Spin & crashed!

sar104

Dic mihi solum facta, domina.
Premium Pilot
Joined
Mar 22, 2014
Messages
5,305
Reaction score
2,700
Location
Los Alamos, NM.
Thats the answer I was looking for. Wasn't 100% certain of the reason for the max PWM and motor slow down causing the spin. And agreed on the app messages as well. BTW, did you look at the event log? Specifically the first line here. Landing? Just curious. The remainder is after the crash I believe.

View attachment 115540

That's just referring to the RC command that stopped the motors.
 

Fly Dawg

"Electricity is really just organized lightning"
Premium Pilot
Joined
Apr 29, 2016
Messages
4,659
Reaction score
2,077
Location
Watkinsville, Georgia
That's just referring to the RC command that stopped the motors.
I understand that, but there were 2 commands issued. Apparently only the second one worked. Point being is that the aircraft was already on the ground upside down when they were issued. Just looked odd....
 

Fly Dawg

"Electricity is really just organized lightning"
Premium Pilot
Joined
Apr 29, 2016
Messages
4,659
Reaction score
2,077
Location
Watkinsville, Georgia
sar104, what does PPMrecv stand for/mean in the CsvView Motor menu please?
You need to do your own acronym research. PPM ( Pulse Position Modulation ).
 
Joined
Nov 1, 2018
Messages
978
Reaction score
466
Age
82
Ahh, thanks for that. I've always understood that ESC's operate utilising PWM (Pulse Width Modulation), when I was in electronics in the Navy they certainly did. not PPM which until now, as you realise, I'd not heard of!

Having now read about the two a bit more light has gleamed!

Waveform-representation-of-PPM-signal.jpg


So with that gem of information and plotting the PPM signals to the motors, at the time of the in vitiation of the "falling" out of the sky at about 42secs, the front left pulses suddenly went to 100, maximin, and stayed there until ground contact. To me this would lean towards the ESC rather than the motor.
At 43.6sec the right back also started to get very erratic, presumably trying to compensate for the LF behaviour???

Screenshot 2019-11-11 at 22.09.06.png


Your thoughts gentlemen, please correct me if my thinking is wrong..................
 

Fly Dawg

"Electricity is really just organized lightning"
Premium Pilot
Joined
Apr 29, 2016
Messages
4,659
Reaction score
2,077
Location
Watkinsville, Georgia
At 43.6sec the right back also started to get very erratic, presumably trying to compensate for the LF behaviour???
That was after the spin began. You can stop beating the dead horse now. There is really no way to know for sure which is the actual cause. The effects are obvious.
 

sar104

Dic mihi solum facta, domina.
Premium Pilot
Joined
Mar 22, 2014
Messages
5,305
Reaction score
2,700
Location
Los Alamos, NM.
Ahh, thanks for that. I've always understood that ESC's operate utilising PWM (Pulse Width Modulation), when I was in electronics in the Navy they certainly did. not PPM which until now, as you realise, I'd not heard of!

Having now read about the two a bit more light has gleamed!

View attachment 115543

So with that gem of information and plotting the PPM signals to the motors, at the time of the in vitiation of the "falling" out of the sky at about 42secs, the front left pulses suddenly went to 100, maximin, and stayed there until ground contact. To me this would lean towards the ESC rather than the motor.
At 43.6sec the right back also started to get very erratic, presumably trying to compensate for the LF behaviour???

View attachment 115544

Your thoughts gentlemen, please correct me if my thinking is wrong..................

If the ESC increased PWM for more motor speed and the motor did not respond, then doesn't that suggest a motor problem, rather than an ESC problem? Unless the ESC was misreporting, of course.
 

New Threads

Forum statistics

Threads
140,519
Messages
1,448,482
Members
102,310
Latest member
muiskraal