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Daniel's Discussions
Strange motor behaviour
Started this discussion. Last reply by Vernon Barry Aug 5, 2012. 4 Replies 0 Likes
Why are my motors doing this weird power loss when running at approx. 75% throttle ? Thrust and amps go up nicely till about 75%, then suddenly I loose a lot of thrust and the amps actually go down.…Continue
No Mavlink, but console works.
Started this discussion. Last reply by Daniel Jun 19, 2012. 5 Replies 0 Likes
I have a ArduPilot Mega 1 (red, with oilpan "shield") that after the latest firmware update (Arducopter 2.6) doesn't seem to communicate via Mavlink anymore.Symptoms so far:- Firmware upload works.-…Continue
Tags: arducopter, firmware, crash, mavlink, no
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Daniel commented on Randy's blog post Steps toward ESC feedback using SimonK"Marooned, just add a learning mode (record your baseline (while you are sure you still have all the props)) and then compare. And I was refering to this: https://www.sparkfun.com/products/9028?"
Daniel commented on Randy's blog post Steps toward ESC feedback using SimonK"Wouldn't it be possible to compare the overall apms (as detected by attopilot sensor) to an "normal" amp use for a given rpm setting (for all motors) to detect a missing prop ?
I know, still doesnt tell you which one is missing, but…"
Daniel replied to R_Lefebvre's discussion XBee airborne side antenna, how to replace?"I assume variation in manufacturing."
Daniel replied to R_Lefebvre's discussion XBee airborne side antenna, how to replace?"Which calculator thing did you use ? I used four different ones on the web and came back with the same…"
Daniel replied to R_Lefebvre's discussion XBee airborne side antenna, how to replace?"Quarter wave for the frequency's used by the 900 xBee is between 80mm and 83mm. (902 MHz-928MHz)"
Daniel commented on narwhal's blog post Foreign Correspondent (ABC Documentary)"I might have found it on the internet: http://www.slingfile.com/file/ZENvhyDwR0"
Daniel commented on Hooks's blog post New 5.8 Ghz wireless video system 1200mW Long Range"Data in ? (in the picture)
"
Vernon Barry replied to Daniel's discussion Strange motor behaviour"Right, so it's what I said, you have a faulty (AKA rating is higher than what it puts out) pack. Maybe it's only one cell that is weak, but the pack is not capable of providing power (constant Voltage and…"
Daniel replied to Daniel's discussion Strange motor behaviour"Just checked, voltage direct on the ESC looks fine till the weird stuff begins.
And as soon as I drop the throttle, it's immediately is fine again (can't be resistance, can it ?)
"
Daniel replied to Daniel's discussion Strange motor behaviour"The battery in the video is a 5000mah, rated at 20C. I pull at the time no more than 20 amps, i.e. 4C."
Vernon Barry replied to Daniel's discussion Strange motor behaviour"First, don't believe the battery rating. Burst is not the same as continous. This is most likely the culprit.
What battery exactly are you using? I got the feeling the ratings are way out of whack."
Daniel posted a discussionStrange motor behaviour
Why are my motors doing this weird power loss when running at approx. 75% throttle ? Thrust and amps go up nicely till about 75%, then suddenly I loose a lot of thrust and the amps actually go down. Please see attached video for a better understanding.(This is done while bypassing the APM, and with a 100 amp capable battery, the ESC is rated to 25 amp, and my wattmeter never shows more than 25 amp (approx. 15 amp when the issue starts))See More
Daniel replied to Daniel's discussion No Mavlink, but console works."Thanks, that's it.
I feel like an idiot now. Guess I should read the changelog before applying firmware updates."
gzebedin replied to Daniel's discussion No Mavlink, but console works."SOOO EASY!!! Thanks! I was searching for this for one day now! :-)
THANKS"
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