Tom Mahood
  • Irvine, CA
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Need advice for imaging a steep ridgeline

Started this discussion. Last reply by Tom Mahood Aug 7. 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. 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. 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

Not getting correct kmz files created after update of MP and 3.1 rc-7

Started this discussion. Last reply by Tom Mahood Dec 12, 2013. 2 Replies

I updated both a quad and a tricopter to 3.1 rc-7 and it appears the kmz files for the logged flights are not being written correctly. Both craft had been running 3.0.1 and creating the kmz files…Continue

 

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Latest Activity

Tom Mahood commented on Georgie xu's blog post Seawalker- A Student-Built Heavily Modified Skywalker-Seaplane
"Nice video but how about posting a picture of the aircraft itself? I'm sure people would like to see how it was done."
Saturday
Tom Mahood replied to Bim's discussion Good setup for research purposed drone?
"I think the Taranis Tx/Rx combo is an excellent choice. If I were not so far into the Futaba world, money-wise, I'd just on a Taranis. Note that the performance specs for this motor on the Foxtech site are with one of their 18x6.1 props. The…"
Friday
Tom Mahood replied to mark coleman's discussion Not enough thrust, help me out?
"Your log says you are presently hovering at around 85% throttle. It will barely fly at that high level and you have precious little extra power left over for maneuvering. You have, my friend, a flying pig. You didn't say what size props you…"
Thursday
Tom Mahood replied to Damo's discussion fpv frequency in the group ArduPlane User Group
"You can use this online calculator to estimate your reception range based upon frequency, transmitter power and types of antennas. I've found it to be reasonably accurate, if a little optimistic. I assume my range will be a bit less than…"
Sep 9
Tom Mahood replied to Sandro's discussion I need help in crash investigation
"And one other thing....A pitch up and roll right is consistent with the failure of the right rear motor. But another thing that could cause that movement would be for the front left motor to be stuck on full power. But I think a full on failure is…"
Aug 23
Tom Mahood replied to Sandro's discussion I need help in crash investigation
"Sync issues are probably rarer than most people think. And in Loiter there usually isn't the type of rapid throttle changes that cause that sort of thing. In any case if you tested your quad for 15 minutes by rapidly moving the throttle, with…"
Aug 23
Tom Mahood replied to Sandro's discussion I need help in crash investigation
"Current plotting against attitude can sometimes be misleading due to the different update rates for the parameters. The data points for current are much more spread apart than for attitude. In your plot, at 18.4 the current and roll appear normal.…"
Aug 23
Tom Mahood replied to Sandro's discussion I need help in crash investigation
"I'm going to say it was a mechanical or electrical failure on your rear right motor. Your roll and pitch outs were tracking your inputs just fine until around line 18416, when your pitch and roll started going very positive (that means pitch up…"
Aug 22
Tom Mahood replied to Francesco Bertelli's discussion [Wishlist] Auto-soft-landing on accidental throttle down
"Pretty much. That variable has been around for quite a while. Of course Position Hold is new to 3.2, but the variable applies to any guided mode, such as AltHold and Loiter. It simply caps the maximum descent rate. There are similar parameters for…"
Aug 22
Tom Mahood replied to Francesco Bertelli's discussion [Wishlist] Auto-soft-landing on accidental throttle down
"That would be the "Speed Down" parameter in the WPNav section of the "Extended Tuning" tab. You can also change it in the "Full Parameter List"  where it's listed as the WPNAV_SPEED_DOWN parameter. Same…"
Aug 21
Tom Mahood replied to Francesco Bertelli's discussion [Wishlist] Auto-soft-landing on accidental throttle down
"You already have at least two modes that do this, AltHold and PosHold, both excellent for aerial photography.  In either mode if you put the throttle to zero, accidental or otherwise, the craft will descend at its maximum allowable programmed…"
Aug 21
Tom Mahood replied to Edgar Scott's discussion Is there a way to tell if Tx loss signal initiated my RTL in the group ArduCopter User Group
"Glad it worked out. I should have mentioned that one of the very first things I do when looking at any log is to filter for ERRs and see if there's anything going on. Sometimes I'm surprised to find things I had no idea were there."
Aug 15
Tom Mahood replied to Edgar Scott's discussion Is there a way to tell if Tx loss signal initiated my RTL in the group ArduCopter User Group
"The first clue is the big red error banners on the top of the graph saying "Failsafe Radio" for a start. Another thing you can do is right click on the bar just above row 1. You'll see a Filter dialog box appear. Filter on ERR and…"
Aug 14
Tom Mahood replied to Edgar Scott's discussion Is there a way to tell if Tx loss signal initiated my RTL in the group ArduCopter User Group
"Yep, that was it. Between 1.5 to 2 minutes you had a radio failsafe three times, the first when you were about 2,260' from launch. It stayed in RTL until about 3.5 minutes when you switched it to PosHold."
Aug 13
Tom Mahood commented on Timothy Clemans's blog post Drone seized by police at Los Angeles park
"Jonathan, I fully agree with all your points except the legality. It wasn't an airspace issue and it wasn't that there were people around using their cameras, why couldn't he (his just happened to have a flying tripod)? He violated a…"
Aug 8
Tom Mahood commented on Timothy Clemans's blog post Drone seized by police at Los Angeles park
"Correct, my mistake. Actually the Port Police is the appropriate entity to deal with this. It looks like he was flying from the parking lot of the USS Iowa Museum, which is ultimately controlled by the LA Port Authority. It's not clear from the…"
Aug 7

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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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