Savage_Smithy Posted December 13, 2014 Share Posted December 13, 2014 (edited) 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 Edited December 14, 2014 by Savage_Smithy Quote Link to comment Share on other sites More sharing options...
Vr5fx Posted December 14, 2014 Share Posted December 14, 2014 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 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. Quote Link to comment Share on other sites More sharing options...
Savage_Smithy Posted December 14, 2014 Author Share Posted December 14, 2014 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 Quote Link to comment Share on other sites More sharing options...
Tamiyacowboy Posted December 17, 2014 Share Posted December 17, 2014 (edited) 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 December 17, 2014 by Tamiyacowboy Quote Link to comment Share on other sites More sharing options...
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