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mini apm + tricopter problems


Savage_Smithy

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hi, I have just finished building a mini tricopter and it isn't flying, it just rotates around its rear motor clockwise. not sure if there is a setting somewhere to adjust the amount of compensation but i cant find it.

 

secondly I have an apm issue that i have encountered before but couldn't find a solution. when i try to connect in the terminal i just get a bunch of crap on the screen, it works fine with my other full size apm but this mini doesn't seem to play ball. I have seen this problem on a friends full size apm too and we weren't able to fix it or work out why it happens even after several firmware reloads.

 

edit: turns out the command line interface was removed in the latest firmware due to storage space restraints.

 

if you have any ideas help would be appreciated

 

cheers

smithy :thumbsup:

 

1k88XBI.jpg

Edited by Savage_Smithy
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I used to fly Tricopters (one model but many variations) , but moved away because they are just pants.

By standard (not everyone follows) 2 motors clockwise and one counter;

Motor one, front left : Clockwise

Motor two , front right : Counter

Motor three , rear : clockwise. Or change for counter.

 

I've not flown APM, or even heard of it, but have you tried tilting motor one or two to counter the movement on the rear axis? So if it rotates clockwise, tilt motor one and two to the left slightly. Tricopter woes  :thumbsup: 

Alternatively, adjust the servo on the rear. The servo will always have tilt on throttle, to counter the one odd motor rotation. 

 

I loved my tricopter, but it was always hard work to fly, then changed to a quadcopter layout and not looked back. :whistling:

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i have had a quadcopter and currently have a hexacopter so i just wanted to try a tricopter as a mini fpv platform

current setup is all 3 motors counter clockwise as the apm guide suggests, through a bit of messing the rotation seems to have subsided and i can get it in the air now but it wobbles like hell and seems to get progressively worse until its uncontrolable

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k smithy 

 

if your airborne but your seeing massive osscilation the PID's are way out.

 

adjusting your PID sensativity will bring down the osscilations, they happen and get progressive worse because

your FC is reading errors and trying to rework them for a none error. as the quad sees more errors the FC starts to work its gubbinz 

problem is if we adjust the error all we are doing is feeding it back into the loop but with even more of an error added.

 

now the PID, think of them as low medium and high, if we see a low error we will make small correction, if we see a medium error

we make a medium correction. the PID,s are like the instruction, we set a P to 3.9 , its instructing the fc that when it sees this number everything should be bam on the nail.

its like this is the error amount you need to adjust by.

 

because we have three PID they balance and compliment each other P to I to D, if we adjust P we may need to adjust I and again may need to adjust D so they all

feel less error. when PID are tuned right those osscilations drop away to a steady stable error and its removed, the quad flys perfectly plumb die and hovers in a stable manner.

 

i would say your going to need to adjust the PID, but also pay some note to your rudder setting to . 

Edited by Tamiyacowboy
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