Replies to This Discussion

Permalink Reply by Rui Manuel Cravo Marques on August 17, 2011 at 2:00pm

Hi. Have you checked that you don't have any prop upside down ? Each prop has a up side and a down side, usually the up side is where the letters with the reference of the prop are. To have a ccw and a cw, it's not a matter of flipping one prop, they are specific for cw and ccw, the profile is not symetric, if looked from a side, the blade looks like a plane wing. Another thing, check that you don't have an ESC with brake on configuration. Check your ESC manual about "brake" function. If one or two have the "brake on" and the others have "brake off", the propellers will react different, and it could be the cause. Hope to have helped.

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Permalink Reply by Dane on August 17, 2011 at 2:07pm

Props are identical to the diagram in 

 

http://ardupilot-mega.googlecode.com/svn/ArduPilotMegaImages/props_orientation.jpg

 

I will load up the programmer on each ESC and see what I find. I saw you once had this problem as well. Thanks for the help.

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ModeratorPermalink Reply by John Church on August 17, 2011 at 2:21pm

Can you post a pic real quick of your quad? I know you've gone over the props, but, you know...  ;)

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Permalink Reply by Dane on August 17, 2011 at 2:55pm

np

Attachments:

• IMG_7349.JPG, 5.9 MB
• IMG_7351.JPG, 6.9 MB
• IMG_7350.JPG, 6.9 MB

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Permalink Reply by chris g on August 17, 2011 at 3:21pm

if the hitec rx is like futaba/jr
your throttle and elevator are wrong

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Permalink Reply by chris g on August 17, 2011 at 2:43pm

could be several things:

1) your accelerometer offsets were not set (in CLI or Mission Planner)

2) your motors/props are spinning in the correct direction, but ESCs are connected to the APM in the wrong order. 

3) your APM is mounted in X mode but firmware is in + mode (or vice versa)

 

I'm inclined to think it is #2 or #3

if #2 turns out to be the case, be sure to check to make sure you have the correct prop and motor orientation again as it may be changed!

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Permalink Reply by Sebastian Gralla on August 17, 2011 at 3:06pm

to calibrate the accelerometers:

place it on a level surface and hold disarm for 10+ seconds, you will see the lights flash

-> calibrated :)

 

do that first

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Permalink Reply by Dane on August 17, 2011 at 3:58pm

Radio
----------------------------------------
CH1: 1116 | 1917
CH2: 1119 | 1919
CH3: 997 | 2038
CH4: 996 | 2035
CH5: 1115 | 1920
CH6: 1113 | 1913
CH7: 1499 | 1499

Quad frame
X mode

Motors

level

Sonar
enabled

Mag Dec: 12.3965
Mag offsets: -50.3366, -8.3673, -24.3040

Motors command just displayed some very interesting behavior. The first time I ran it, I would hit roll left and both left motors would turn on, pitch forward, forward motors run, roll right, right motors run, pitch back, back motors ran.

Then the second time I ran motors after redoing my radio in CLI again and the motors ran completely different. This time each corner I would push the stick, the motor would run in that corner rather than the behavior before of both motors running. Another time I would push the gimbal back right the right motor would go and the left motor would startup after 3-10 seconds at varying timing. I took video of all this if it doesn't make sense. Let me know if you guys would like it uploaded.

Attachments:

• level.JPG, 15 KB

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Permalink Reply by Dane on August 17, 2011 at 4:53pm

Odd behavior video:

 

http://www.youtube.com/watch?v=_eLztrlzcUo

 

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Permalink Reply by Rui Manuel Cravo Marques on August 17, 2011 at 5:10pm

I Dane, I've been watching your video, the "motors" show that all motors are in their propper sequence connected to the APM, however, when at the beginning you try to level the quad via tx stick, it looks like it's arming and not leveling, I believe you have to reverse the yaw control. When you call the "level" with the tx, the APM should continue to blink both green and red for a couple of seconds (+/- 10) and then make the rebooting sequence, with all led off and next quick blink on both until it blinks normally. Yours is not making that, it looks like it's arming, making me believe you must reverse yaw stick.

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Permalink Reply by Dane on August 17, 2011 at 5:42pm

The Yaw is indeed reversed. When flying during the first video, I found it was rotating the wrong way so I had to reverse it. I will put it back to normal and try to get the behavior you describe.

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Permalink Reply by Rui Manuel Cravo Marques on August 17, 2011 at 5:15pm

One way to see if you have brake active on any of the ESCs, would be to remove the props, arm the motors, give full throttle, and then get the trhottle down quickly and see if the motors all stop at the same time or if any of them keep spinning while others are already stopped. It's normal to have some 1/2 second difference in timings, more than that could show that you may have brake active on the ones wich stopped first.

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