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HelicopterMain Discussion › remote kill a gas engine
11-30-2007 01:22 AM  10 years agoPost 1
legoman67

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Nanoose Bay B.C, Canada

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how would i rig this? its not a rc engine that kills at dead throttle... i would have to make some way to cut power to the spark plug, but how would i remotely, with a servo?

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11-30-2007 01:28 AM  10 years agoPost 2
Mutt

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M ca usa

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great planes has a switch kit you just set it up to work with a mini servo I have just taken a switch from radio shack and hooked it up to a mini servo and splice it into the like going to the mag. I do that with all my gas planes.

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11-30-2007 01:29 AM  10 years agoPost 3
jschenck

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La Vista, NE.

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operate a switch that will ground out the ignition system.

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11-30-2007 01:31 AM  10 years agoPost 4
legoman67

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Nanoose Bay B.C, Canada

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so just get a nice long knob on a switch that a could screw a ball link into... ill have to try that, anyone know what the switch should be rated for(amp wise)?

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11-30-2007 01:35 AM  10 years agoPost 5
jschenck

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La Vista, NE.

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no amps to speak of - any typical switch should work since the mag can't build a charge once it's ground (as I understand things)

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11-30-2007 02:46 AM  10 years agoPost 6
psawya

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Woodinville, WA

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take out the idle stop screw so you can close the butterfly in the carb all the way. It'll stop the engine same way we do the glow birds.

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11-30-2007 02:52 AM  10 years agoPost 7
FloridaHeli

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jacksonville, florida

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I used to have a kill switch in the form of a small limit switch on my R/C boats. It was set up on the throttle when you pushed the throttle trigger back for reverse. It moved the servo arm over the normally open limit switch and shorted the ignition to ground. Works the same way as the shutoff switch on a weed eater.

My R/C heli I do what "psawya" suggests above; remove the idle stop and allow the throttle servo to completely close the throttle when the throttle/pitch stick is all the way down and the trim is also all the way down. Works great on my Predator Gasser. Never had it keep running when I did this.

Good luck and have fun.

This hobby is WAY too expensive!!

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11-30-2007 03:04 AM  10 years agoPost 8
legoman67

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Nanoose Bay B.C, Canada

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hmm psawya's sounds the easiest. i dont yet have the engine, but when i do get it i will try that.im figuring things out ahead of time

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11-30-2007 04:03 AM  10 years agoPost 9
helo_chris

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goodlettsville, tn

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Do what psawya said and then use one of these, they can be wired to work with ei or magneto. They are also a great failsafe measure also because if the Rx loses power it will kill power to the ignition also.

http://rcatsystems.com/electronics/rc100.php

"There is a fine line between cutting edge and bleeding edge.."

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11-30-2007 04:39 AM  10 years agoPost 10
oldboldpilot

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Southern California

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For safety, you need two ways to cause an ignition engine to quit: (1) the usual closing of the butterfly valve by throttle servo; (2) the interruption of the ignition function.

The ignition interrupt function is desired on the ground and in the air.

You put an on-off switch between the ignition battery and the ignition module to provide the "on-the-ground" kill function.

To interrupt the ignition function in the air, you rig a two-position switch between the ignition battery and the ignition module. This switch is then linked to a servo which is set up like a retract servo - it's either "open," or "closed."

So you have two methods to kill the engine: on the ground, the ignition on/off switch; on the ground or in the air, the servo-controlled on/off switch.

Thus, to start the engine, you need to manually flip the ignition switch to "on," and on your Tx, switch the ignition switch to "on."

If you need to kill the engine on the ground, you can either flip the physical ignition switch "off," or the Tx ignition switch "off," or slide the throttle trim (or Futaba throttle kill) to "off."

In practice, switching the on/off switch to off is worrisome, because of the spinning rotor blades, ha, ha, haaa..

So you will use the servo via Tx. But please incorporate the mechanical switch anyway, to provide for a safe "on" condition? Takes two "on's" to make a real "on."

Helis are Man's Defiance of the Laws of Nature - OCHC

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11-30-2007 04:45 AM  10 years agoPost 11
killerg

rrApprentice

Eastvale, California

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Are you using electronic ignition? If so use a Smart fly optical kill switch. You wont need a servo to make it work. Here is the link.
http://www.smart-fly.com/Products/Ignition/ignition.htm

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11-30-2007 07:08 AM  10 years agoPost 12
SuperSixTwo

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Virginia City, NV ---USA

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I bought the kill switch that Zenoah sells from Horizon. Cheap yes, and works fine.

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11-30-2007 12:23 PM  10 years agoPost 13
copperclad

rrElite Veteran

NY

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hi
i have been using a pico switch for a remote kill on my gasser , inexpensive and easy , HTH , dana
http://www.dimensionengineering.com/PicoSwitch.htm

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