Problem found with Angara’s most powerful version
The new colonial movement: Engineers of the most powerful variant of Russia’s next generation Angara family of rockets, the Angara A5, have found a serious design issue in the engines that they appear to be having problems solving.
The issue with the Angara A5 was brought to attention by scientists at rocket engine manufacturer Energomash in a paper ahead of a space conference later this month.
The paper, reported by RIA news agency on Friday and published online, said the engines of the Angara A5 could produce low frequency oscillations that could ultimately destroy the rocket.
A special valve had been fitted to mitigate the issue, but in some cases the oscillations continued, it said. Energomash did not immediately reply to a request for comment.
This sounds to me like “pogo,” a somewhat common issue with rockets. A resonance builds up within the engines during launch, and the vibration can grow strong enough to cause serious damage. The Saturn 5 had this issue during its second test launch, requiring a redesign of the upper stage engine hydrogen fuel lines.
With this history in mind, I would still not make that much of a big deal about this issue. The Angara A5 is a new rocket. It simply needs testing in flight followed by engineering revisions to work out these kinks.
The problem will be Russia’s government. Putin wants this rocket flying, for his own political purposes, and the question remains whether he will allow its proper engineering development to proceed at the correct pace. This does not mean development should be slow, but that failure is accepted and allowed for while you maintain a fast pace.
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From the press release: In this ground-breaking new history of early America, historian Robert Zimmerman not only exposes the lie behind The New York Times 1619 Project that falsely claims slavery is central to the history of the United States, he also provides profound lessons about the nature of human societies, lessons important for Americans today as well as for all future settlers on Mars and elsewhere in space.
Conscious Choice: The origins of slavery in America and why it matters today and for our future in outer space, is a riveting page-turning story that documents how slavery slowly became pervasive in the southern British colonies of North America, colonies founded by a people and culture that not only did not allow slavery but in every way were hostile to the practice.
Conscious Choice does more however. In telling the tragic history of the Virginia colony and the rise of slavery there, Zimmerman lays out the proper path for creating healthy societies in places like the Moon and Mars.
“Zimmerman’s ground-breaking history provides every future generation the basic framework for establishing new societies on other worlds. We would be wise to heed what he says.” —Robert Zubrin, founder of founder of the Mars Society.
All editions are available at Amazon, Barnes & Noble, and all book vendors, with the ebook priced at $5.99 before discount. All editions can also be purchased direct from the ebook publisher, ebookit, in which case you don't support the big tech companies and the author gets a bigger cut much sooner.
Autographed printed copies are also available at discount directly from me (hardback $24.95; paperback $14.95; Shipping cost for either: $5.00). Just email me at zimmerman @ nasw dot org.
The new colonial movement: Engineers of the most powerful variant of Russia’s next generation Angara family of rockets, the Angara A5, have found a serious design issue in the engines that they appear to be having problems solving.
The issue with the Angara A5 was brought to attention by scientists at rocket engine manufacturer Energomash in a paper ahead of a space conference later this month.
The paper, reported by RIA news agency on Friday and published online, said the engines of the Angara A5 could produce low frequency oscillations that could ultimately destroy the rocket.
A special valve had been fitted to mitigate the issue, but in some cases the oscillations continued, it said. Energomash did not immediately reply to a request for comment.
This sounds to me like “pogo,” a somewhat common issue with rockets. A resonance builds up within the engines during launch, and the vibration can grow strong enough to cause serious damage. The Saturn 5 had this issue during its second test launch, requiring a redesign of the upper stage engine hydrogen fuel lines.
With this history in mind, I would still not make that much of a big deal about this issue. The Angara A5 is a new rocket. It simply needs testing in flight followed by engineering revisions to work out these kinks.
The problem will be Russia’s government. Putin wants this rocket flying, for his own political purposes, and the question remains whether he will allow its proper engineering development to proceed at the correct pace. This does not mean development should be slow, but that failure is accepted and allowed for while you maintain a fast pace.
Now available in hardback and paperback as well as ebook!
From the press release: In this ground-breaking new history of early America, historian Robert Zimmerman not only exposes the lie behind The New York Times 1619 Project that falsely claims slavery is central to the history of the United States, he also provides profound lessons about the nature of human societies, lessons important for Americans today as well as for all future settlers on Mars and elsewhere in space.
Conscious Choice: The origins of slavery in America and why it matters today and for our future in outer space, is a riveting page-turning story that documents how slavery slowly became pervasive in the southern British colonies of North America, colonies founded by a people and culture that not only did not allow slavery but in every way were hostile to the practice.
Conscious Choice does more however. In telling the tragic history of the Virginia colony and the rise of slavery there, Zimmerman lays out the proper path for creating healthy societies in places like the Moon and Mars.
“Zimmerman’s ground-breaking history provides every future generation the basic framework for establishing new societies on other worlds. We would be wise to heed what he says.” —Robert Zubrin, founder of founder of the Mars Society.
All editions are available at Amazon, Barnes & Noble, and all book vendors, with the ebook priced at $5.99 before discount. All editions can also be purchased direct from the ebook publisher, ebookit, in which case you don't support the big tech companies and the author gets a bigger cut much sooner.
Autographed printed copies are also available at discount directly from me (hardback $24.95; paperback $14.95; Shipping cost for either: $5.00). Just email me at zimmerman @ nasw dot org.
Angara is flying the RD-191, which is basically the same engine Antares is using, the RD-181 (Export version of the RD-191).
It is interesting that Antares has not seen this issue.