Tom Moore
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Help diagnose a motor speed issue on Pixhawk please!!

Started this discussion. Last reply by Andre K. Feb 26. 9 Replies

Hi All,Hope I'm putting this in the right forum to start off with.I'm having a problem with the speed of a motor on a quad using a Pixhawk. It's motor 3, it's slower than the rest. Noticeable…Continue

V-tail sizing example - but is it correct?

Started this discussion. Last reply by Jonathan Wong Aug 11, 2016. 6 Replies

Hi guys,I'm currently designing a kind of motor glider (ish) and am planning on using a v-tail.I wanted to ask your opinion on the sizing of the tail that I've come up with and I'll run through some…Continue

Uneven motor load for copter setup?

Started this discussion. Last reply by Tom Moore Jun 17, 2016. 1 Reply

Hi guys,There's a few issues I'd like to bring up here.Here's the background: just loaded copter onto Pixhawk and plugged it into a quad frame (had it in the frame before but used the Pixhawk in a…Continue

Endurance design spec? - help please!

Started Jun 14, 2016 0 Replies

Hi all,I'm looking for a motor/prop combination that will give me good endurance (over 45 minutes flying times) on my model. It seems like something along the lines of a relatively low KV motor…Continue

 

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Latest Activity

Andre K. replied to Tom Moore's discussion Help diagnose a motor speed issue on Pixhawk please!!
"Yes, it sounds like all are calibrated. Be sure that every motor is on the correct output, with correct propeller direction.  once you arm (and throttle is in the regulated zone - not spinning just due to MOT_SPIN_ARMED)   - then RPM of…"
Feb 26
Tom Moore replied to Tom Moore's discussion Help diagnose a motor speed issue on Pixhawk please!!
"Thank you for the replies, your help is really appreciated! I've calibrated the ESCs using the transmitter method and then, when I wasn't sure that had worked, the automatic method. I'll go through it again and see if there's an…"
Feb 26
Andre K. replied to Tom Moore's discussion Help diagnose a motor speed issue on Pixhawk please!!
"I see I wrote set RC3 ....  that was just meant to confirm your setup was normal. also - "make sure ESC's are calibrated"  first,   if they ARE , and still very uneven RPM when level,  then the rest will give a…"
Feb 25
Crady von Pawlak replied to Tom Moore's discussion Help diagnose a motor speed issue on Pixhawk please!!
"No special setup required however, ESC calibration is critical (see Andre K's reply).  These links should help if you haven't performed an ESC calibration or aren't sure if it was done…"
Feb 25
Andre K. replied to Tom Moore's discussion Help diagnose a motor speed issue on Pixhawk please!!
"set RC3_MIN == RC3_TRIM make sure ESC's are calibrated set MOT_SPIN_ARMED,40 .... 60 ... 80  ... maybe even 100   (some at a time) , and arm.    you want to see ok RPM, but be far from takeoff.…"
Feb 25
Tom Moore replied to Tom Moore's discussion Help diagnose a motor speed issue on Pixhawk please!!
"Hi Andre, Thanks for the reply. I can't take off due to the motor issue. It's very noticeable on the ground. When trying to take off the quad tilts forward and the props impact the ground. Can post a bin file of on the ground testing…"
Feb 25
Andre K. replied to Tom Moore's discussion Help diagnose a motor speed issue on Pixhawk please!!
"I assume you are actually hovering when testing ?  - or are you one of those that expect this to work in a dry-test ? Post a .BIN log of:  in no or weak little wind:  takeoff,  hover at ~2meter for 10 seconds, land. "
Feb 25
Tom Moore replied to Tom Moore's discussion Help diagnose a motor speed issue on Pixhawk please!!
"Hi Crady, Thank you for the reply. I'm really struggling to fix this so any help would be really appreciated. I've gone through the setup for the joystick and re-calibrated the accelerometers. I did notice that the horizon had drifted…"
Feb 25
Crady von Pawlak replied to Tom Moore's discussion Help diagnose a motor speed issue on Pixhawk please!!
"From your description it sounds like a miscalibration of your PS4, the Pixhawk's accelerometers or…"
Feb 24
Tom Moore posted a discussion

Help diagnose a motor speed issue on Pixhawk please!!

Hi All,Hope I'm putting this in the right forum to start off with.I'm having a problem with the speed of a motor on a quad using a Pixhawk. It's motor 3, it's slower than the rest. Noticeable particularly at low RPMs. The interesting thing is when I swap around the ESC signal wires from the other motors into Main Out 3 (where motor 3 is usually plugged into) I get the same issue with the other motors.I'm using a PS4 controller over the telemetry link (as I don't have my usual Tx with me right…See More
Feb 24
Tom Moore commented on Hugues's blog post 1h:15min flight time - Airbotservices X4 with brushless gimbal & fullHD camera on 12mm rail system
"Hughes, great post, thank you for sharing. I have a couple of questions if you don't mind taking a look: I was hoping to find a little more out about the battery. It seems to have an excellent energy density. I presume it's made of 18650…"
Oct 25, 2016
Jonathan Wong replied to Tom Moore's discussion V-tail sizing example - but is it correct?
"Absolutely. Stick a rocket on a barn door and it'll fly for too. The engineering comes in when one tries to optimize the design to make it work well and efficiently."
Aug 11, 2016
Jonathan Wong replied to Tom Moore's discussion V-tail sizing example - but is it correct?
"Perhaps you might want to do some flight testing? I'm also designing a UAV while keeping in mind modularity which makes it extremely easy to make modifications with minimal cost. For example, a carbon fiber tail boom tubes and be shortened if…"
Aug 11, 2016
Tom Moore replied to Tom Moore's discussion Newbie asking for some Pixhawk help! in the group PIXHAWK
"Hi Harry and Evan, Thank you for the messages and your thoughts on the issues. In relation to the issues listed above: 1. Compass errors - The compass was set up relative (its attitude) to the Pixhawk and not the air frame. After speaking with 3DR…"
Aug 4, 2016
Evan Palmer replied to Tom Moore's discussion Newbie asking for some Pixhawk help! in the group PIXHAWK
"Tom, From what I have seen, the compass errors and velocity variance errors you are receiving could be a result of not having a GPS lock. I also had these issues when first starting, and that was the issue. I had one GPS module giving…"
Jul 28, 2016
Harry Courter replied to Tom Moore's discussion Newbie asking for some Pixhawk help! in the group PIXHAWK
"Tom, I use Pixhawk for a multirotor, not a plane, however the messages you quote have appeared for me also. In my case these types of messages show up PRIOR to gpx fix and arming.  Once armed the messages settle down and go away."
Jul 28, 2016

Profile Information

About Me:
Interested beginner RC flyer. Finished my first quadcopter recently and loving using it.
Please tell us a bit about your UAV interest
Inspired by www.conservationdrones.org and looking for other potential uses
Hometown:
London, UK

Comment Wall (1 comment)

At 2:17pm on June 15, 2016,
Moderator
keeyen pang
said…
Hi Tom

The basic info is in my blog post there. For endurance flight, the key components is the Li Ion battery. Just drop me a line should you need further info.

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