Northrop Grumman launches three military satellites using Minotaur rocket
Early this morning Northrop Grumman successfully used a former Minuteman rocket repurposed as a commercial rocket dubbed Minotaur to launch three military reconnaissance satellites for the National Reconnaissance Office.
The rocket’s solid-fueled stages were in themselves amazingly old.
The 69-foot-tall (21-meter) rocket is based on leftover solid-fueled motors from the U.S. Air Force’s Minuteman missile program. Designers added two Orion solid rocket motors on top of the lower two stages of a Minuteman missile to turn the bomb carriers into satellite launchers.
The Minotaur 1 rocket’s M55A1 first stage motor was cast with solid propellant in 1966 by Thiokol, now part of Northrop Grumman. The SR19 second stage motor, produced by Aerojet, was filled with its solid propellant in 1983, according to a Northrop Grumman spokesperson.
The age of the first stage means it is likely the oldest rocket motor ever used on a space launch.
The leaders in the 2021 launch race:
18 SpaceX
16 China
8 Russia
3 Northrop Grumman
The U.S. now leads China 26 to 16 in the national rankings.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
Early this morning Northrop Grumman successfully used a former Minuteman rocket repurposed as a commercial rocket dubbed Minotaur to launch three military reconnaissance satellites for the National Reconnaissance Office.
The rocket’s solid-fueled stages were in themselves amazingly old.
The 69-foot-tall (21-meter) rocket is based on leftover solid-fueled motors from the U.S. Air Force’s Minuteman missile program. Designers added two Orion solid rocket motors on top of the lower two stages of a Minuteman missile to turn the bomb carriers into satellite launchers.
The Minotaur 1 rocket’s M55A1 first stage motor was cast with solid propellant in 1966 by Thiokol, now part of Northrop Grumman. The SR19 second stage motor, produced by Aerojet, was filled with its solid propellant in 1983, according to a Northrop Grumman spokesperson.
The age of the first stage means it is likely the oldest rocket motor ever used on a space launch.
The leaders in the 2021 launch race:
18 SpaceX
16 China
8 Russia
3 Northrop Grumman
The U.S. now leads China 26 to 16 in the national rankings.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
I thought solid propellant had a tendancy to sag after a few months/years and thus had an expiration date. Or is this just for the shuttle solid boosters?
Early this morning Northrop Grumman successfully used a former Minuteman rocket repurposed as a commercial rocket dubbed Minotaur…
Minotaur is not a commercial vehicle. It is a government-owned vehicle available only for government launches.
This may have been the last flight of the Minotaur I. If so, it retires with a perfect 12 for 12 record. There’s a Minotaur IV launch scheduled for later this year, and I’m hearing perhaps one more launch for an unspecified Minotaur variant, but that will probably be it.
If the new startups of Firefly and Virgin Orbit are successful, it’s going to be hard to justify Minotaur I’s $29 million price tag.
I thought solid propellant had a tendancy to sag after a few months/years and thus had an expiration date. Or is this just for the shuttle solid boosters?
Just for the ultra-large SRBs like the Shuttle and SLS boosters. ICBMs and SLBMs wouldn’t be of much use if they only had a shelf life of a few months.
Wow!
Some solid fuels are more solid than others. Estes black powder motors are hard/dry, but AeroTech composite rockets are more like rubber or a pencil eraser. I‘ve heard of an ICBM with “grains” like peanut butter, periodically scraped out & replaced with new goop!
1966, and it still works – wow!
When I was in college in the early 1970s, our department was offered the guidance control computer from a decommissioned Minuteman missile for the cost of shipping. That was a very interesting machine – its main memory was a rotating disc. No instruction address register – each instruction indicated the location (on the disc) of the next instruction. Instructions were not necessarily stored sequentially on the disc – some instructions took so long that by the time the instruction completed, the disc had spun quite a few sectors.
Fascinating to think that the computer we had may have at one time sat on top of the rocket just launched!
https://en.wikipedia.org/wiki/D-17B
Andi,
Funny you should mention that. My old physics teacher had the guidance system from a Minuteman missile in his barn. I remembered it was in an eight or ten sided frame, a little bit over three feet long laying on its side and about two feet tall. There were other electronics as well. I think he was trying to either get the components out for his electronics class he taught or trying to salvage the gold off the boards.
Early on in his career he worked on the construction of the Minuteman silos. I assume that is where he got the guidance system from. I wonder what else he had from those sites…
When I lived in a Nashville, TN I had a retired neighbor that I used to chat with, he and his wife loved our kids, sorta adopted grandparents. After about 3-4 years I was talking to him about space stuff (probably while we were having a beer and he was reloading) and he said, you do know I worked on the minuteman project don’t you? I had no idea. Anyway, he was a young man enlisted in the Air Force and just ended up there. Boeing end up sending him to college for an engineering degree and he worked on a bunch of the rockets that went to the moon!! I cannot remember which ones but he had a patch for them all framed in a shadow box. Best neighbors I’ve ever had!
I like old tech. Less vulnerable…esp fom the 7Os
After I retired from the Army, I went to work for IBM in the Hudson Valley. There were still some veterans of Federal Systems Division around and I encouraged them to tell stories of the early days.
IBM Kingston at one time had 10,000 people working on SAGE, NORAD’s (and the world’s) first computerized air defense system. Each Sector Control computer was so big, they built an entire four story building around each of them – https://en.wikipedia.org/wiki/Semi-Automatic_Ground_Environment – today your watch probably has more computer power, but at the time they were the largest and most powerful computers ever built. All tubes of course, not even transistors soldered to cards.
Of course, FSD was deeply involved in the manned space program – the primary on board computer for the Saturn launch vehicle was an IBM machine. Here’s a great video – https://www.youtube.com/watch?v=6mMK6iSZsAs – on it.
It’s worth noting that NASA had IBM use magnetic core memory deep into the Shuttle program long after it had become obsolete for other applications, on the basis of “If ain’t broke don’t fix it” Magnetic cores had got NASA to the moon, they could fly the space shuttle
https://en.wikipedia.org/wiki/IBM_System/4_Pi#AP-101
https://en.wikipedia.org/wiki/Magnetic-core_memory
As for gold, IBM Poughkeepsie had an operation dedicated to recovering the gold from machines that had been traded in or whose lease had expired. “Thar’s gold in them thar computers !”
Great stories by all!
“Minuteman – From Design To Delivery”
USAF / Boeing (1963)
https://youtu.be/WmSUoVJ1im0
20:10