Hypersonic hype...

Post Reply
Message
Author
User avatar
TheGreenGoblin
Chief Pilot
Chief Pilot
Posts: 17596
Joined: Thu Aug 08, 2019 11:02 pm
Location: With the Water People near Trappist-1

Hypersonic hype...

#1 Post by TheGreenGoblin » Sun Oct 24, 2021 8:17 pm

The inimitable Sabine Hossenfelder...


Though you remain
Convinced
"To be alive
You must have somewhere
To go
Your destination remains
Elusive."

Boac
Chief Pilot
Chief Pilot
Posts: 17209
Joined: Fri Aug 28, 2015 5:12 pm
Location: Here

Re: Hypersonic hype...

#2 Post by Boac » Sun Oct 24, 2021 8:49 pm

She needs to sack her subtitle writer :-o

User avatar
TheGreenGoblin
Chief Pilot
Chief Pilot
Posts: 17596
Joined: Thu Aug 08, 2019 11:02 pm
Location: With the Water People near Trappist-1

Re: Hypersonic hype...

#3 Post by TheGreenGoblin » Sun Oct 24, 2021 8:56 pm

Boac wrote:
Sun Oct 24, 2021 8:49 pm
She needs to sack her subtitle writer :-o
I find her German accent strangely attractive. She is one very bright lady!

An interesting Rand report on this class of missile.

https://www.rand.org/content/dam/rand/p ... RR2137.pdf
Though you remain
Convinced
"To be alive
You must have somewhere
To go
Your destination remains
Elusive."

User avatar
TheGreenGoblin
Chief Pilot
Chief Pilot
Posts: 17596
Joined: Thu Aug 08, 2019 11:02 pm
Location: With the Water People near Trappist-1

Re: Hypersonic hype...

#4 Post by TheGreenGoblin » Mon Oct 25, 2021 4:28 am

None of these ideas are new of course. Eugen Sanger et al were actively working on many of these ideas in the late 1930's and throughout the Second World War as well.


Silverbird - Bredt-Sanger Antipodal bomber
General Walter Dornberger worked for Bell aircraft after the war and was a tireless advocate for Dyna-Soar. In 1952, the US Air Force decided to sponsor a study of Dornberger's manned hypersonic rocket-launched glider concept at Bell (Project BOMI). This study advanced and improved the Sanger-Bredt concept by developing, for the first time, a detailed "hot structures" concept. Non-load-bearing flexible metallic radiative heat shields ("shingles") and water-cooled leading-edge structures were to protect the wings while passive and active cooling systems would keep cabin temperature within human tolerance.

The boost-glide concept was refined by Dr. Qian Xuesen, the father of China’s space and missile program, while at the U.S. Jet Propulsion Laboratory (JPL) in 1951. The “skipping” also could involve energy management or “phugoid” porpoise-like measures in which the missile pitches up and climbs then pitches down and descends.

The Soviets recovered copies of Sänger's RaBo reports and were so fascinated with the concept (particularly Stalin, who seems to have been riveted by its implications) that they dedicated a great deal of effort to designing an updated RaBo equipped with huge ramjet engines for boost and cruise propulsion. The Soviet version of the Saenger antipodal bomber was intensely studied on Stalin's direct orders in 1946-1947. The final study concluded that, given the fuel consumption of foreseeable rocket engines, the design would only be feasible using ramjet engines and greatly advanced materials. This meant that development could only begin in the late 1950's, when such technologies were available. By that time the design had been superseded by more advanced concepts.

In 1958, an article which appeared in a Soviet aviation journal referred to a Russian glide-bombing system, capable of attaining an altitude of 295,000 feet and striking a target at a distance of 3,500 nautical miles. Later, an American aviation periodical reported that Russian scientists were developing an antipodal glide-missile, designated the T-4A. By March 1960, the Assistant Chief of Staff for Intelligence, USAF headquarters estimated that the Soviets were at least conducting research directed towards the development of a boost-glide vehicle.


Though you remain
Convinced
"To be alive
You must have somewhere
To go
Your destination remains
Elusive."

User avatar
TheGreenGoblin
Chief Pilot
Chief Pilot
Posts: 17596
Joined: Thu Aug 08, 2019 11:02 pm
Location: With the Water People near Trappist-1

Re: Hypersonic hype...

#5 Post by TheGreenGoblin » Mon Oct 25, 2021 4:51 am

For those who are interested in the physics and engineering maths relevant to this subject, this guy has put together a very good series of videos...



https://www.sciencedirect.com/topics/en ... onic-flows
Though you remain
Convinced
"To be alive
You must have somewhere
To go
Your destination remains
Elusive."

Post Reply