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Old 04-19-2009, 11:58 AM
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Bob Pastorello
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Default RE: Newbie to Gas General Information

36. KILL SYSTEMS - Gassers, because of their power (and usually size of airplane) **SHOULD** have some sort of a "kill device" either mechanical, or electrical. In general, most folks agree that a transmitter-operated kill switch is a good safety device. If airborne, with a typical large tank, your throttle servo fails or disconnects, you either land hot and break something, or fly around risking killing batteries. If you have a switch to flip that chokes the engine, or removes power from the ignition, YOU can decide when to land - safely.

a. Choke Servo - this involves hooking up a choke servo to an extra channel, and assigning to a switch or lever on the TX that closes the choke when you actuate it. Overly-rich, with air cutoff, the engine will die quickly. Pros and cons to this system.

b. Electronic Kill Device - this involves an electronic switch that is operated by a spare RX channel, activated by the TX that cuts off power to the ignition module. These are nearly always installed "after" the on-board separate ignition switch, and "before" the module in the power lead. Usually optically-coupled electronic switches, they don't induce any harmful interference when properly installed. Lots of these available. If going this way, ask around your area, or on RCU to help make your decision.

Whatever you do, please ALWAYS consider the safety benefit of being able to shut off your gasser when YOU want to. It is a vital element of overall RC safety, IMO.
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