Re: STS-114 Touchdown (Color)
- From: charliexmurphy@xxxxxxxxx
- Date: Mon, 31 Mar 2008 10:35:44 -0700 (PDT)
On Mar 31, 12:16 pm, "max...@xxxxxxxxxxxxxx" <max...@xxxxxxxxxxxxxx>
wrote:
On Mar 31, 9:05 am, Dave Mayes <dmaye...@xxxxxxxxx> wrote:
On Mar 30, 3:45 pm, "max...@xxxxxxxxxxxxxx" <max...@xxxxxxxxxxxxxx>
wrote:
Okay, I just got some great feedback by E-mail. The IR video above is
on-again and off-again, as far as APU heat or fire. Thus the single
frame above doesn't settle any STS-123 issues.
JTM- Hide quoted text -
I viewed the STS 123 landing video. There does appear to be a fire
coinciding with nominal APU exhaust cycling. It emanates from the APU
exhaust
port 1 or 2 on the left side of the orbiter. I do not think the
flame/fire is nominal. Overheated hydrogen and/or ammonia would be the
most likely fuels causing the fire as they come in contact with
atmospheric oxygen after exiting the APU exhaust port. I have not seen
it on previous non IR landing videos of other orbiters. I have seen
nominal APU exhaust on IR videos and it is quite cyclical in nature.
Perhaps APU 1 or 2 overheated on this flight?
Dave
I agree. NasaSpaceflight has these snippets:
1) "minor damage"
2) "likely"
3) "suffered during touchdown and rollout"
4) "APU 1"
5) "pressure decay was noted on orbit"
6) "fuel tank leak"
7) "trouble shooting plan"
Your image analysis is also consistent with what I see at MSN, on the
IR video substituted for the STS-9 landing.
My speculative opinion is that at touchdown, when the orbiter starts
burning rubber, the hydraulic system for the brakes puts a large load
on the APUs. This may worsen any existing leak, but fortunately
shutdown is not far off. As the nose begins to drop, the APU fire is
fanned back. The drag chute and other improvements since the 1988 APU
upgrade help, but proper O&M is critical.
This APU situation is not a hypergolic one, as far as I know. So I'm
wondering about the ignition source for the fires seen both on the
STS-123 landing and at MSN, beginning at touchdown. Any possibility of
static electricity at landing?
JTM
There was no hydrazine leak. Only GN2.
There is no "situation" and nothing out of the ordinary.
If you could read NasaSpaceflight L2, you would see that there was no
issue. In the same L2, you can see videos of flames from other
landings and even on launches. But since you are an idiot, liar, and
generally no good, you were banned from NasaSpaceflight
.
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