[altusmetrum] altusmetrum Digest, Vol 64, Issue 1

Rob Derstadt rderstadt at gmail.com
Fri Apr 15 10:52:37 MDT 2016


I agree with the horizontal "safe mode" technique. It's what I use now.

The current NAR requirement states:

"The capability must exist to externally disarm all pyrotechnic devices
on-board the rocket. In this context, ‘disarm’ means the ability to
physically break the connection between a pyrotechnic system and its power
source. ***Simply turning off the device controlling the pyrotechnic(s) may
not be sufficient.***"

   1.

So is this really just using the other pole on the rotary switch to control
the battery connection?



On Fri, Apr 15, 2016 at 10:37 AM, <altusmetrum-request at lists.gag.com> wrote:

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> Today's Topics:
>
>    1. Advice on wiring dual Telemetrums for arm/safe? (Rob Derstadt)
>    2. Re: Advice on wiring dual Telemetrums for arm/safe? (w9ya)
>    3. Re: Advice on wiring dual Telemetrums for arm/safe? (w9ya)
>    4. Re: Advice on wiring dual Telemetrums for arm/safe?
>       (Chris Attebery)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 15 Apr 2016 09:57:17 -0600
> From: Rob Derstadt <rderstadt at gmail.com>
> To: altusmetrum at lists.gag.com
> Subject: [altusmetrum] Advice on wiring dual Telemetrums for arm/safe?
> Message-ID:
>         <
> CACyCNxQ1cSrDAukeyi2oBJzegyEgspFa4MD7FiNt4peziOBbew at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hello,
>
> I'm trying to work out how to wire up the outputs of two Telemetrums (one
> primary, one backup) so that I can add an extra arm/disarm rotary switch
> between the outputs and the terminal blocks (the NAR L3 requirement to cut
> power completely from the pyro's).
>
> This is my initial wiring diagram:
>
>
> https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
>
> Normally I'd just *try* it and see what happens, but I don't want to fry
> two board if I get it wrong. I'm also concerned that in the "safe" position
> that the continuity indicator on each board would still indicate everything
> green, which could lead to a launch with the pyro's inhibited.
>
> Has anyone flown this configuration before? If so, any suggestions on how
> to hook it up?
>
> Thanks guys.
>
> -Rob
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> Message: 2
> Date: Fri, 15 Apr 2016 10:23:24 -0600
> From: w9ya <w9ya at qrparci.net>
> To: Altus Metrum <altusmetrum at lists.gag.com>
> Subject: Re: [altusmetrum] Advice on wiring dual Telemetrums for
>         arm/safe?
> Message-ID:
>         <CAASHNdXAcBka=
> e8+mvwy+EQ1kvVrLaxUHv4Jkmdzz6VhpNx2HA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Um, please check with your L3CC.....quite a few of them do NOT want you to
> fly with switches in series with your charges !!
>
> Best regards;
>
> Bob F.
>
> On Fri, Apr 15, 2016 at 9:57 AM, Rob Derstadt <rderstadt at gmail.com> wrote:
>
> > Hello,
> >
> > I'm trying to work out how to wire up the outputs of two Telemetrums (one
> > primary, one backup) so that I can add an extra arm/disarm rotary switch
> > between the outputs and the terminal blocks (the NAR L3 requirement to
> cut
> > power completely from the pyro's).
> >
> > This is my initial wiring diagram:
> >
> >
> >
> https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
> >
> > Normally I'd just *try* it and see what happens, but I don't want to fry
> > two board if I get it wrong. I'm also concerned that in the "safe"
> position
> > that the continuity indicator on each board would still indicate
> everything
> > green, which could lead to a launch with the pyro's inhibited.
> >
> > Has anyone flown this configuration before? If so, any suggestions on how
> > to hook it up?
> >
> > Thanks guys.
> >
> > -Rob
> >
> > _______________________________________________
> > altusmetrum mailing list
> > altusmetrum at lists.gag.com
> > http://lists.gag.com/mailman/listinfo/altusmetrum
> >
> >
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> ------------------------------
>
> Message: 3
> Date: Fri, 15 Apr 2016 10:33:25 -0600
> From: w9ya <w9ya at qrparci.net>
> To: Altus Metrum <altusmetrum at lists.gag.com>
> Subject: Re: [altusmetrum] Advice on wiring dual Telemetrums for
>         arm/safe?
> Message-ID:
>         <
> CAASHNdX4uphXHXGn+RJH1mKK81QOMsER7P6DiOYf3fwWuBsmag at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> P.S.... with the "flight mode" safeguards (turning on the unit while
> oriented horizontally protects you from incidental firing of charges, and
> then rebooting the TM after thee rocket has been placed on the pad and made
> ready for flight) makes the pyro activation switches essentially redundant
> !! (Virtually 100%, um; more or less....)
>
>
> On Fri, Apr 15, 2016 at 10:23 AM, w9ya <w9ya at qrparci.net> wrote:
>
> > Um, please check with your L3CC.....quite a few of them do NOT want you
> to
> > fly with switches in series with your charges !!
> >
> > Best regards;
> >
> > Bob F.
> >
> > On Fri, Apr 15, 2016 at 9:57 AM, Rob Derstadt <rderstadt at gmail.com>
> wrote:
> >
> >> Hello,
> >>
> >> I'm trying to work out how to wire up the outputs of two Telemetrums
> (one
> >> primary, one backup) so that I can add an extra arm/disarm rotary switch
> >> between the outputs and the terminal blocks (the NAR L3 requirement to
> cut
> >> power completely from the pyro's).
> >>
> >> This is my initial wiring diagram:
> >>
> >>
> >>
> https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
> >>
> >> Normally I'd just *try* it and see what happens, but I don't want to fry
> >> two board if I get it wrong. I'm also concerned that in the "safe"
> position
> >> that the continuity indicator on each board would still indicate
> everything
> >> green, which could lead to a launch with the pyro's inhibited.
> >>
> >> Has anyone flown this configuration before? If so, any suggestions on
> how
> >> to hook it up?
> >>
> >> Thanks guys.
> >>
> >> -Rob
> >>
> >> _______________________________________________
> >> altusmetrum mailing list
> >> altusmetrum at lists.gag.com
> >> http://lists.gag.com/mailman/listinfo/altusmetrum
> >>
> >>
> >
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> ------------------------------
>
> Message: 4
> Date: Fri, 15 Apr 2016 09:37:09 -0700
> From: Chris Attebery <chrisattebery1971 at gmail.com>
> To: w9ya at qrparci.net, Altus Metrum <altusmetrum at lists.gag.com>
> Subject: Re: [altusmetrum] Advice on wiring dual Telemetrums for
>         arm/safe?
> Message-ID:
>         <
> CAP5dJdSNVxmzGHC_D_NqYxxTkc45Q43YApWUtX_Zkm+jq--dWQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> I'm pretty sure that NAR dropped that requirement. If your L3CC is
> insisting I'd find another.
>
> I'm keeping my L3 wiring EXTREMELY simple. Both altimeters will be direct
> wired to the charges and use a screw switch to the enable pins. No safe
> switches, shunts, or terminal strips to intruduce points of failure.
>
> On Fri, Apr 15, 2016 at 9:23 AM, w9ya <w9ya at qrparci.net> wrote:
>
> > Um, please check with your L3CC.....quite a few of them do NOT want you
> to
> > fly with switches in series with your charges !!
> >
> > Best regards;
> >
> > Bob F.
> >
> > On Fri, Apr 15, 2016 at 9:57 AM, Rob Derstadt <rderstadt at gmail.com>
> wrote:
> >
> >> Hello,
> >>
> >> I'm trying to work out how to wire up the outputs of two Telemetrums
> (one
> >> primary, one backup) so that I can add an extra arm/disarm rotary switch
> >> between the outputs and the terminal blocks (the NAR L3 requirement to
> cut
> >> power completely from the pyro's).
> >>
> >> This is my initial wiring diagram:
> >>
> >>
> >>
> https://github.com/robderstadt/NAR-L3-Project/blob/master/images/plans/GizmoXL_Wiring.png
> >>
> >> Normally I'd just *try* it and see what happens, but I don't want to fry
> >> two board if I get it wrong. I'm also concerned that in the "safe"
> position
> >> that the continuity indicator on each board would still indicate
> everything
> >> green, which could lead to a launch with the pyro's inhibited.
> >>
> >> Has anyone flown this configuration before? If so, any suggestions on
> how
> >> to hook it up?
> >>
> >> Thanks guys.
> >>
> >> -Rob
> >>
> >> _______________________________________________
> >> altusmetrum mailing list
> >> altusmetrum at lists.gag.com
> >> http://lists.gag.com/mailman/listinfo/altusmetrum
> >>
> >>
> >
> > _______________________________________________
> > altusmetrum mailing list
> > altusmetrum at lists.gag.com
> > http://lists.gag.com/mailman/listinfo/altusmetrum
> >
> >
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