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#1
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Buran landing & night launch video
Notice how close it was to the ground, before it pulled out of the steep descent. And why do the tail nacelles look so much like jet engines? http://www.youtube.com/watch?v=3gjubQ7SB8I |
#3
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Buran landing & night launch video
On 12/16/2010 3:58 PM, Damon Hill wrote:
Because they were jet engines. However, the initial footage was not of the Buran orbiter but a manned trainer/analog with four turbojet engines capable of making a horizontal takeoff and powered landing. Engines were considered for both Shuttle and actual Buran orbiters, but were deleted to save weight and complexity. The operational one would have had only the two top engines on the sides of the vertical fin to allow it to fly for a considerable distance to a landing, but was not able to take off under its own power. Some translated info on the jet prototype and its engines he http://tinyurl.com/2dodokr http://tinyurl.com/2bhysn9 They were thinking of reinstalling the top jet engines on the orbiter at some point down the line if the Buran shuttles had become operational. Pat |
#4
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Buran landing & night launch video
Pat Flannery wrote in news:w-
hdakotatelephone: On 12/16/2010 3:58 PM, Damon Hill wrote: Because they were jet engines. However, the initial footage was not of the Buran orbiter but a manned trainer/analog with four turbojet engines capable of making a horizontal takeoff and powered landing. Engines were considered for both Shuttle and actual Buran orbiters, but were deleted to save weight and complexity. The operational one would have had only the two top engines on the sides of the vertical fin to allow it to fly for a considerable distance to a landing, but was not able to take off under its own power. Some translated info on the jet prototype and its engines he http://tinyurl.com/2dodokr http://tinyurl.com/2bhysn9 They were thinking of reinstalling the top jet engines on the orbiter at some point down the line if the Buran shuttles had become operational. Wondering if the four-engine version had any significant payload for additional fuel, and/or if a version with the same rocket engines as the flight version could have reached supersonic or even low hypersonic speeds--perhaps with aerial refueling? Transfer of LOX might have been tricky and probably no real point in the whole exercise. --Damon |
#5
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Buran landing & night launch video
Damon Hill writes:
Wondering if the four-engine version had any significant payload for additional fuel, and/or if a version with the same rocket engines as the flight version could have reached supersonic or even low hypersonic speeds--perhaps with aerial refueling? The flight version had no rocket engines apart from RCS and OMS -- the main engines were in the booster core (this was not just an external tank as with STS but a full booster). Transfer of LOX might have been tricky and probably no real point in the whole exercise. This, too. Jochem -- "A designer knows he has arrived at perfection not when there is no longer anything to add, but when there is no longer anything to take away." - Antoine de Saint-Exupery |
#6
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Buran landing & night launch video
On 12/16/2010 8:09 PM, Damon Hill wrote:
They were thinking of reinstalling the top jet engines on the orbiter at some point down the line if the Buran shuttles had become operational. Wondering if the four-engine version had any significant payload for additional fuel, and/or if a version with the same rocket engines as the flight version could have reached supersonic or even low hypersonic speeds--perhaps with aerial refueling? I get the impression that it was struggling just to get into the air, much less go supersonic. Its longest flight was only 32 minutes: http://en.wikipedia.org/wiki/OK-GLI ....and it only carried fuel for 30 minutes of powered flight. The orbital maneuvering engines didn't generate that much thrust; 17,600 kgf total (I don't even think real ones were installed on the jet-powered test version), and the wing leading edge was way too rounded and thick for accelerating to supersonic speed in level flight, and the nose was pretty high drag also. One has to remember that you _want_ to have a shuttle lose most of its speed via air drag on the way back for landing as it descends. The Space Shuttle does wide banking turns during reentry and landing to bleed off airspeed: http://www.columbiassacrifice.com/im...athDiagram.gif Pat Pat |
#7
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Buran landing & night launch video
On 12/17/2010 12:24 AM, Jochem Huhmann wrote:
The flight version had no rocket engines apart from RCS and OMS -- the main engines were in the booster core (this was not just an external tank as with STS but a full booster). One interesting thing is that Russia was trying hard to eliminate the use of toxic hypergolic propellants in all of its launch vehicles at the time, because of criticism by environmentalists and lawsuits by Kazakhstanies who had Proton stages come down on their land. Both the OMS engines and RCS system on Buran ran off of Lox/Kerosene. There's video of them cranking up one of the OMS engines and the RCS thrusters on this translated webpage: http://tinyurl.com/336odzo Pat |
#8
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Buran landing & night launch video
On 12/17/2010 6:20 AM, Pat Flannery wrote:
http://tinyurl.com/336odzo BTW, the "Synthol" mentioned on that webpage was a synthetic kerosene replacement that had a higher specific impulse, developed to allow the Soyuz booster to carry more payload into orbit. It was also known as "Sintin". Unfortunately, when the Soviet Union collapsed the only factory that produced it ended up in another country, and Russia no longer had access to it. Pat |
#9
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Buran landing & night launch video
The Space Shuttle does wide banking turns during reentry and landing to bleed off airspeed...
As does, FWIW, X-37B, though I don't know how the trajectory compares to the Shuttle's in terms of number and width of turns. |
#10
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Buran landing & night launch video
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