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Old 02-17-2002 | 03:05 PM
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rc4me2
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From: Ypsilanti, MI
Default Re: Kill Switch

Originally posted by Big_Bird
FastDoc98, I'm not familiar with the Tower kill switch. However, here is a proven and inexpensive way to hook up a servo operated kill switch to an engine with a battery powered ignition system.

Ken
Thanks Ken! And everyone else as well. I am new to gas and did not know of these remote-kill requirements. I am installing an MVVS 1.6 in an H9 CAP. I am using the stock throttle arm including the idle stop. So I could not kill the engine via throttle (idle down). The engine has no choke, so I can't use that.

Fortunately, I found this thread and implemented the micro-switch/nyrod method. It works great.

I put my own little spin on the scheme. I have a Futaba 8UAPS TX with a momentary switch. I use this switch for activating the throttle-cut feature on the 8UAPS on my glow planes (just adds x% to minimum throttle to close carb).

For my gasser installation, I used a programmable mix from the throttle to channel 7. The mix is activated by the same momentary switch on the TX. The kill servo is connected to ch 7 and the mix is the negative of the lower half of the throttle movement. So at idle the kill servo has maximum mix (and thus kill-servo travel) to activate the micro-switch. At 25% throttle and above it does not have sufficient travel to kill. So you don't have to worry about an accidental activation in the typical flight power settings.

So it acts just like the stock Throttle Cut feature of the Futaba 8UAPS using the same switch. This is cool, because I already have the "reflex" of hitting the throttle cut momentary switch on the TX from all of my other (glow) airplanes.

Thanks for all the help!

jc