Jan 20, 2013, 08:43 AM
Registered User
France, RA, Bossey
Joined May 2011
50 Posts
Quote:
 Originally Posted by Mr_westie From post http://www.rcgroups.com/forums/showt...8#post23842548 Crash analysis.... We are looking at a 6 second window. Crash starts in the middle. 1. Something happens causing the shake value to shoot up. 2. The shake corrupts the Altitude estimation. X_Veld 3. The FC tries to correct the nose falling with back elevator. Due to the high shake I can't tell when it hits the ground. Being only 10m up it would not have taken long. 4. My best guess of when it hits the ground. So what happened? No known crash conditions from the YS. Most likely a broken prop as the owner suspected. Stock DJI 10x4.5.
Thank you for having taken the time to make this detailed analysis. It teached me a lot on the way of doing a flight analysis. There are a lot of things I didn't notice, and parameters I didn't pay attention to when I tried to understand the reasons of the crash.
I had some complementary questions for my understanding:
-How to you calculate the time i.e.how did you locate the last 6 seconds?
Is it by calculating a number of points per second?
-One other cause of the crash could have been a motor cut (or power cut) due to a miscontact which could have generated the big shake.
If it was the case would one have been in a position to notice it through the curves?
Last edited by apache74; Jan 22, 2013 at 04:06 PM.
 Jan 20, 2013, 01:08 PM Down under under New Zealand, Auckland Joined Nov 2007 613 Posts Time, 5hz logging. 5 points = 1 second You then manually set the viewport, Min.Max X Motor cut may not have the shake as you would just loose power from that motor. When a prop breaks there is great imbalance. Would also notice a rise in voltage as the load decreased on the system. A current sensor would help show that too. http://www.rcgroups.com/forums/showt...r#post23264290 If someone had a scrap quad and some tall grass they could test all crash conditions and log for our benefit
 Jan 22, 2013, 04:03 PM Registered User United States, NH, Barrington Joined Sep 2011 251 Posts Anyone know what might be causing my elevator and aileron to be crossed? I am using the bus interface from FC to FySky receiver. I had this exact same configuration set up on a Steadi470 and it was fine. I have moved the YS-X6 to another quad that I am testing and have this issue. Everything looks ok on the tablet data - I move elevator and it changes values. Move aileron and those values move. Checked the assignment of channels on the transmitter (futaba) and it is ok. Maybe I just have a brain cramp - something I forgot to do when I moved the FC? Update for anyone who might benefit from my stupidity! I had mismarked my motor/esc connectors and simply had two of them plugged in to the wrong assignment. Flipped those and everything works fine now. Now just wait for the wind to die down and try a test flight. Last edited by Socratic; Jan 23, 2013 at 09:52 AM. Reason: Update
 Jan 24, 2013, 02:35 PM Registered User Mozambique, Maputo City, Maputo Joined Sep 2012 38 Posts best quadcopter to lift 4,5 Kg AUW with the longest possible flight time Hi, I am trying to understand how to fly a multirotor with a 2 kg. payload (including two 5.000 mAh batteries, a 700 gr. HDR and a 300 gr. FPV system) for 12 to 15 minutes. To keep the AUW as low as possible, I think that I have to use a quadcopter instead of an hexacopter. These are my findings: RCTiger 3515 KV 650 x 4: 188 gr. x 4 = 752 gr. ESC 40A x 4: 35 gr. x 4 = 140 gr.: CF props 14x4.7 x 4: 25 gr. x 4 = 100 gr. FC YS-X6: 212 gr. 2 axis camera mount with servo and landing skid: 600 gr. 5.000 mAh 4s x 2: 500 gr. x 2 = 1.000 gr. FPV system: 250 gr. Camera or HDR: 700 gr. Total weight without frame is 3.754 gr. I still didn't find a foldable quadcopter that could be used with the item described above weighing no more than 700 gr. so that could support an AUW of 4.5 kg. Any suggestion for a good quadcopter? Will 10.000 mAh keep the quadcopter flying for 12 to 15 minutes with that weight? What could be a good alternative?
Jan 24, 2013, 05:53 PM
Registered User
Indonesia, Special Capital Region of Jakarta, Jakarta
Joined Jan 2011
1,668 Posts
Quote:
 Originally Posted by Socratic Anyone know what might be causing my elevator and aileron to be crossed? I am using the bus interface from FC to FySky receiver. I had this exact same configuration set up on a Steadi470 and it was fine. I have moved the YS-X6 to another quad that I am testing and have this issue. Everything looks ok on the tablet data - I move elevator and it changes values. Move aileron and those values move. Checked the assignment of channels on the transmitter (futaba) and it is ok. Maybe I just have a brain cramp - something I forgot to do when I moved the FC? Update for anyone who might benefit from my stupidity! I had mismarked my motor/esc connectors and simply had two of them plugged in to the wrong assignment. Flipped those and everything works fine now. Now just wait for the wind to die down and try a test flight.
good to hear that you got it sorted. I always run motor rotation tests when completing a new built.
Jan 24, 2013, 06:57 PM
Registered User
United States, NH, Barrington
Joined Sep 2011
251 Posts
Quote:
 Originally Posted by fajar good to hear that you got it sorted. I always run motor rotation tests when completing a new built.
Good advice. I actually did run a test to be sure the motors were spinning in the correct direction - they were. But unfortunately, #3 and #1 were crossed! Same direction but different control input. It cost me 4 props. Live and learn.
Jan 24, 2013, 09:51 PM
Registered User
United States, MN, St Cloud
Joined Jan 2012
870 Posts
Quote:
 Originally Posted by archet Hi, I am trying to understand how to fly a multirotor with a 2 kg. payload (including two 5.000 mAh batteries, a 700 gr. HDR and a 300 gr. FPV system) for 12 to 15 minutes. To keep the AUW as low as possible, I think that I have to use a quadcopter instead of an hexacopter. These are my findings: RCTiger 3515 KV 650 x 4: 188 gr. x 4 = 752 gr. ESC 40A x 4: 35 gr. x 4 = 140 gr.: CF props 14x4.7 x 4: 25 gr. x 4 = 100 gr. FC YS-X6: 212 gr. 2 axis camera mount with servo and landing skid: 600 gr. 5.000 mAh 4s x 2: 500 gr. x 2 = 1.000 gr. FPV system: 250 gr. Camera or HDR: 700 gr. Total weight without frame is 3.754 gr. I still didn't find a foldable quadcopter that could be used with the item described above weighing no more than 700 gr. so that could support an AUW of 4.5 kg. Any suggestion for a good quadcopter? Will 10.000 mAh keep the quadcopter flying for 12 to 15 minutes with that weight? What could be a good alternative?
I get 10 minutes with my hex with Avroto 2/14 motors and a Sony PJ710.
 Jan 24, 2013, 11:27 PM Wish i was a flight pack Australia, NSW, Bass Hill Joined Jan 2012 333 Posts Socratic. Interesting, thanks for sharing !
Jan 25, 2013, 08:27 AM
Registered User
Mozambique, Maputo City, Maputo
Joined Sep 2012
38 Posts
Quote:
 Originally Posted by richkphoto I get 10 minutes with my hex with Avroto 2/14 motors and a Sony PJ710.
What is the AUW of the hexacopter wit the sony HDR?

In the specifications for RCTiger motors they indicate the percentage of power and the corresponding thrust.
For example, at 50% the thrust of one motor is 800 gr., at 65% is 1050gr. and so on.

What should be the percentage of power to take into account for the AUW of the multicopter? At what percentage of motor's power should the multicopter hover to avoid overloading the motors?
Jan 25, 2013, 10:07 AM
Registered User
South Africa, GP, Johannesburg
Joined Sep 2010
2,495 Posts
Quote:
 Originally Posted by archet What is the AUW of the hexacopter wit the sony HDR? In the specifications for RCTiger motors they indicate the percentage of power and the corresponding thrust. For example, at 50% the thrust of one motor is 800 gr., at 65% is 1050gr. and so on. What should be the percentage of power to take into account for the AUW of the multicopter? At what percentage of motor's power should the multicopter hover to avoid overloading the motors?
To work out your AUW, take 50% of the max thrust of each motor X no of motors and that will tell you what the total system will carry. But if you are flying hard and fast rather use eCalc to look at different scenarios.
Jan 25, 2013, 10:14 AM
RTF copters maker
South France
Joined Jan 2008
1,186 Posts

 QUADRYCOPTER YS-X6 (1 min 3 sec)
 Jan 25, 2013, 07:02 PM Registered User Spain, CN Joined Dec 2011 312 Posts Did anybody try the latest firmware?
Jan 25, 2013, 09:01 PM
Registered User
United States, MN, St Cloud
Joined Jan 2012
870 Posts
Quote:
 Originally Posted by apejovic Did anybody try the latest firmware?
Do you mean the one that came out in December?
Jan 26, 2013, 05:20 AM
Registered User
Spain, CN
Joined Dec 2011
312 Posts
Quote:
 Originally Posted by richkphoto Do you mean the one that came out in December?
No the Last one realesed this january. My spanish dealer has it online, seems it comes with an improved algorithm offering more stability

I will try it on monday.
Jan 26, 2013, 10:11 AM
Registered User
Singapore, Singapore
Joined Oct 2012
150 Posts
Quote:
 Originally Posted by Mr_westie From post http://www.rcgroups.com/forums/showt...8#post23842548 1. Something happens causing the shake value to shoot up. 2. The shake corrupts the Altitude estimation. X_Veld 3. The FC tries to correct the nose falling with back elevator. Due to the high shake I can't tell when it hits the ground. So what happened? No known crash conditions from the YS.

Quote:
 Originally Posted by apache74 -One other cause of the crash could have been a motor cut (or power cut) due to a miscontact which could have generated the big shake. If it was the case would one have been in a position to notice it through the curves?
I had exactly the same experience today.. Towards near the end of battery life suddenly I noticed horizontal unstability of my FY680 @ GPS hold , it was moving forwards and backwards within 2 meter range. I noticed my shake values increasing so I intended to land so I put to Manual mode, then it became uncontrollable. Lucky enough my copter was 1 meter from the ground when it went fast forward nose down so I had to cut the throttle just before it hit the ground. I had my GPS scratched, no broken carbon fiber propeller.. whewww!!

I would agree with Apache74 about loose contact because I had noticed the my battery connector a bit loose when I plugged in to my copter. I never use connectors on my ESC, they are all soldered straight. First time it happened to me. Later on I tested again and it was normal again.. Very lucky it never occurred when my copter was 20 meter on air.