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Long March 11 is a cold-launched rocket, based on a concept popular with military rockets. A gas charge is generated by the launch platform (often using a chemical gas generator) to eject the rocket from the launch platform before engine ignition. This saves the launch platform from having to manage hot exhaust gases, and reduces wear and tear on the launch ...

19

That's unburned $\mathrm{N}_2\mathrm{O}_4$. The zeroth and first stages of the Long March use $\mathrm{N}_2\mathrm{O}_4$ and $\mathrm{UDMH}$. The Dnepr uses the same propellants. I doubt that the red gas you see is from the cold launch system. That system uses a black powder mortar.

14

From Spaceflight101: For Shenzhou Missions, a stretched version of the typical Long March fairing is used ... Four aerodynamic stabilizers are attached to the upper part of the fairing that is part of the Launch Escape System in a escape scenario, those would deploy to stabilize the vehicle while flying under the Launch Abort Engines. The Fairing’s ‘wings’...

8

It's pretty rare to see popular news articles get technical details right, and this is no exception. The grid fins referred to in earlier QAs here are, as Polygnome notes, not maneuverable; they just act as passive stabilizers during LES aborts for the shroud-enclosed Shenzhou spacecraft. (See also this QA regarding the Soyuz grid fins.) The new article ...

5

Would this then be regarded as a single-stage-to-orbit, and a survivor of astronaut Don Petit's tyranny? No, Long March 5B uses strap-on boosters. From a certain level of abstraction, there's little difference between a two stage rocket and a one-stage rocket with strap-on boosters. I believe the core stage engines are ignited at liftoff, but it's hard ...

5

According to the paper from the 64rd International Astronautical Congress, Beijing, China The Development of the LOX/LH2 Engine in China; IAC-13, C4.1, 1x18525, the nozzle was welded from spiral-shaped elements. So the spiral pattern is here by design. The spirals are "dump-cooled", an old Rocketdyne idea described in this 1966 NASA Technical Note TN D-...

5

No. The 4 Soyuz boosters are RP1/LOX, this is a design that goes back to the R-7 that launched Sputnik 1. Thousands have been launched. Liquid boosters are a less common design than solids, but have been produced in greater numbers.

4

A Honda Civic is a two axle vehicle. It can tow a trailer. When it's towing a trailer, Civic-plus-trailer is functionally a three axle vehicle. There's no essential difference between a spacecraft with propulsion and a rocket stage. In this case, Long March 5 is a two-stage rocket because it's designed and built separately from the YZ stage. Long March ...

4

Those falling particles seem to be parts of a protective sheet that shields the opening around the interstage lattice between first and second stages. Only the Long Marches launched from Taiyuan and Jiuquan during colder times of the year have such cover. The following are a few examples to illustrate the presence and absence of the sheet in different times ...

4

@uhoh pointed to a tweet by LaunchStuff that shows images of what appear to be several Chinese notices to airmen (NOTAMs). (Weirdly, I can't find the originals of those; they don't seem to be in the international airman notification system, nor the corresponding system for notices to mariners) They show three danger areas, one of which is near Guam: Note ...

4

Is there anything meaningful to this difference [?] It shows that it's a much smaller stage with a hat. The height of the Chinese booster includes its top cone. A quick measurement on the pictures gives its height as 4.5m, leaving a useful height of 23 m. The stage is smaller, so the contribution of the engines to its height is larger. The length of the ...

3

This comment is too long to fit as a comment, so I'll write it as a partial answer. Was this really as close as call as they make it out to be if it fell just off the west coast of Africa? Definitions of "just missed" and "close call" are subjective, but we can think about the sensitivity of the final state to the initial state. A ...

2

Before we get into potential causes of the delay, I think it's important to say that the key focus of replacing CZ-2,3,4 wasn't to prevent booster on village syndrome it was to; To design a series of launch vehicles rather than one launcher made for a specific mission, so that to enhance China’s capability of entering the space. To apply the advanced ...

2

From to @TildalWave's comment So the color at the exhaust actually shows how well it is mixed with hydrazine at fuel / oxidizer injectors and the efficiency of the engine? I don't mean these first few seconds, but also later on. And another funny thing, dinitrogen tetroxide is apparently completely white at -196°C and below and gets darker red as ...

1

No. The Energia used kerolox strapons.

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