Failsafes

[Nick X-Cell Pro 2k]

http://www.revolutionmodels.co.uk/ac..._Co_Pilot.html

this is what I think nick is thinking about..
As I said before never seen one used before, maybe some of the more experienced have used or seen these.

all the advice about failsafes is correct though which is inbuilt into a pcm receiver. pretty much just ensures you hit the ground with the engine at idle. These co pilots reckon they can help stabilise and help a newby

Okay heres one for you all, if the receiver sets the engine to idle when the signal is lost or the sticks are released, why in some of the crash videos does the engine rev up and spin the bladed instead of cutting the throttle?

[robgt]

Some possibilities...

Model was not crashed through loss of signal so did not enter failsafe - idleup would keep the engine revving unless throttle hold was switched on by the pilot.
Failsafe not set.
Throttle linkage broken in crash so the carb can open up.
etc...

There's lots of possibilities.

Cheers,
Rob

[phil485]

or like me they use cheap ppm receivers without failsafe set up..

Must invest in a decent RX

[ajenkins]

Okay heres one for you all, if the receiver sets the engine to idle when the signal is lost or the sticks are released, why in some of the crash videos does the engine rev up and spin the bladed instead of cutting the throttle?

Emphasis added by me. I think I see part of the confusion, as you seem to be under the impression that the failsafe kicks in if the sticks are released. The failsafe only kicks in if the receiver stops receiving a signal from the transmitter, which probably won't happen just because you crashed.

As far a the CoPilot, I have read several reviews of that product and similar products. Under the right conditions they can return the helicopter to a hover if you just release the sticks, making conventional helis behave somewhat like coaxials in that regard. They can also be used as a failsafe by programming the receiver to enable the copilot if the transmitter signal is lost, so that the heli will just go into a hover if the signal is lost. Not sure how good an idea that is -- but it's possible that if the signal loss is transitory, then having the heli go into a hover until the interference or whatever goes away might be preferable to the heli just going to idle and crashing.

[Nick X-Cell Pro 2k]

[QUOTE=ajenkins;32048]Emphasis added by me. I think I see part of the confusion, as you seem to be under the impression that the failsafe kicks in if the sticks are released. The failsafe only kicks in if the receiver stops receiving a signal from the transmitter, which probably won't happen just because you crashed.

Okay I did know it only kicks in if the signal is lost but I could not understand why the ones crashing were not going to idle when the sticks are released, instead they were revving up.

[3dbasher]

the failsafe is part of a pcm reciever(internally) which moves the servos to a preset postion that you program via the tx, if the mechanical connection between the servo and the function its controling breaks or the servo fails/loses power then its usless anyway... sh$t happens i'm afraid

[Ade_Law]

if the model hits the ground due to pilot error this can cause the battery to become unplugged or xtal to fall out.

this will mean the throttle will stay where it was when control was lost. no failsafe is going to help that

[Nick X-Cell Pro 2k]

if the model hits the ground due to pilot error this can cause the battery to become unplugged or xtal to fall out.

this will mean the throttle will stay where it was when control was lost. no failsafe is going to help that

Good point, okay guys thats great fully understood now, thanks for all the replies.