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Brokedownclimber
Trad climber
Douglas, WY
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I've recently been involved in an online discussion/argument on a spacenews.com thread, and my contention that the carbon fiber overwrap is a terrible idea was pooh-poohed by several other posters. I contended there's a major material incompatibility of carbon fibers (high surface area relative to mass) and LOX. The strength of carbon fiber is indisputable, but the idea of suspending exposed FUEL in an OXIDIZER is ludicrous. There should be several layers of a PTFE inert polymer as a multiple layer overwrap, enough to prevent direct Carbon-Oxygen contact.
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healyje
Trad climber
Portland, Oregon
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The strength of carbon fiber is indisputable, but the idea of suspending exposed FUEL in an OXIDIZER is ludicrous. There should be several layers of a PTFE inert polymer as a multiple layer overwrap, enough to prevent direct Carbon-Oxygen contact.
I would tend to agree that it seems like a bad idea given carbon fiber wrapping by itself is so susceptible to LOX infiltration. You'd think they could coat / seal / encapsulate it with something as it seems like type V COPVs, while dispensing with the inner liner, don't do anything about the carbon fiber overwrapping on the exterior.
I'm guessing the boys and girls at SpaceX probably have some strong opinions and ideas on next generation COPVs at this point. Would be curious to hear what they are.
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chainsaw
Trad climber
CA
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Think about it, Isreali satellite? Why is a US contractor allowed to indulge in the Starwars Space race in the first place? All they care about is money. It was a spy satellite that would have relayed all Isis social media to Isreal. Expanding the internet to Isis controlled parts of Africa is a bad idea. Soon, unregulated US space companies will set up a nuclear launchpad in space for North Korea if Kim pays them enough. Zuckerburg and Musk cannot and must not be trusted to deploy strategic technology period. This is the beginning of private sector tyrranny undermining and eventually circumventing democracy altogether. In my view, private companies cannot be trusted to represent US interests. They have a history of hurting us for profit and power. If Obama shot it down then its one good thing he did. Frankly I think the military shot it down without Obamas permission. No US private sector should meddle in Isreal or Isis politics. We ars at war there. If this launch was attempted in the seventies, Zuckerburg and Musk would be in Leavenworth for distribution of strategic defense technology to foreign powers. Let Isreal and Boko Haram build their own rockets and internet. We absolutely must stop helping them with their wars. As it stands we have been at war there for 25 years at a cost of about $1,000,000,000,000. When will it ever end. Zuckerburg swears that your privacy is safe but he puts tape on the cameras of his own laptop? Ask 2 billion facebook users if we should trust him and his liberal (fascist) agenda.....
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healyje
Trad climber
Portland, Oregon
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Nutjobbery and, to be clear, the fascists are about to assume command.
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healyje
Trad climber
Portland, Oregon
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Apr 11, 2017 - 07:00am PT
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Laser weapons edge toward use in US military
Lockheed Martin has just announced a 60-kilowatt laser weapon that soon will be installed on an Army truck for operational testing against mortars and small drones. The weapon can take out a drone from a distance of about 500 yards (457 meters) by keeping its beam locked onto the target for a few seconds, Jim Murdoch, an international business development director at Lockheed, told reporters this week.
i.e. worthless.
But before laser technology can be integrated into combat planes, it must first be shrunk in size. Currently engineers are running into physical limitations on how much portable power can be produced and ways of cooling the technology.
i.e. ain't going to happen anytime soon.
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