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From: Miloch <Miloch_member@newsguy.com>
Newsgroups: alt.binaries.pictures.aviation
Subject: Watch the Military's Latest Rocket Launch Carrying a Secret Payload...& it's supposed to catch fire like this!
Date: 21 Jan 2019 19:30:10 -0800
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https://gizmodo.com/watch-the-militarys-latest-rocket-launch-carrying-a-sec-1831927745
for anybody. The U.S. military launched a Delta-IV Heavy rocket on Saturday from
Vandenberg Air Force Base in California, but its payload is a mystery. Why?
Whatever America just launched into space is for the National Reconnaissance
As the Associated Press notes, this mission, called NROL-71, has been delayed
time and again. First it was cancelled on December 7 and 8, 2018 because of
technical issues, then it was high winds on December 18, 2018, and finally they
had to scrub the launch again because of a hydrogen leak on December 20, 2018.
But this time they finally got it up.
The 30th Space Wing has released a video of the launch, conducted at Complex-6
at Vandenberg, which is pretty damn cool. You can watch it on YouTube or in the
embed below.
video ---> https://youtu.be/klb0QQJjSeQ
As the Associated Press points out, the video feed cuts off prematurely, which
before. Even NRO payloads that secretly went up with the space shuttle program
for that.
Ars Technica explains:
Developed during the 1990s by Rocketdyne, the expendable RS-68 engine was
on a cryogenic fuel mix of liquid hydrogen and liquid oxygen.
The fireball phenomenon manifests on the Delta IV Heavy rocket because of design
differences between the RS-68 and the Shuttle main engines, and because the
RS-68 fuel valve is open longer before the oxidizer starts flowing. Essentially,
at engine start-up, only liquid hydrogen is running through the engine, because
it is less chemically active than oxygen.
https://arstechnica.com/science/2019/01/fire-engulfed-the-delta-iv-heavy-rocket-on-saturday-and-thats-normal/
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