- Jan 23, 2009
- Reaction score
I can understand having redundant charges for each stage of deployment, but would it really be a good idea to have, say, both apogee charges running off the same altimeter? That would make the altimeter itself a single point of failure. That's one of the advantages of having dual altimeters, where if one goes stooopid on you, the other one will probably still function.
Connections (power and ematch) are by far the root of most electrical system failures of which altimeter failures belong.
I would venture next down the list would be inadequate ignition devices (homemade ematches, non-pyrogen devices, damaged ematches). Commercial ematch failures are exceedingly rare when applied correctly.
Redundant power and redundant deployment channels with a single altimeter most likely will have 90% (99%?) of the reliability of properly implemented totally redundant system. The trouble is that simply hooking up two altimeters in parallel is not necessarily a proper implementation of such.