I have been trying to build a big Quadcopter and Tri Copter..... not easy. I have these for parts:
(4) Turnigy 25 (710kv)
(4) Red Brick 50a opto ESC
(2) Sky Lipo 14.8 40C 4000mah batteries
(2 and 2) 13x6.5 APC thin props... pusher and regular
KK Black Board bought from eBay for 24.99.... you may know the one
Well for the quad copter I get all the parts to together....using PVC.... but when I power up 3 motors spin and the third kinda jitters.... I calibrated everthing as far as I know.... oh wait.... I had this thing in the air before for about 4 seconds.... here are my videos..... HELP
Can I put a extension from the power supply to the ESC?
Per Castle Creations, they recommend no keeping the connection between the battery and ESC shortest. 30cm or so is the longest they recommend. There is no limit on how long you can make the leads to the motor, except you will have less power the longer they are. You may look at the specs for your ESC. There may have issues using with that controller such as autodetect of throttle position. I find that fixed throttle settings is best ... you can change that in sub-option 2. The fact that only one is giving you problems makes me think you either have a cold solder joint or a bad ESC or Motor. Try switching them around.
Hope this helps,
Interesting. My understanding is that the ESC to Motor connections need to be short because they are carrying high frequency PWM AC voltages with back EMF detection etc. The ESC to Battery connections are much less critical because they are simply carrying a DC current.
Regardless, both of them need to use heavy gauge wires because of the currents involved.
Probably just a bad connection between motor and ESC causing the jittering.
However, it seemed to fly OK when you had it in the air for that 4 second period ... until an arm came off.
Seems to me your main problem is the unglued PVC joints. There's going to be a lot of torque from those big motors and props. You really have to glue all the joints. If you need to pull it apart for transport, then leave one joint in each arm unglued, but pin it with a self-tapping screw that you can easily remove.
Otherwise, it looks very promising.
So as it turns out..... while working on my quad I took my motors off and put them on my Tricopter..... but I put one on the back of my truck....wife left this morning .... motor fell of and was ran over :(.... so for now working on the TRI. Hooked the ESC close to the motor and everything seems ok. Its made out of wood and having trouble with the YAW mechanism. Any ideas.... has to support a 25 size Turnigy motor. I tried the two nose wheel holders idea with no success. Then of course before the wife calls me in for dinner I was playing around with it and the thing just wouldn't level out with all he sub trimming I was doing.... KK board was positioned in the wrong direction.... :) Back to work on it tomorrow. Pictures are of the ROUGH DRAFT......
SO I have the Tri kinda running..... here is my problem now..... I throttle up and it starts spinning to the right..... so fix the rudder trim right......spins in the other direction..... I keep trimming but it dosnt want to stay centered. So I noticed that when the throttle goes up the servo pushes in one direction ???? So I held the the Tri down and throttled up...... to my surprise when I let go it didn't yaw to much like before????????? Any suggestions? Also my YAW mechanism is not the best.... any suggestion......