China's Space Program News Thread

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Richard Santos

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The grasping end attachments seems very similar to the ISS Canadarm 2’s latching end effector:
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. The arm on the Chinese station core module does seem to be very similar to the Canadarm 2 overall in concept and execution.

According to the Russians, the arms on the two laboratory modules yet to be flown were supplied by Rosocosmos and were identical to the Ljappa arms used in the Mir station.
 
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KampfAlwin

KampfAlwin

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Richard Santos said:
The grasping end attachments seems very similar to the ISS Canadarm 2’s latching end effector:
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. The arm on the Chinese station core module does seem to be very similar to the Canadarm 2 overall in concept and execution.

According to the Russians, the arms on the two laboratory modules yet to be were supplied by them and were identical to the Ljappa arms used in the Mir station.
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Can I have a source on the Russian part? Videos like
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show the lab modules are placed by the arm, not lyappa.
 
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taxiya

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Richard Santos said:
The grasping end attachments seems very similar to the ISS Canadarm 2’s latching end effector:
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. The arm on the Chinese station core module does seem to be very similar to the Canadarm 2 overall in concept and execution.

According to the Russians, the arms on the two laboratory modules yet to be flown were supplied by Rosocosmos and were identical to the Ljappa arms used in the Mir station.
Click to expand...
To make sure we don't confuse, it's worth to note that there are probably TWO types of arms on the 1st laboratory module "wentian". One is the same type of arm like the one on the core module, but 5 meters long.

for @KampfAlwin too.
"Ljappa arm" that you talked about is probably for this in red circle below. However, if you are responding to post #8,602, then the video has nothing to do with "Ljapp arm".

No offence to Russians and I acknowledge that "Ljapp arm" is an effective and simple device to do its job. But I don't think most people here or in the Chinese engineer circle actually regards the type of device like "Ljapp arm" as robotic arm.

core.jpeg
 
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Mt1701d

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In case no one has yet to post about this YouTube channel, I thought I would post it here as it is an English Channel focusing on China’s space program and private sector space industry companies and/or ventures.

It’s a channel called Dongfang Hour, as far as I can see, they are objective about the subject matter and focus on news only. I recommend checking it out

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Richard Santos

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Nutrient said:
That won't matter (see below). Besides, it's likely that Criswell was being overly optimistic about the focusing abilities of the masers on the Moon; if the microwave beam spreads more than he thinks it will, the mirror orbiting Earth will have to be far larger (quadratic scaling) and therefore far more massive than he thinks.



As I have said, if the propellants come from Phobos they will be almost free. If the SPS's solar panels and the rockets launching them are made from lunar substances, the cost will be lower than creating a massive solar farm on the Moon (imagine all the highways that will have to be built). Especially if we use robots to assemble the SPS in GEO; it's difficult to imagine robots coping with the complex environment of the lunar surface (anytime soon).
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i am not sure why you have such confidence in Phobos have a large amount of water. published literature on Phobos indicate the outside of Phobos is not only devoid of ice or other volatile‘s, but completely devoid of any indication of hydrated minerals of any kind. In other words it is bone dry.

More recent Analysis of Phobos and demos tend to suggest they were probably accreted in situ around Mars from debris blasted off Mars by large impacts, and are not captured asteroids or comets. In other words, any water the material they were made from originally had would’ve been evaporated while being blasted off of Martian surface.
 
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Nutrient

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Richard Santos said:
i am not sure why you have such confidence in Phobos have a large amount of water. published literature on Phobos indicate the outside of Phobos is not only devoid of ice or other volatile‘s, but completely devoid of any indication of hydrated minerals of any kind. In other words it is bone dry.

More recent Analysis of Phobos and demos tend to suggest they were probably accreted in situ around Mars from debris blasted off Mars by large impacts, and are not captured asteroids or comets. In other words, any water the material they were made from originally had would’ve been evaporated while being blasted off of Martian surface.
Click to expand...

My main evidence for water on Phobos is the moon's low density: 1.8 g/m^3, while water is 1 g/m^3, rock is something like 3, and iron like 8. It is possible that Phobos is just a rubble pile: a lot of empty space inside the body could explain its low density as well.

As I have said, if Phobos has no water, we can substitute another body with abundant water, like the asteroid Ceres. Even at Ceres' distance the water would be almost free: we can use some of the mined water as propellant for moving the rest of the water. And the distance to the asteroid belt would hardly matter: once the first chunk of ice arrived from Ceres, more chunks of the stuff could be delivered at a steady pace, regardless of the distance.

With a steady supply of propellant for launching finished solar panels off the Moon, the SPS construction program would be quite efficient. We really could build enough of them to save the Earth from global warming.
 
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