It doesn't look like propellant to me. The sparks don't appear to be smoking,
what's more, it's unlikely you would include a geometry that produced slivers
that could easily separate like that. Both Finocyl and Star geometries
generally regress to triangular slivers that have a reasonable case/liner
bonding area in relation to the sliver volume.
Troy
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Gerald Taylor
Sent: Friday, 26 August 2016 4:02 AM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Sparks from a SLBM
If the grain geometry was chosen to have extra thrust for a short time after
ignition which would seem reasonable to me, the easiest way to do that is to
have the bottom of the grain stack be finocyl or star or something similar. It
may be remaining slivers of propellant breaking off that we are observing. The
timing seems about right.
Gerald
-----Original Message-----
From: John Schilling <John.Schilling@xxxxxxxxxxxxxx>
Sent: Aug 25, 2016 6:52 AM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Sparks from a SLBM
The grid fins on the Musudan (another North Korean missile) are rigidly
attached at two points, hence purely a passive stabilizing device
rather than an active control. Seems unlikely they would be changing
their design practice when they finally have something that works, and
there isn't going to be an absolute performance goal for an SLBM that
would justify doing something risky like jettisoning vanes for maybe an
extra
50 km range - unlike a land-based site, the boat can just sail another
50 km closer to the target.
John Schilling
On 8/25/2016 1:02 AM, George Herbert wrote:
Thanks Bruno.
Another theory I came up with:
It has both grid fins and thrust vanes. They may jettison the vanes
once it's moving fast enough for the grid fins to be fully
effective..,
George William Herbert
Sent from my iPhone
On Aug 25, 2016, at 12:38 AM, Bruno Berger <mailinglists@xxxxxx> wrote:
100% solid. Broken loose igniter seems a good possibility for the
second event. The first maybe comes from the the metallic cap (or
remnants of
it) which closes the throat. Seen that from Russian SAM's
Bruno
Am 25.08.2016 um 08:40 schrieb George Herbert:
I am pretty dang sure it's a solid. The liquid SLBM tries all CATOed.
Igniter falling out might be it...
George William Herbert
Sent from my iPhone
On Aug 24, 2016, at 11:31 PM, "Troy Prideaux"
<troy@xxxxxxxxxxxxxxxxxxxxx <mailto:troy@xxxxxxxxxxxxxxxxxxxxx>> wrote:
Assuming we’re all in agreement that it’s a solid? Maybe part of
the ignition system breaking loose and being extruded?
Troy
*From:*arocket-bounce@xxxxxxxxxxxxx
<mailto:arocket-bounce@xxxxxxxxxxxxx>
[mailto:arocket-bounce@xxxxxxxxxxxxx] *On Behalf Of *George ;
Herbert
*Sent:* Thursday, 25 August 2016 3:55 PM
*To:* Arocket List <arocket@xxxxxxxxxxxxx
<mailto:arocket@xxxxxxxxxxxxx>>
*Cc:* george.herbert@xxxxxxxxx <mailto:george.herbert@xxxxxxxxx>
*Subject:* [AR] Sparks from a SLBM
Again crowdsourcing a missile question...
Video the North Koreans released from their SLBM test earlier today.
Most of the way up (in these shots) there's a pyro event of some
sort with many sparks, but the rocket keeps going.
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.youtube.c
om_watch-3Fv-3DxRAznz8C-2DC4&d=DQIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOU
HhpN0H8p7CSfnc_gI&r=rPTfWqtJdrL0Ber-yr0E_hSjRXuvJH6ZmQx03u8-2as&m=
b-VVM-pSC8x6YvLp6h6qGChPLqTRAvrB919pEO88mCw&s=tlz95A4KMkNq6zw6ADeb
UZsPHyxzQrcV5LioY11l0iI&e=
Anyone have ideas what the sparks / event were?
Similar sparks at first stage ignition but I think the second one
is not a staging event.
Dave Schmerler at Monterey Middlebury Institute / Center for
Nonproliferation Studies pointed me at the vids wondering if
deployment of suspected grid fins was one of the spark showers. I
think neither, but putting it out there...
Thanks!
George William Herbert
Sent from my iPhone
