On 13 Jul 2002, at 23:31, David Weinshenker wrote:
>
> Feature request noted... it's going to add _significant_ complexity, since
> the status indicators will need to be remoted as well, and we will need an
> on-board electronic latching circuit controlling the arming relay, for
> reliability.
>
> (Direct relay latching, where the relay coil is kept energized by current
> flowing through a contact on the relay, has the possible failure mode that
> if the contacts open momentarily due to vibration, the relay will lose coil
> power and drop out to the "off" state, resulting in the recovery system
> disarming itself in flight.... not good.)
>
Haven't you looked at solid-state relays? I would think they're a
natural for this application. Light in weight, and no vibration failures to
worry about (except possibly in external wiring.)
> Sounds like the system is going to grow a rather thick cable bundle
> between the electrical umbical and the blockhouse systems, once we
> implement that sort of feature... especially if we sequence it before
> the "Spike" telemetry system. (Once we have a general purpose digital
> data stream coming back from the rocket, it will be possible to include a
> "recovery system status byte" along with the A/D data.)
>
Chris
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