hdwysong(at)gmail.com
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 Posted: Tue Jan 31, 2006 12:47 pm Post subject: the physics behind Rotax ignition switch ratings |
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The Rotax 914 manual calls for using ignition "kill" switches rated for
a minimum switching voltage of 250 V and a minimum switching current of
0.5 A. I've convinced myself that the Carling switches we have (from
B&C) are suitable after reading Bob's "Switch Rating" article. However,
I'm curious about the physics...
Is there really 250 V built up in that dual CDI just waiting for a path
to ground?
I assume that there is resistance in series to limit the current to 0.5
A when the ignition system is shorted. Would more resistance in series
with the "kill" switch act to increase the time constant of the shorted
ignition circuit (assuming it looks like an RC circuit) thus leading to
a longer "bleed" of energy from the CDI capacitors... and perhaps a
delayed shutdown?
Can anyone describe a "typical" time history of voltage and current
across the switch contacts for a "kill" event?
Thanks for entertaining such random thoughts!
D
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