
Jan 3
Tom Mahood replied to Jonathan Hair's discussion New hex with Pixawk trying to flip on takeoff, w/ log
"Oh, OK. I assumed that was you nudging the stick for roll. If you compare motor 2 of RCOUT with Channel 1 of RCIN they pretty much match so the Pixhawk seems to be wanting to do what it's being asked. So your RC Rx must be feeding something…"
Jan 3
Tom Mahood replied to Jonathan Hair's discussion New hex with Pixawk trying to flip on takeoff, w/ log
"Your RCIN and RCOUTs look OK. Your number 2 motor is being commanded to spin a bit faster than your number one, but not a lot more in the absolute sense and it shouldn't be enough to flip it. I'm wondering if you have your ESCs calibrated…"
Jan 3
Tom Mahood replied to Eos's discussion Almost lost my copter to the great blue ocean today..
"To me it looks like you don't have your RC Rx set properly for a failsafe condition. Have a look at the attached MP plot.It shows the Desired Roll and Pitch, the actual roll and pitch, and the throttle in. Everything is looking good until about…"
Jan 2
Tom Mahood replied to David Cox's discussion Tarot Gimbal and protecting GoPro lens
"I have both the RMRC "GoProtector" and the GetFPV "Layer lens". Of the two I strongly prefer the Layer Lens, despite it being considerably more expensive. I got the GoProtector first. It's held on to the GoPro both by a…"
Dec 30, 2014
Tom Mahood replied to yugo's discussion What Freekin Motors To Buy???
"Banggood appears to have them. Sunnkysky motors for some reason are more available from Chinese sellers than US online retailers."
Dec 24, 2014
Tom Mahood replied to Sandy Sound's discussion RTL Triggered after 2 1/2, 3 mins of flight
"Personally I try to be in process of actually landing when I hit 3.5 volts per cell (10.5 for 3S). 10.8 volts gives some margin to return. Since I use an OSD I monitor the voltage myself and have my battery failsafes turned off."
Dec 23, 2014
Tom Mahood replied to Sandy Sound's discussion RTL Triggered after 2 1/2, 3 mins of flight
"You have RTL enabled for your battery at a voltage of 10.5 volts and a mAH of 983. It appears you tripped it based upon voltage."
Dec 23, 2014
Tom Mahood replied to yugo's discussion What Freekin Motors To Buy???
"These motors are essentially the same in terms of speed due to similar KV ratings. I'm normally partial to Sunnysky motors due to their quality. They are like good knockoffs of T-Motors but much less expensive. However I see the Sunnyskies come…"
Dec 22, 2014
Tom Mahood replied to FlyHigh's discussion Copter tried to kill me, Grinding noise then stuck at full throttle.
"If you look at the attached screen grab from MP you'll see that your throttle out (blue line) was tracking very closely RCIN #3 (red line). Channel 3 RCIN is what the Pixhawk is seeing coming directly from your RC Rx as the throttle signal. So…"
Dec 1, 2014
Tom Mahood commented on Hugues's blog post 433 Mhz antenna comparison - DIY & standard stock models
"So Hugues, you were using an ambient 433 MHz band signal that happened to be there and not one whose amplitude you were controlling?"
Nov 16, 2014

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Rotors and fixed wing

Tom Mahood's Blog

Personal Drones May Present Public Safety Concerns

Posted on August 29, 2013 at 10:30pm 9 Comments

...Or so says the Joint Regional Intelligence Center. JRIC is yet another anti-terrorist agency most people have never heard of and is comprised of the Feds and law enforcement agencies in the counties of Southern California. The following single page…

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A composite folding H-quad

Posted on August 21, 2013 at 12:40pm 18 Comments

I've just wrapped up a new design based upon a lot of ideas I stole found on this site.…

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Comment Wall (1 comment)

At 7:14pm on December 12, 2013, Dennis Okeefe said…

this is cool.  i was looking for how to import .kmz files into mission planner and saw your post about exporting them.  i immediately realized who you were since i am a big fan of yours - black world stuff you have posted.  are you new to this "hobby"?   it would be a useful tool for "research".  anyway, do you know if you can import data directly from google earth into mission planner?  

timmy

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