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Home✈️Aircraft🚁Helicoptere-AlignOther › Opinions on PCM failsafe mode
11-10-2005 01:28 PM  14 years ago
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Daniel Wee

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Singapore

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Opinions on PCM failsafe mode
Just wondering how many of you use the failsafe mode in PCM. I had a crash today when the receiver went into PCM failsafe while I was in a bank and got thinking if I had left the failsafe mode off it would have been better. From what I have tested, if you have the failsafe mode off, the receiver will hold the last known good command. In any case, my feeling now is that the failsafe mode isn't that safe afterall. I plan on not using it from here on.

Daniel
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11-10-2005 01:34 PM  14 years ago
nivlek

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Norfolk England

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The failsafe isn't intended to save the model , it's intended to prevent the model from causing damage or injury to property or persons . It sounds like yours did just that .At the end of the day , it gets dark .
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11-10-2005 02:33 PM  14 years ago
Ben-T-Spindle

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Central Illinois

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The only fail safe function I use is to turn the motor off. Most of the time the lockout is caused by electrical noise – with the motor off you have some chance that you can regain control before it hits the ground.

If you use the governor mode don’t set the fail safe to 0 throttle as that will cause the ESC to re-initialize the spool up sequence. Set it to something like 5 or 10% so you will get full power when the lockout clears.

After a problem like yours you should make some test flights with a PPM (non PCM) receiver to get all the glitches worked out before you go back to PCM. PCM does not get rid of the glitches it just masks them and will go into lockout if the glitches are bad enough.

.
... BTS
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11-10-2005 03:08 PM  14 years ago
Helifool

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Rochester New York

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I agree with Ben-T-Spindle and do the same thing. Just think about this, you say from experience that the without Failsafe your reciever will hold the last command. What if your last command were full collective? Who knows what could happen.
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11-10-2005 06:18 PM  14 years ago
steph280

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Irvine, California

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Agree with above statements.

Failsafe is not going to save your heli. You want the heli to power down and crash instead of flying full speed into a crowd of people.
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11-10-2005 06:23 PM  14 years ago
Hellijunky

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Chicago

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What if your last command were full collective?
see ya....
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11-10-2005 10:56 PM  14 years ago
steph

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Hampshire England

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On the pcm 10 transmitters you have the option of selecting the channels you want to fail safe or hold last known position
I have the throttle set to shut down and everything else set to last known good position at the end of the day safety is foremost in my book
With pcm i think the best thing is that it will reject the bad interferance and hold the last known good position normaly the interferance is very short so you don't even know you have been hit its only if it persists that you will have a failsafe unlike ppm is you get interferance you will see it and most of the time the heli will crash or do something silly like the chicken dance
But as it has been pointed out if your heli is causeing the interferance in the first place you will get lockouts
The world is round you can run but you will always end up where you started from
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11-11-2005 12:11 AM  14 years ago
Ben-T-Spindle

rrProfessor

Central Illinois

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You should set the rudder to go to neutral and the gyro gain to go to heading hold. That way the gyro will stop the helicopter from spinning.

.
... BTS
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11-11-2005 04:32 AM  14 years ago
turboomni

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East of the Equator

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Is it fair to say that PCM is no better than non Pcm except for the failsafes?
I thought the whole PCM deal was better than non PCM in every way.
Are the Failsafe's the ONLY reason for PCM?
I have heard Pcm's "mask " problems
What's the deal?
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11-11-2005 05:31 AM  14 years ago
Coolpowered

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Youngstown, ohio

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Been running pcm rec's in my helis for years now with out a lockup, and with out a glitch! Dont wont a glitch when inverted a inch off the ground. that is the reason I run them on mine. on my nitro machines i run the fail safe to go to idle and full collective to burn off all head speed in case I do have a lockout so it will fall out all the sky with no killer blades running at 2000 rpms, but this is just my opinon.YRCHA CLUB MEMBER
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11-11-2005 06:24 AM  14 years ago
Daniel Wee

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Singapore

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Actually the lockout occured at a spot where it's been known to be bad. A number of people have crashed there and I've even seen the PCM glitch in that spot for some odd reason. PPM machines always glitch in that vicinity. I need to survey the place with a scanner to see what's going on there. I don't mind crashing due to my own mistakes but this is not fun at all.

Daniel
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