Gasser Zenoah Kill Engine device

[miami6]

I am a newbie to gasser engines i would like to have a way to kill my engine via channel 8 or 9 from my receiver

is there a device that can connect to the black kill wire similar to the opto swithes for camera trigger but that will ground the wire when i want to for emergency or for safety

I am using th x9303 2.4


does anyone use somthing like this or should i just give up and use the analog trim or a program mix assigned to a switch to close the butterfly of the carb to kill the motor

[cbergen]

Most of us setup the throttle linkage so that dropping the throttle trim all the way down closes the carb, killing the engine.

In an emergency, close the choke to kill the engine if you are in arms reach, or place your hand over the venturi if using one of those in place of the air filter.

[brw0513]

I purchased one of these for the exact purpose you mention

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

It is a switch, operated via the Tx, to ground the ignition. My Spectra G build is not finished yet, so I don't have any field experience, but advice received from Dimension Engineering was that this is the perfet apllication for the switch.

[cbergen]

As long as you have radio control, just move your throttle trim all the way down to kill the engine.

If you DON'T have radio control, then the battle switch won't do you any good either!!

[brw0513]

Very true Chris. I agree closing the carb butterfly completely is the way to go to shut the engine down.

No first hand experience, but I have read of various stories on the forums about "wearing out" throttle servos. Something about vibration. Don't know how true it is. From my earlier research, the jury seems to be out on whether to leave the carb closing spring in place or remove it. If it is removed, what happens if a ball link or servo arm popped off?

Closer to home I have heard of a throttle servo, on a Spectra G, that had failed in a way that left the throttle wide open (carb closing spring removed presumably). Luckily the heli was on the ground at the time. Some negative pitch and a broom handle to block the exhaust was the solution to stop the engine. Would have been nice to flip a switch ground the ignition.

I do wonder how relaible the Battle Switch would be though. And, is the extra complexity worth it for the unlikely event of a servo failure.

[cbergen]

We always leave the spring on, as you say, if you lose the servo, it'll close the throttle.

The spring also keeps a /slight/ tension on the butterfly, preventing the butterfly shaft from bouncing up and down, increasing the wear on the butterfly itself.

If you use a decent servo (vs some el cheapo), then the strength should be enough to overcome any spring resistance, and the servo should last, especially if used in a G10 frame!! :)

[brw0513]

Yep. Convinced me to leave the spring on!

[Joey.S]

Hi guys,

When you say spring do you mean the oem spring on the carb or is there an extra spring your adding?:confused:

Joe

[cbergen]

The OEM spring already mounted on the carb when you buy it.

[Joey.S]

The OEM spring already mounted on the carb when you buy it.

I know about the one mounted on the carb I just heard of people adding another return spring from the carb to the heli frame.

Joe

[cbergen]

Hmmm, hadn't seen that one!