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#1920
by
Steven Pietrobon
on 27 Jan, 2020 05:35
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There was a hangfire. Go to 3:31:40 in the video to hear the count down, but the rocket did not ignite at T-0.
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#1921
by
russianhalo117
on 27 Jan, 2020 16:05
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PFRR Polar-NOx launch successful on third attempt:
Livestream recording for PolarNOx launch: . Commentary to begin ~3:15am AK time. Launch expected at 4:40am.
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#1922
by
Steven Pietrobon
on 27 Jan, 2020 22:42
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#1923
by
Steven Pietrobon
on 27 Jan, 2020 22:48
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PFRR Polar-NOx launch successful on third attempt:
Livestream recording for PolarNOx launch: youtube.com/watch?v=fyPYJQQf1Kg. Commentary to begin ~3:15am AK time. Launch expected at 4:40am.
Go to 2:28:50 in the video to watch the launch.
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#1924
by
Olaf
on 05 Feb, 2020 11:59
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#1925
by
Steven Pietrobon
on 06 Feb, 2020 03:24
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Launch video. Mission is FTU-2.
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#1926
by
Olaf
on 13 Feb, 2020 18:20
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https://defpost.com/u-s-navy-submarine-uss-maine-test-launches-trident-ii-d5le-slbm/The U.S. Navy conducted a test flight of an unarmed life-extended Trident II (D5LE) submarine-launched ballistic missile (SLBM) from Ohio-class ballistic missile submarine USS Maine (SSBN 741), on Feb. 12.
The scheduled, one-missile test flight was conducted on the Western Test Range off the coast of San Diego, California.
This launch marks the 177 successful missile launches of the Trident II (D5 & D5LE) strategic weapon system (SWS).
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#1927
by
Olaf
on 17 Feb, 2020 15:18
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https://www.navy.mil/submit/display.asp?story_id=112111USS Maine Successfully Tests Second Trident II D5LE Missile
The U.S. Navy conducted a scheduled one-missile test flight of an unarmed life-extended Trident II (D5LE) missile from USS Maine (SSBN-741), an Ohio-class ballistic missile submarine, on the Western Test Range off the coast of San Diego, California, today.
This test follows USS Maine's Demonstration and Shakedown Operation (designated DASO-30) conducted Feb. 12, also on the Western Test Range.
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#1928
by
Star One
on 23 Feb, 2020 11:42
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#1929
by
Steven Pietrobon
on 24 Feb, 2020 07:58
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Obviously, "Steve Trimble" is not an NSF member, as we've know for several years about China's Hypersonic Glide Vehicle (HGV) program!
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#1930
by
daedalus1
on 24 Feb, 2020 08:15
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Obviously, "Steve Trimble" is not an NSF member, as we've know for several years about China's Hypersonic Glide Vehicle (HGV) program!
Also what's it got to do with 'suborbital'. Suborbital to me is a parabolic flight out of the atmosphere, 50 or 62 miles high depending on your definition.
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#1931
by
Star One
on 24 Feb, 2020 16:34
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Obviously, "Steve Trimble" is not an NSF member, as we've know for several years about China's Hypersonic Glide Vehicle (HGV) program!
Also what's it got to do with 'suborbital'. Suborbital to me is a parabolic flight out of the atmosphere, 50 or 62 miles high depending on your definition.
Anything that doesn’t go into orbit is suborbital to me. ICBM’s don’t go into orbit.
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#1932
by
russianhalo117
on 24 Feb, 2020 23:38
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Obviously, "Steve Trimble" is not an NSF member, as we've know for several years about China's Hypersonic Glide Vehicle (HGV) program!
Also what's it got to do with 'suborbital'. Suborbital to me is a parabolic flight out of the atmosphere, 50 or 62 miles high depending on your definition.
Anything that doesn’t go into orbit is suborbital to me. ICBM’s don’t go into orbit.
Well most don't. Some have orbital capability.
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#1933
by
Star One
on 25 Feb, 2020 07:35
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The main reason I posted the above Tweet because I was sure his question had already been answered on here, and from the response above it seems I wasn’t misremembering.
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#1934
by
Rik ISS-fan
on 27 May, 2020 22:02
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For now I post this here, but possibly it deserves it's own topic.
I was wondering something; where/ when would a hybrid of liquid fueled suborbital rocket be better than a solid rocket?
Most sounding rockets use surplus military solid rocket motors. Missiles have a shelf live, if I'm not mistaken this is often 10-15years. After this time the SRM is most efficiently disposed by firing it.
For sounding rockets the rocket motors can be stowed longer because they are inspected before use.
Besides surplus motors there are new build solids. The BlackBrand V and Nihka, UP Aerospace/CTI Spaceloft XL, Oriole and S30/S31 are examples of frequently used new SRMs.
But instead of a new SRM, also a hybrid or liquid rocket could be build. But nearly always the hybrid or liquid rocket will be more expansive to build. (I'm not sure about development)
What would be a reason to go for a hybrid or liquid rocket?
Is it active roll control by thrusters using the same liquid propellants?
Is it the ability to modify thrust levels (G-loads) and flight path way easier?
Is it because of lower safety risks during transport an pad installation?
Is it the potential of lower cost when the system can be reusable?
I view a hybrid as a inert solid rocket motor with added complexity of a liquid propallent supply system. The inert solid blok is exposable, so why not build a larger SRM instead of a hybrid.
The reuse is expensive to develop, eats away performance and the risk of ending more expansive when the recovery fails is very high.
I get why Blue Origin did go for a liquid rocket with New Shepard and Virgin Galactic went for a Hybrid (Liquid byprop would have been beter) for SpaceShip two. With humans on board you require the capability to shut down the engine if something happens. And for BO NS was a way to develop first stage recovery technologie for NG.
But I find it difficult to see the benefit of a hybrid of liquid rocket above a solid rocket when reuse is doubtful.
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#1935
by
Steven Pietrobon
on 17 Jun, 2020 08:22
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http://en.people.cn/n3/2020/0617/c90000-9701401.html"Near space rocket-powered aircraft Beihang-4 successfully launched
(People's Daily Online) 10:39, June 17, 2020
The red-painted near space rocket-powered aircraft, codenamed Beihang-4, successfully launched and landed at its designated location after a 400-second navigation recently, marking its successful maiden flight and showcasing the results of Beihang's integrated project-based talent cultivation system.
Beihang-4 has a total length of 8.7 m and weighs about 1,300 kg. It consists of a solid-propellant rocket booster and a solid-liquid powered cruise aircraft.
This flight mainly aims to demonstrate and verify the possibility of powered near space flight with a level flight altitude of 24 km, a level flight speed of 3 Ma and a flight range of about 200 km."
Thanks to Andrew Jones for the link.
twitter.com/AJ_FI/status/1273166945114873865
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#1936
by
Satori
on 26 Jun, 2020 13:09
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On June 25, 2020, the Centro de Lançamento de Alcântara (CLA) - Alcântara Launch Center -, Brazil, conducted the suborbital launch of a small FTB Foguete de Treinamento Básico (Basic Training Rocket).
Launch took place at 2052UTC.
Apogee was a little over 30 km at 1 minute 15 second flight. Flight duration until impact in the Atlantic was not recorded, but the small solid fuel rocket was followed during 2 minutes 44 seconds.
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#1937
by
Steven Pietrobon
on 27 Jun, 2020 05:26
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#1938
by
Star One
on 24 Jul, 2020 15:57
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Despite numerous warnings of critical problems from experts within and outside the government over roughly 10 years, the cost to develop the now-canceled Redesigned Kill Vehicle program for homeland missile defense more than tripled, and the program’s schedule slipped by four years, a new U.S. government watchdog report reveals.
“At the time [the Defense Department] canceled the RKV program in August 2019, MDA [the Missile Defense Agency] had spent a total of $1.21 billion on RKV development — $340 million more than the agency’s original estimate for the entire RKV development effort, including eight initial production kill vehicles,” according to the Government Accountability Office report, released July 23.
The estimated cost increased by more than 230 percent from 2015 to 2019, the report said.
The Pentagon decided to take a “strategic pause” on the RKV in May 2019 before outright killing the program in August 2019. The department cited “technical design problems” as the reason for hitting the brakes and changing course.
https://www.defensenews.com/land/2020/07/23/canceled-missile-defense-warheads-cost-tripled-schedule-slipped-despite-numerous-warnings-gao-finds/All I can say concerning the above is this
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#1939
by
Steven Pietrobon
on 04 Aug, 2020 00:56
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