Across the high frontier: a Big Gemini space TL

Archibald

Banned
The aircraft still uses kerosene turbofan. LH2 is just kind of bonus to get at 30 degree steep climb and above 35 000 ft before releasing the rocket.


Yes, absolutely. Melvin Bulman, Aerojet, is the driving force behind T.A.N. There has been only three technical papers since 2006. It seems the idea is stalled per lack of interest from Aerojet upper brass. If anybody is interested I have the pdf you linked.
 
If anybody is interested I have the pdf you linked.

I didn't like to a PDF tho...

I guess you meant a PDF on the subject of the thing I linked to? It sounds interesting, certainly.

It seems the idea is stalled per lack of interest from Aerojet upper brass.

I don't really get why... Thrust augmentation seems like a great way to push engine cost and complexity down, and both are major contributors to launch costs.

fasquardon
 
Fasquadron wrote:
So the carrier aircraft is being fitted with LH2 afterburners?
I would have thought the LH2 would be an awful aircraft fuel.

Archibald wrote:
The aircraft still uses kerosene turbofan. LH2 is just kind of bonus to get at 30 degree steep climb and above 35 000 ft before releasing the rocket.

It's a way to boost the thrust of a high-bypass turbofan engine by inducing hydrogen into the bypass duct and burning it.
(https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19710009407.pdf)

Hydrogen is used due to the (average as you're trying to modify the engine as little as possible) short duct length. In short it provides a burst of power so that the aircraft can enter a high angle, (Angle of Attack) zoom climb and still retain thrust/control without stalling. (Another suggested applications that were studied was allowing a high-bypass turbofan to exceed trans-sonic speed for limited times)

US work on the concept was mixed, it worked but there was arguments that more thrust was needed to ensure a properly high AoA, (up to 70 degrees to the local horizon) so studies were also done using a rocket engine mounted in the carrier aircraft, (this case normally a 747 though using the C5 was studied as well) instead of or to supplement the duct-burning.

Just so we're clear on what the concept is; You want a high AoA for the launch vehicle at 'light-off' so that it does not have to provide the transitional energy (from 0-to-whatever angle) itself. For example, Pegasus uses wings and its own rocket to perform the turn and the wings and structure, (it's all solids so it is already pretty heavy a liquid booster would need specific reinforcements hence added mass along with the added mass of wings) to the vehicle GLOW and all the downstream effects thereof. So if you can get the carrier aircraft to a high AoA upon release then the LV has that much less angle it has to provide and therefore you get more payload to orbit. As a safety bonus, (yes while performing maneuvers the original aircraft wasn't designed for IS somewhat dangerous there are other concerns for air-launch you want to avoid :) ) the LV is now behind and below the aircraft which relieved of the LV mass can get out of Dodge before light off. This means there's no "Whoa!" moment like there was a Spaceship One crossed in front of White Knight 1 during launch :)

And just so we're also clear a similar, (no duct-burning or high AoA flight/zoom climb just regular straight and level flight) process is used to launch Anti-Missile Test Targets, to launch the test article of the AirLaunch LV and even to launch a full-up Minuteman missile so It's a 'doable' concept :)

Randy
 

Archibald

Banned
IOTL the RD-701 (and MAKS spaceplane) had low priority because of Buran. ITTL they are rushed because of rumors about some major RLV breakthrough on the american side.
This mirror OTL shuttle / buran process except a decade later.
The RD-701 sheer complexity (as mentionned by Michel Van) is a major issue hence further research led to TAN, which is a little more easier (kerosene in the exhaust and not in separate combustion chambers, turbopumps and all that machinery). According to the few technical documents and discussions I could find, TAN could be added to your usual LOX/LH2 rocket engine just like an afterburner can be added to a turbofan. TAN could be added to a big RS-68 or to a small HM-7B.
 
Hydrogen is used due to the (average as you're trying to modify the engine as little as possible) short duct length. In short it provides a burst of power so that the aircraft can enter a high angle, (Angle of Attack) zoom climb and still retain thrust/control without stalling. (Another suggested applications that were studied was allowing a high-bypass turbofan to exceed trans-sonic speed for limited times)

Ahhh. OK, this makes things clear. Thankyou.

IOTL the RD-701 (and MAKS spaceplane) had low priority because of Buran. ITTL they are rushed because of rumors about some major RLV breakthrough on the american side.

Hm. I hadn't come across that story. Do you have any idea what the RLV breakthrough rumor was?

The RD-701 sheer complexity (as mentionned by Michel Van) is a major issue hence further research led to TAN, which is a little more easier (kerosene in the exhaust and not in separate combustion chambers, turbopumps and all that machinery). According to the few technical documents and discussions I could find, TAN could be added to your usual LOX/LH2 rocket engine just like an afterburner can be added to a turbofan. TAN could be added to a big RS-68 or to a small HM-7B.

That does beg the question of why there aren't any TAN rocket engines already. I would have thought it would have made a nice addition to the RS-68, for example, allowing the engine to use a smaller and cheaper turbopump. Did the concept just come along too late?

fasquardon
 

Archibald

Banned
The RLV breakthrough will be revealed soon :p

Did the concept just come along too late?

Never too late good ideas never dies, let's hope it escape Aerojet control someday and fall into public domain. Or that Mev Bulman decides to pull some kind of Elon Musk.
 
Did the concept just come along too late?

Never too late good ideas never dies, let's hope it escape Aerojet control someday and fall into public domain. Or that Mev Bulman decides to pull some kind of Elon Musk.

Thought I'd pointed this out here but actually I think it was over in "Right side up", :::::shrug:::: anyway... This isn't the first time Aerojet has worked on or patented "Thrust Augmentation" in a rocket nozzle. Their first was sometime around the early 60s and this appears that someone 're-invented' this and Aerojet ran with it. Dan Delong IIRC also discussed it in an air launched concept in the 70s so this keeps coming up. It seems that many viable concepts are lost in the shuffle with those that get major funding and (usually) flight hardware being the ones most people hear about.

One thing I love pointing out to Skylon-fans is (unfortunately) work done in the late 50s and early 60s on the "Aerospaceplane" program ACTUALLY can be found to have pointed to everything the REL has proposed as by-products of research during the program that were never pursued simply because they were NOT the 'outcome' that the program directors were specifically looking for! Once the math showed that there was no theoretical upper limit to the speeds achievable using super-sonic combustion in a ramjet engine almost all other research lines in air breathing propulsion were dropped in favor of the SCramjet. And here we are...

"Facing the Heat Barrier" is a great history of the subject but what most people miss is that both the SCramjet concept/theory and the Bussard Interstellar Ramjet concept date from the same time and what is clear that once researchers got the idea that they could proceed, (again in theory) from zero to SCramjet to Interstellar Ramjet they pretty much blindly made the conceptual leap to follow that, and ONLY that, exact path.

It's a damn shame but the truth is there are a literal ton of existing research and development that for one reason or another, (and almost always NOT because it didn't work) got lost and lays waiting to be rediscovered. And it's a shame because when it IS rediscovered the most common reaction will be "well if it wasn't done before then there was clearly something wrong with it and it won't work now" and it goes back on the trash heap.

Randy
 

Archibald

Banned
There are indeed a crapton of (pretty cool) RLV concepts and ideas that are ignored. In the 90's only, in the days of Teledesic monster satellite constellation there was all kind of cool RLVs that didn't go anywhere due to the dot-com burst. Starbooster, Eclipse astroliner, Rocketplane pathfinder, Kistler K-1 were pretty innovative.
The AIAA website is crammed with good ideas that went nowhere.

My opinion on scramjets here
https://www.alternatehistory.com/fo...nts-open-thread.260554/page-347#post-14362247

I'm still amazed / pissed-off / angered at the way Tony DuPont oversold Copper Canyon to DARPA by 1983, leading to X-30 and Orient Express. It is a shame.
 
pop culture (5) techno-thriller : Space station Zvezda

Archibald

Banned
November 25, 1983

"Today the soviet Union orbited a new space facility aimed at peaceful purposes. Called Zvezda, the module features eight docking ports, and it only is the first element of a very large orbital complex, itself to become the hub of a network of civilian multipurpose platforms derived from the current Salyuts and Soyuz spaceships..."



The TASS press release evidently trumped noone. Launch of a large space station had been expected for years, yet the launch come amid extreme tensions. That autumn had been a gloomy one, packed with The Day After bleak movie, Able Archer, the INF crisis, KAL-007 shootdown, and that dreadful close call, on September 26, when the World had been as close from nuclear was as at the height of the Cuban crisis. That autumn it was as if doomsday would come from the air or space, one way or another.

Reagan and America had been rightly infuriated by death of Congressmen Larry McDonald, Jesse Helms and Steven Symms. It was bitterly noted that they had been killed while on their way to South Korea to attend a celebration of the 30th anniversary of the United States–South Korea Mutual Defense Treaty - only for their plane to be shot down by Soviet interceptor after straying into Soviet airspace.

That kind of very silly coincidence evidently did not helped cooling down Reagan usual anti-communist rethoric, which reached new heights in ferocity. Helms had been damn unlucky in fact, joinning McDonald aboard the doomed Jumbo in New York, after he already missed another plane and waited for two day airport that other flight that would ultimately kill them all !

Amid that only The Right Stuff stood for a civilian, light tone space program... but John Glenn had just announced he wouldn't be candidate to the democratic nomination. Rumours said that Glenn had had hard times at the Vice Presidency, so it was everything but a suprise... and Walter Mondale had happily filled the void.



***



Space station Zvezda is a techno-thriller written by Harry G. Stine under the nom de plume Lee Correy and published in 1985. The title is a reference to both novel and movie Ice Station Zebra of the 60's.

---

Ilya Patchikov and Ivan Popov could have been the first Soviet citizens to the Moon in August 1974. They have trained very hard – for weeks they worked eighteen hours a day. But at the last moment and to their great dismay the Politburo decided the mission will be entirely automated; and by a fitting irony for the first time the Soviet Moon machines perfectly worked, including the very troublesome N-1 rocket. And then the Soviet lunar program is cancelled as too late and too backwards when compared to Apollo.

From 1973 onwards the two frustrated cosmonauts get involved with the Apollo – Soyuz test program, visiting the United States and befriending American astronauts Pruett and Johnson. They learn about the Apollo – Soyuz radio link; they visit mockups of the future American space station. Within two years after the Apollo–Soyuz linking Popov and Patchikov hear of Sablin and Belenko defections, both due to the Brezhnev era stagnation and corruption, and are troubled by it. Growing more and more disillusioned by the late Brezhnev era ramping corruption Popov and Patchikov patiently elaborate a plot. At some point in the early 80's they learn that Pruett and Johnson are to man Liberty, so they decide to go into action.

They are send to space station Zvezda, an advanced orbital facility with artificial gravity provided by spinning around Salyut-like modules. After some days they pretext a health emergency, and an hurried undocking followed by a direct reentry. They then told ground controlled that the hurried undocking has consumed most of the Soyuz propellant, leaving them stranded in orbit. For a period they also shut contact with the ground. Meanwhile they use their Soyuz meagre propellant supply to get close from the American space station. But they can't dock – the rings are not compatible. And of course the American crew may refuse to accept them onboard.

The Soviet crew then elaborates an outrageous scheme to twist arm of the American crew.

The Soyuz first gets as close as possible from the Liberty airlock. Then the crew don their space suits before opening the Soyuz docking ring, depressurizing their spaceship. Popov crawls through the docking tunnel into space, and extends his arms outside the Soyuz, with the aim of gripping the American space station external airlock hatch with his gloved hands. Patchikov has to carefully manoeuver the Soyuz in order not to crush his crewmate. The daring manoeuver ultimately succeeds. Standing halfway through the Soyuz docking ring Popov then secures his position with a rope, while Patchikov uses him like an human ladder until he grasp, too, the Liberty airlock external hatch. But the Soyuz is still very close from the two cosmonauts, and there is a real threat they might be crushed by a collision between their spaceship and Liberty. Popov and Patchikov then try a radical approach: they forcefully and repeatedly kick the Soyuz with their feet so that it moves away from them, an exhausting ordeal that ultimately works. The American crew watch the scene, startled, and report to the ground, expressedly asking to welcome the cosmonauts onboard.

With the Soviet suit providing only six hours of life-support, the Americans have to take a difficult decision very fast. Under orders from the U.S government NASA order the Soviet cosmonauts to move back to their Soyuz and reenter Earth atmosphere. The space station crew will do his best to help the Soyuz desorbit, either with the robotic arm or using one of their Agena space tug.

But the Soviet crew refuse to comply. Ultimately Pruett and Johnson desobey orders and get the Soviets onboard, creating a dangerous situation. Once aboard space station Liberty Popov and Patchikov ask for political asylum in the United States.

The situation is made even more explosive considering the events happens late 1983, in an era of tension never seen since the Cuban crisis of 1962. Tension peaks as all of sudden Houston warns the Liberty crew that the Soviet have launched an I.S satellite killer near the American space station; they threaten to cripple the American space station. This prompt president Reagan to call Andropov on the red phone, with a heated exchange happening between the two men. Ultimately the Soviets desorbit the killer satellite as a gesture of goodwill.

Another threat is the abandonned Soyuz that dangerously drift near Liberty; the American crew decides to to use the robotic arm to pick up the Soviet spaceship and keep it at a safe distance from Liberty. A major issue is that the Soyuz lacks a grapple fixture compatible with the arm end. Instead the Liberty crew tries to clamp the arm end on a Soyuz antenna but the manoeuver goes awfully wrong. The antenna bends and breaks, sending the Soyuz tumbling into a wild spin, hitting and breaking the robotic arm. The Soyuz then strike Liberty, causing a small fire and damaging a solar array. Ultimately the Liberty crew decide to fire an Agena space tug to move the space station away from the battered Soyuz, and the manoeuver successfully clear the american space station from any danger.

Meanwhile Andropov is bargaining with Reagan. He will let the crew goes to the United States if Reagan roll back his Strategic Defense Initiative. Reagan, striken by Soviet panick vis a vis the Able Archer excercice and “The day after” gloomy movie decides to make concessions, perhaps through a meeting with Andropov.

In the end Reagan asks Congress to enact a bill granting asylum to the Soviet crew. A trust fund will be set up for them, granting them a very comfortable living. The meeting between Reagan and a terminally ill Andropov never happens, but it paves the way to Gorbatchev perestroika and the end of Cold War – earlier than in our universe, in 1987.

---

According to Stine himself “Well, Valery Sabline mutiny aboard a Soviet frigate in 1975 inspired Tom Clancy to write Hunt for Red October a decade later. Meanwhile the year after, in 1976 Viktor Belenko flew his MiG-25 to Japan and this inspired another techno-thriller – Craig Thomas Firefox, published in 1982.

In 1980 John Barron wrote a book about the Belenko case. According to Belenko himself when asked how long did he planned his escape, and what did it involve ?

“In terms of the evolution of my thoughts and making the conclusion to escape I do not have a precise time. I did make that decision based on my dissatisfaction with that country. I tried to do my best. I was one of their best fighter pilots. When I was young I was possessed by socialist and communist ideas which are very appealing because they promise full employment, free education, free medical care, good retirement, free child care, and so on. But later I discovered that those ideas were serving only a very small number of Communist nomenclatura, and the rest of the people were basically slaves. I made my conclusion that I could not change that system. The system is so big that there's no way I could change it or exist inside of it as a normal human being. For me, it was the best thing to divorce myself from that system. I was a fighter pilot, but that had nothing to do with my decision to escape. If I had not been a fighter pilot, I would still have found way to escape from that concentration camp. Even today, with all the slogans and all the freedoms, that country is still a closed society.

It took me a while to build the critical mass in my mind to make that decision, but the final decision I made a month before my escape, and when I made that decision I felt so good about myself! I felt like I was walking on the top of clouds. I felt free. But for me to achieve my objective I must have good weather in Japan and 100% fuel, and it took one month to have those two components in place. During that month I performed my duties so well that my commanding officers were ready to promote me. But on September 6, 1976 all components were in place. By the way, I did not steal the airplane. I had clearances. I just changed my flight plans slightly in the air.” Belenko concluded.

Stine later said “Barron's book about Belenko was fascinating. Then it occurred to me that, since 1978 NASA Liberty faced the OPSEK-Mir Soviet space station. The two were in very similar orbits, 51.6 degree inclined over the equator and 200 miles high. People were saying the situation was very similar to Berlin (before the wall), but in space. This stroke me – could a Soviet cosmonaut pull a Sablin or a Belenko, that is, flying his Soyuz to the American space station and asking for political asylum ? It was an exciting pitch for a novel or a movie script, and I decided to dug the concept further. It reminded me, somewhat, of Martin Caidin Marooned. When I started writing the novel late 1983 I could hardly imagine that the legendary Clint Eastwood would adapt it into a movie at the turn of the century, in 1999.

After the end of Cold War we learned, startled, that Soyuz contingency landing zones included the American prairies. There were landing points in Manitoba, Saskatchewan, North Dakota, Texas and, Oklahoma. The Texas (contingency !) landing point for Soyuz-33 at 33N, 97.6 W was actually quite close to Fort Worth.
Imagine the situation: at the height of Cold War, a Soyuz lands on goddam Texas, kingdom of anti-communism feelings in America. It would make for one hell of a culture clash !
 
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Thought I'd pointed this out here but actually I think it was over in "Right side up", :::::shrug:::: anyway... This isn't the first time Aerojet has worked on or patented "Thrust Augmentation" in a rocket nozzle. Their first was sometime around the early 60s and this appears that someone 're-invented' this and Aerojet ran with it. Dan Delong IIRC also discussed it in an air launched concept in the 70s so this keeps coming up. It seems that many viable concepts are lost in the shuffle with those that get major funding and (usually) flight hardware being the ones most people hear about.

Huh. Interesting.

My mind is a-whirl with what you could do if you added TAN to an NK-43, an RD-0120 or an RD-57.

Better ability to perform at sea level, 77% more thrust, effectively a wider throttle range... That makes for some really fun fantasy rockets.

@Archibald: Very cool update by the way. You should totally write that book now! It would make a great technothriller.

fasquardon
 
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Imagine the situation: at the height of Cold War, a Soyuz lands on goddam Texas, kingdom of anti-communism feelings in America. It would make for one hell of a culture clash !
That would be a Movie i need to see !
And I want to see this Clint Eastwood "Space station Zvezda"

but instead he made this cool movie
 
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