[altusmetrum] altusmetrum Digest, Vol 64, Issue 1

Chris Attebery chrisattebery1971 at gmail.com
Fri Apr 15 11:02:41 MDT 2016


Double check with your L3CC. I've read in several places that NAR dropped
that requirement. Personally I think it just adds complexity and more room
for human error.

On Fri, Apr 15, 2016 at 9:52 AM, Rob Derstadt <rderstadt at gmail.com> wrote:

> 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
>> -------------- next part --------------
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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
>> >
>> >
>> -------------- next part --------------
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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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>> End of altusmetrum Digest, Vol 64, Issue 1
>> ******************************************
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