Comment by ARHEXA on March 28, 2011 at 5:24am

exactly,

this video is exactly the opposite of any common sense design...

 

now to some experienced user question -

If i disconnect the power of the APM/IMU/TX all together off the BEC, in the middle of a flight while motors running,

but the ESC's are still connected to the battery - what will happen ?

(in other words what happen when you unplug an ESC signal cable while running)

 

hopefully this will stop the motors, that way i can put a relay to disconnect the 5v electronics, rather than having to use a very high amperage relay to disconnect ESC's off the LIPO....

Comment by ARHEXA on March 28, 2011 at 5:29am

Here i found a successful one, @ 0:40

http://www.youtube.com/watch?v=NbQryfscr-U

Comment by I.S. on March 28, 2011 at 5:29am

you could also send 0% throttle to the ESCs instead of disconecting them.

With no signal, and ESC not having any failsafe function, should stop

Comment by Martin Seven on March 28, 2011 at 5:33am

My mother's a seamstress so I had a bunch of 1-meter square chutes made from extremely fine cotton. 55 grams each. I haven't tested them yet, so I'm flying them with the pyro disconnected. Can't wait for the summer :-)

Comment by Martin Seven on March 28, 2011 at 5:36am

With Turnigy ESCs (and others) you can enable the "Break" option. What it does is it forcefully stops the motors if you command 0 RPM (lowest calibrated PWM value). They stop from hover speeds to zero in a second or so.

Comment by ARHEXA on March 28, 2011 at 5:36am

for sending 0% throttle i have to use the copter code, and at the moment of truth i rely on the electronics.

if the quad fails because of the electronics, i cant use the software to turn off the motors...

i must have an aggressive and simple way to switch to emergency state, like disconnecting the motors or the APM

Moderator Comment by Gary Mortimer on March 28, 2011 at 5:39am

Springs work as well

http://vimeo.com/8904576

Comment by Martin Seven on March 28, 2011 at 5:52am

You could ground the signal wire, but that will initiate the brake after a delay (about one second). A more involved option would use a simple rugged PWM generator that would output 50% duty cycle (zero throttle) that you would switch all signals to. This would stop the motors instantly.

Comment by ARHEXA on March 28, 2011 at 5:55am

I think of getting this one.

http://cgi.ebay.com/48-Red-Model-Rocket-Parachute-Quality-Rip-Stop-...

 

the description says 'slow descend' for 1.5kg and moderate speed descend with ~2kg...

my copter will be more than 2kg, so i think there's no chance i'll try some smaller than 48"....

on the same hand, i hope 48" will be enough...

Comment by ARHEXA on March 28, 2011 at 5:59am

@Martin-

right, but then i have to add 4 small relays (or 2 double pole) to switch the signal off the APM.

i've seen a warning somewhere to NEVER disconnect an ESC from the APM while running. (that could damage APM)

I really prefer the electronics disconnecting option...

i guess i will have to experiment what happens to the ESC in that case...

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