The control room traces I think - not provable yet - are steering vane
actuation and response over time.
George William Herbert
Sent from my iPhone
On Mar 25, 2016, at 1:46 PM, John Schilling <John.Schilling@xxxxxxxxxxxxxx>
wrote:
I haven't seen video, and yes, I have to speculate as to why. But the
post-flight stills of a slightly charred but intact motor tend to rule out a
kaboom.
I have seen a still photo from the control room where a telemetry screen has
a figure of "57.4s" next to some data traces that are otherwise
unintelligible due to bad camera angle. That's a plausible burn duration
given the apparent case and nozzle size.
John Schilling
john.schilling@xxxxxxxxxxxxxx
(661) 718-0955
On 3/25/2016 1:31 PM, Henry Vanderbilt wrote:
So, still a "no" - that's an obvious liquid booster.
Looking at the stills of the big solid test, there were a few interesting
things to note. The four stubs around the exit nozzle, in one post-firing
closeup are obvious as SCUD (or V-2) style thrust-vectoring actuators+fins.
Considerably (and apparently not evenly) eroded by the firing, but at a
guess still enough left to function.
Which brings up another question: Has anyone seen a figure for the firing
duration?
Lack of video reminds me of a rule-of-thumb I tend to apply to western
commercial rocket propulsion PR releases: It's easy to make a rocket plume
look good in a still photo. Much harder in a video, if there's any
significant combustion instability leading to significant chamber pressure
variations.
Lack of video is not proof of still-unsolved combustion stability issues, of
course, but given how cheap and ubiquitous video is, and what impressive PR
a good rocket-firing video makes, it tends to be my immediate suspicion when
no video is forthcoming. FWIW.
Has anyone seen video who'd care to comment?
Henry
On 3/25/2016 12:57 PM, John Dom wrote:
https://urldefense.proofpoint.com/v2/url?u=http-3A__spaceflight101.com_north-2Dkorea-2Dkms-2D4-2Dlaunch-2Dsuccess_&d=CwIC-g&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=rPTfWqtJdrL0Ber-yr0E_hSjRXuvJH6ZmQx03u8-2as&m=Arzoi1PGVfbfNEqDUmDnFRQ41q6OFlQUxNSVDbAEAAc&s=UqEwvBPsEp7mpGag6eTBR2zV8Pc24vTq3kwWSEW0VQE&e=
and a few more sites with Google. Not a motor test but a launch though.
jd
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On
Behalf Of Henry Vanderbilt
Sent: vrijdag
25 maart 2016 19:41
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Video of HTPB/Al/perchlorate solids
I'll take that as a "no"...
On 3/25/2016 8:46 AM, John Dom wrote:
Sorry, cannot reveal my sources ;-).
jd
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx
[mailto:arocket-bounce@xxxxxxxxxxxxx] On Behalf Of Henry Vanderbilt
Sent: vrijdag 25 maart 2016 15:12
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Video of HTPB/Al/perchlorate solids
Is there video of the NK test out there anywhere public? I just did
some searching and could only find stills.
Henry
On 3/24/2016 10:29 AM, George Herbert wrote:perchlorate/HTPB etc propellant solid tests and flights. This is to
Looking for commercial / consumer grade video of aluminized
aid calibration and analysis of a North Korean solid motor test recently.
redistribute to the MIIS researchers with credit etc.
Any assistance appreciated, feel free to send straight to me, I will
Thanks!
George William Herbert
Sent from my iPhone
