Some new stuff
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Quad Copter Builds
14 Jan 2013.
Most of the quad copter parts arrived.
Still waiting for brush-less motor plate mounts and frame.
19 Feb 2013 and the frame is shipped! Also I decided to order other brushless motors.
11 April 2013 motors arrived.
1. Green and red leds mounted in frame bottom to show front and back. How to power those leds?
2. Mount go pro or similar bracket at the bottom (outside) of the frame.
3. Think of on/off switch to be mounted. Decided against that
4. What wires need to be lenghted for battery charging.Done
5. The connections of the motors towards the esc.Grommets for holes drilled? I used glue
6. Possibility of opening and re- seal the frame for better mount space, connections etc.Nope!!
7. Paint round circular patterens around the frame to show front and back-like propeller colours?
8. Make provision for a feature fiiting of augmentation equipment.
9. Mount two batteries in parallel. Done...weight??
10. Think of heat building up inside the frame...maybe front and back holes, but waterproof will be challenged.
11. By doubling up on the top plastic cover, we might increase space?
12. Nuts and bolts -use tight lock? Done
13. Vibration consequences if any?
25 April 2013
I fitted two 5000mA/H Lipo 30C batteries in parallel. I am concerned about the weight, but let us first try.
I have rebuild the quadcopter h-frame and will rebuild again with aliminium square tubing all around instead of the flat aliminium plate I am flying with now.
I have buitl my latest (fourth) attempt quadcopter. This time X-shape frame and long story short, I am happy witht the results.
Maybe 12 inch props to try.
Loiter works fine, Return to launch is working fine. Software version 3 on the ardupilot.
Motors fitted and motor wires totally hided inside the aluminium tubing towards the main piece of the copter.
Centre platform which I used to build on upwards like in next picture.
The top platform/base with the receiver, ardupilot and GPs fitted
From the top again with wiring done.
Ready for first flight
While in loiter mode
08/03/2013 and my quad copter frame arrived.
The 6 channel receiver
Quad ESC 20A
Transmitter Control Remote
Ardupilot 2.5 with 3DR GPS.
My Aqua Quad Copter Maiden Flight at Night
Aqua Quad Copter Maiden flight
Aqua Quad Copter Maiden Flight Night
Second Quad Copter
My trainer Quadcopter in flight.
These are the quad copter piccies been taken of my first aqua copter and my h-frame attempt as well as the X- frame. So it is combined attempts until my fourth quad copter with X-frame.
06 April 2015
This is most probably my eighth copter build. From the one shape to the other frame to the other version to the other flight controller.
Now I am with the pixhawk.
Frame 600 mm X frame
Motors 800KV turnigy hobbyking
3c lipo 25C
12 inch props
Telemetry, working also perfectly with TOWER android application!!
Next phase camera and fpv
But, I ended up with the following issue, keeping me busy for days and driving me insane:
After the build completion, the quad copter flew and handeled very well, still not touching trims or PID values other than default.
RTL, loiter etc all working fine. Completed missions scessfully, UNTIL:
The one day , just before retyring flying for the day, I made a big mistake. I flipped radio switches between loiter mode and rtl with the throttle down,
usesless to mention what happened.
My copter dropped out of the sky about 15 meters high. No props broken, just a few bends on the frame here and there. Got it all fixed
and back to the playground.
Then, two problems from lift off:
1. Immediate yaw to the left in stabilize mode.
Slow yaw to the left in loiter mode
2. NO yaw to the right. Rather a wobble effect, loiter mode and most probably in stabilze mode too.
Back to the bench.
1. FW upgrade
2. Recalibration of accellorometer, compass, radio etc.
Nothing changed with the next test flight.
Then back home and after inspection of the brand new motors, noticed three out of the four motors are grinding like bearings faulty.
Replaced the bearings with similar secondhand motors. Sounds great again. But at this stage already, I cant remember which motor was not serviced or did not required a new bearing!
Nevertheless, back to the playground. Stabilize lift off, immediate yaw to the left and now yaw to the right. Rather a dangerous looking wobble. Stop flying , back home to the bench again.
Google like hell! Checked the 4 in 1 ESC. Just cant get to the exact same problem, close but still not the same. yes, the bearings effect I did pick up from google and forums and should influence the yaw. Can we thus from this, assume bad bearings due to the hard fall?
Check the frame. Check the motor mounts. Check the motor mounts screws. Measure the heights, the level etc, nothing immediately telling me anything at all.
Then, for some lucky reason (still to confirm if it was lucky and working), I pulled on one front left motor body just to find the body loose from the motor frame only hold back by the magnetism, obviously telling me the shaft of the motor is loose. Removed the motor and there is no circlip!
First question to myself, was this motor serviced and if so, did I replace the circlip properly? Or did this specific motor circlip came off for some reason?
I dont know! I am confused also due to the fact, I not knowing which motor was serviced by me.
Neverthelss, got circlip from another motor lying around and fit the circlip again.
Armed the motors without props, sounds great by the ear when applying yaw stick both left and right.
Went outside, armed the quadcopter with props fitted, hold the quadcopter in my left hand while throttle and yaw to the left and right. Feels great.
I am waiting now for the lipos to get charged. Will be back on the playground and will update the above article.
06 April 2015 late afternoon
Still the same problem.
I am now so to say close to replace both the 4 in 1 esc as well as the pixhawk.
17 April 2015
Ordered a new 4 in 1 esc, ordered new motors and a new frame.
This is how frustrated I was with the previous copter not yaw to the left.
Today I am still pretty sure it was not my frame. Not motor mounts, nor bearings, but the 4 in 1 ESC was the culprit.
The closest I am getting to proof this statement, is what is been noted on the internet regarding motors which are stopped by e.g a hard fall and consequently burn the ESC outputs. That is the closest I am going to describe the yaw problem I experienced.
I am now using a 450 frame, 1200KV motors and a new 4 in 1 ESC and this thing is just awesome. SO stable from initial maiden flight. 8 inch props and all going well. No problems from the pixhawk at all.
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