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HelicopterGasser Model RC HelicoptersOther › Brainstorming - The best kill switch
03-22-2009 05:32 PM  8 years agoPost 1
ranger-7

rrNovice

Nürnberg / Germany

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Hi I need a kill switch, i had a bad experience at weekend. A battery wire cut itself at then the heli had no reaction. had to stop the engine with a long stick in order to stop engine by turn over the carburator gas arm while the rotor was working. Thats not the feeling you wish to be faced with...

So what will be the best solucion ___

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03-22-2009 05:46 PM  8 years agoPost 2
nitro fun

rrApprentice

Oc ca

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use a return spring for the carb, and use a digital servo that is easy to move when the power is off, so the spring will close the carb to idle when there is no power.

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03-22-2009 06:18 PM  8 years agoPost 3
TaleGunner

rrElite Veteran

Deer Park WA

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A few of us have been working with Kent at http://www.rckillswitch.com/ to solve this problem, they are now available Kent's user name is Pb2theMax and I'm told he is a new RR vendor

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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03-22-2009 07:17 PM  8 years agoPost 4
copperclad

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NY

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hi
i use a pico switch on all my gassers

http://www.dimensionengineering.com/PicoSwitch.htm

it will work for electronic ignition or magneto ( with a slight mod ) and will let you kill the engine either with a switch on the TX or if RX power is interrupted such as lose of power the engine will shut down , i do not feel comfortable flying a gasser without a remote kill

this has been an ongoing argument , between the kill switch is dumb crowd , and the not having a kill switch is dumb crowd , so i am sure you will hear both sides

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03-22-2009 07:26 PM  8 years agoPost 5
TaleGunner

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Deer Park WA

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After almost loosing my leg & ankle to a run away I wont fly without one! when it lost receiver power throttle jumped and heli ate me. If it would have sensed power loss and died, I wouldn't still be nursing a wound. so I think we all should have a remote kill switch. and better yet an automatic kill on loss of power or receiver signal! they can be programed both ways.

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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03-22-2009 08:46 PM  8 years agoPost 6
ranger-7

rrNovice

Nürnberg / Germany

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So i effort my brain too a bit and that is what it came out :


all items you need are 2 relays and a conductor board and a few wires.

And so should it work you need 1 rx ch....
If the relay 1 is closed by a switch at your RX then it also closed the relay 2, the result the ignition will be supplied with energy.

So what happens if you put switch on the tx off ?
Relay 1 open , Relay 2 open, Ignition killed

And when a wire cut itselfs, like it catched me?
no energy at relay 2, result ignition killed

It would also possible to built in 2 leds which show you the status ...
So let me know if i forgotten something

Due to the voltage regulator thats no danger of fluctuating voltage at the relays so they work at every battery level equal

if you got a spektrum receiver youre able to program the switch to kill the ignition if signal lost

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03-22-2009 10:13 PM  8 years agoPost 7
copperclad

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NY

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hi Ranger7
i think you will find out it is not that easy if you want to control the relay with an RX channel

what you will find is the RX channels are a square wave , where they go high once every 20 milliseconds for 1~2 millisecond , this will not pull in the relay

you have two options

you can set up a very simple power off kill with a single relay , by having the relay powered off RX power , so if the RX loses power the relay will power down and open or close ( depending on the relay you use

the second way , is to have the circuit controlled by an RX channel , so a TX switch can open or close the relay , this way you have a remote kill switch , and on lose of RX power it can also kill the engine

the second way is more involved than a simple relay , and you need a circuit that can sense the position of a RX channel and control power to the relay , this would be something like the pico switch or the rckillswitch that talegunner mentioned

you can do a google search on RC controlled switch to find DIY circuits that will control a relay here is a link to one example

http://www.ef-uk.net/data/rc-switch.htm

in this example the load would be your relay

HTH , cheers

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03-22-2009 10:35 PM  8 years agoPost 8
ranger-7

rrNovice

Nürnberg / Germany

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thanks copperclad,
well i will find out tomorrow we have here a good electronics retailer will ask him what he can offer ... the fact with squared wave i dindnt mentioned... thanks for the link i love tinker , i will do it...

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03-22-2009 10:41 PM  8 years agoPost 9
ranger-7

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Nürnberg / Germany

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copperclad once more,
for what is the second battery connection just bit left from the "load"?

could you tell me pls.

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03-22-2009 10:59 PM  8 years agoPost 10
copperclad

rrElite Veteran

NY

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hi ranger-7

in the diagram , the second battery connection is power for the load , if the load were 5 volts , this could be supplied right off the RX , but you could also have say a 12 volt battery , for a 12 volt load

there are many , many , circuits to do this type of thing , and some are simpler and some are more complicated

i am familiar with the pico switch , that just uses a very small pic controller ( micro controller ) to read the signal and control the relay

i am a tinkerer too , and by all means , get some parts and play around with your ideas , it is a whole other area of the hobby , and just as much fun , cheers

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03-22-2009 11:08 PM  8 years agoPost 11
ranger-7

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Nürnberg / Germany

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thanks thats what im thinking about too, sometimes i seems that im happierer if i can tinker that to fly...

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03-27-2009 12:47 AM  8 years agoPost 12
Justin Stuart (RIP)

rrMaster

Plano, Texas

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So then what is the consensus as to the best arrangement for a kill switch? Something operated by the radio, or something mounted on the heli? Or both?

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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03-27-2009 01:03 AM  8 years agoPost 13
TaleGunner

rrElite Veteran

Deer Park WA

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So then what is the consensus as to the best arrangement for a kill switch? Something operated by the radio, or something mounted on the heli? Or both?
If you don't want to build one get the PB Kill Switch I have been using the new unit for over a week now its both a manual kill switch and an automatic kill when loss of signal or voltage.

I don't think I will fly my Gasser without one anymore.

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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03-27-2009 01:16 AM  8 years agoPost 14
copperclad

rrElite Veteran

NY

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So then what is the consensus as to the best arrangement for a kill switch? Something operated by the radio, or something mounted on the heli? Or both?
i like the remote kill , you need an extra channel on your RX but i think it is worth it

the other feature with these , that i think is important , it can be setup so that with lose of power , the ignition is cut

it has been pointed out in other threads that a remote kill is not needed since you can kill the engine with the throttle , but i have had the unpleasant experience of a throttle servo going bad , and the remote kill not only saved the day , but made a convert out of me also

of coarse it all boils down to preference , if you think it is a good idea , and want to use it , the information is out there , and there are a number of commercial units available HTH

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03-27-2009 02:56 AM  8 years agoPost 15
TaleGunner

rrElite Veteran

Deer Park WA

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Yes I like the remote kill as well much easier and safer than choke or manual kill switch

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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03-27-2009 02:49 PM  8 years agoPost 16
ranger-7

rrNovice

Nürnberg / Germany

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I ordered a battle switch from dimension engineering, well is has the same functions as mentioned, i also tried to build one on my own regarding the plans i was told here but, i think it would be better to get one which is built by smd-tecnology the circuit paths dont really look reliable if i soldered it but it also could depend on my soldering skills

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03-27-2009 11:18 PM  8 years agoPost 17
pgkevet

rrKey Veteran

Wales

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I was looking for other stuff and came across http://www.hobbycity.com/hobbycity/...trolled_Switch_

I wonder if that on a tx that can set any spare channel failsafe in the rx might be a cheap option...? At least could work preddie's lights on the cheap

pgk

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03-28-2009 12:25 AM  8 years agoPost 18
Wayne Parrish

rrVeteran

Apex,NC,USA

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The following link is for the best kill switch system I have seen. I use it on my giant scale gas a/c and am going to install one on my VArio Bell 47 G3, Great product !!http://electrodynam.com/rc/EDR-107/index.shtml

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03-28-2009 01:26 AM  8 years agoPost 19
Pb2theMax

rrNovice

Middletown, OH USA

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Make sure that the kill switch you choose has a Normally Closed relay. Many kill switches do not. Mine do.
If you crash, and a connection comes loose then a Normally Closed kill switch will kill your engine, even without any battery power. If you have a Normally Open kill switch then there is no way to remotely shut down your engine if you loose battery power.

Another thing to consider is the resolution of your radio. Some kill switches cannot "comprehend" the signal on some of the newer 2.4ghz radios. In layman's terms, the signal is too fast and the kill switch thinks that a radio signal is not present, and it will not allow the engine to start. To remedy this my kill switches are loaded with specially designed firmware that can read these new super fast signals.

This link gives more details on how my kill switches work. http://www.rckillswitch.com/faq/faq.php

Thanks,
Kent

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03-28-2009 09:40 AM  8 years agoPost 20
Dimitris76

rrApprentice

Carmel, IN

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You can make your own kill switch for $0 if you have an old servo and a small SPST relay in your junk box!

I have pposted this info in this forum a few months ago. Here is the diagram:

Use a normal closed relay and an electrolytic capacitor in parallel to the coil if you wany it to kill the engine at RC power loss. Or just use a double throw relay for more options.

Dimitris

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