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HomeAircraftHelicopterGasser Model RC HelicoptersOther › DIY killswitch revisited
06-07-2009 08:06 AM  9 years agoPost 1
pgkevet

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Wales

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...For those that recall I made up such a switch using a cheap turnigy remote switch and a relay.

..Now the rebuild is almost done and I've been testing out the electronics I'm seeing power hits when this is activated. It probably wouldn't happen with the jewel running or a higher capacity NIHM but the horror thought of a hitting the killswitch with problems in the air and having a brownout at the same time don't bear thinking about.

It would probably also be OK to scrap the relay and use the turnigy switch directly.. but that requires either a loop-back from an engine ground line or a separate battery. And neither is a good solution. My electronics ability isn't up to working out what size capacitor to smooth this out and it'd make the thing bulky anyway.

SO.. it was worth playing with but not worth using. The switch will now be used to control some lighting instead and I'm only out of pocket £1.50 and some time.

I'll order the zkill I've got on Preddie.

All sorts of reasons why Spectra rebuild has been so slow. If I get around to it I'll post some pics of the wiring solution. It's been tight getting the bundle of stuff in there without Y-leads and everything sheathed.

pgk

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06-07-2009 12:50 PM  9 years agoPost 2
Justin Stuart (RIP)

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using a cheap turnigy remote switch and a relay.
I use a lot of Turnigy stuff on my foamie airplanes, but I wouldn't trust anything from HobbyCity on an aircraft which is not disposable (except maybe for their lipos).
I'll order the zkill I've got on Preddie.
42% makes good stuff, and they have a lifetime warranty.

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06-07-2009 03:14 PM  9 years agoPost 3
pgkevet

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Wales

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I use a lot of Turnigy stuff on my foamie airplanes, but I wouldn't trust anything from HobbyCity on an aircraft which is not disposable
There's nothing wrong with the remote switch.. it's the relay that's responsible for the current hits..but agree that one is careful about what used where.

The more I have the killswitches the happier I am .. also allows one to cut the engine cleanly for a plug reading.

pgk

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06-07-2009 03:25 PM  9 years agoPost 4
copperclad

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NY

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Hi
i have been running a pico switch for a while now , and wouldn't fly without it , as it comes it will work with electronic ignition ( N.O. ) but it is easy to reconfigure to normally closed ( N.C. ) for magneto engines ,here is the link

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

what i like about the relay kill systems , is if the machine loses power , the relay goes to its unpowered state and kills the ignition , cheers

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06-08-2009 01:28 AM  9 years agoPost 5
Pb2theMax

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Middletown, OH USA

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The modified Pico is cool, and Ive made hundreds of them, but the new Killer Bee is better suited for helis. Stronger relay, updated firmware to handle todays fastest radio frame rates, 2s lipo compatible. About a dozen are in use in gas helis around the world right now, with great results. http://www.KillerRC.com PM me if you'd like to test one.

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06-08-2009 01:44 AM  9 years agoPost 6
copperclad

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NY

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Hi Kent
i have been reading about your kill switch since i saw a post on it a few months ago , and it sounds very good , it for sure is an improvment on the pico switch , it is obvious you have designed it from the ground up as a kill switch and to have the features needed , where as the pico is more of just an RC switch , that can be pressed into service as a kill switch also , keep up the good work , cheers

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06-08-2009 02:14 AM  9 years agoPost 7
Justin Stuart (RIP)

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How does your new switch differ from your old PB2theMax modified Dimension Engineering Pico Switch?

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06-08-2009 02:44 AM  9 years agoPost 8
Pb2theMax

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06-08-2009 06:09 AM  9 years agoPost 9
pgkevet

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Wales

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Is there any delay/override built into your switch?

In other words I can set any channel to failsafe including my killswitch but am reluctant to have it that way and have the engine cut in a temporary glitch. I'd rather have the throttle glitch to idle and killswitch manually on my decision than glitch to engine cut.

A visible glitchlight would be cool but where you'ld put that on a heli to see it in every orientation baffles me. (yeah, can use other systems to report it later)

pgk

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06-08-2009 06:19 AM  9 years agoPost 10
Pb2theMax

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Yes, just set your radio's built-in failsafe on that "aux kill switch channel" to turn On during loss of radio reception. This will override the auto-kill feature and allow the engine to keep running.

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06-08-2009 06:13 PM  9 years agoPost 11
pgkevet

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Wales

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Yes, just set your radio's built-in failsafe on that "aux kill switch channel" to turn On during loss of radio reception. This will override the auto-kill feature and allow the engine to keep running.
..a convenient use of a double negative!

pgk

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06-08-2009 09:13 PM  9 years agoPost 12
TaleGunner

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Deer Park WA

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I have been using one of the rckill switches for some time now and wouldn't consider flying without one. I'm convinced its a must have feature I never use my carb to kill my engine anymore just flip the switch from the transmitter.

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

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06-08-2009 10:21 PM  9 years agoPost 13
pgkevet

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Wales

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.totally agree on having a killswitch.. once it was installed on predator I also use it all the time to cut the engine..also figure it should give a better plug reading than idling off..?

..best compromise for helis might be one that is radio operatted but if signal is lost for a significant period..say 20 seconds (long enough for a glitch to clear and any rx to re-establish) then killed airside even if rx power lost. But that would present difficulties in design? capacitor decay?

pgk

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06-08-2009 10:34 PM  9 years agoPost 14
TaleGunner

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Deer Park WA

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20 sec delay is forever with no control I have my kill switch set to kill the motor with fail-safe. I assume if I get control back from a glitch or power reset I can auto in. I have never had a receiver failure were I got control back in time to save a heli if at all so I have opted to kill the engine but the choice is yours on setup.

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

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06-08-2009 11:15 PM  9 years agoPost 15
Pinecone

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Maryalnd

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How are people doing it with Spektrum? You can set explicit fail safe position for the higher level Rxes, but then you have to set EVERY channel to explicit failsafe.

Terry
Blade CP Trex 450 SE
QJ EP8v2 EX Gaui Hurricane 550
Vibe 50 Bergen Intrepid Gasser

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06-08-2009 11:33 PM  9 years agoPost 16
pgkevet

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Wales

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20 sec delay is forever with no control I have my kill switch set to kill the motor with fail-safe
The killswitch should be the ultimate backup. You can set throttle to failsafe for a simple glitch and if you have control but a jammed open throttle then you can manually activate the killswitch and do your auto.

My thoughts behind the suggested 20 secs was for the outrageous situations: heli chugging off into the distance somehow, you started it and flightpack fails on the ground that sort of thing. And you don't want it cutting the engine on a 2-3 second glitch, unusual attitude that blocks signal etc. One of your 2.4G aerials broke off unnoticed and it range checked fine but loses signal over the loop...

pgk

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06-08-2009 11:46 PM  9 years agoPost 17
Justin Stuart (RIP)

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Plano, Texas

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You could get a V-bar, and then if you lose radio contact (and the heli is trimmed correctly) it will just hover right side up or upside down just waiting for a reconnection.

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06-09-2009 12:06 AM  9 years agoPost 18
TaleGunner

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Deer Park WA

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You could get a V-bar, and then if you lose radio contact (and the heli is trimmed correctly) it will just hover right side up or upside down just waiting for a reconnection

I would pay to see that one I cant get mine to hover in one place when I have comeplete control

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

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06-09-2009 12:20 AM  9 years agoPost 19
pgkevet

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Wales

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I cant get mine to hover in one place when I have comeplete control
Ah! But you do get extra style points for your artistic interpretation of a hover

pgk

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06-09-2009 01:47 AM  9 years agoPost 20
Justin Stuart (RIP)

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Plano, Texas

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I cant get mine to hover in one place when I have comeplete control
Does your helicopter fly better when you let go of the transmitter? If so, then you might have a case of the "dumb thumbs". I've been afflicted by this condition for many years, and there seems to be no cure.

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