marze

30 ms·

301.
by marze 12y ago
The US space shuttle also used hydrazine (not for primary propulsion, obviously) which is why it was met with people wearing hazmat suits on the runway.
302.
by marze 12y ago
All the more sobering knowing that antibiotics are routinely given as "placebo" to patients with no bacterial infection.
303.
by marze 12y ago
Doesn't the purchase of the bank's junky assets at above-market valuations go by the name "quantitative easing"? Is that what you are referring to?
304.
by marze 12y ago
And I don't think it a secret that most people do not think that plane will ever be completed. My comment about a secret project was referring to a hypothetical aircraft that is in operation but isn't publicly known.
305.
by marze 12y ago
No doubt, satellites can perform the role of the SR-71. My point is that the system we have in the US could not create a new SR-71 class airplane right now, in my view. It would run over budget, miss the performance targets, and be cancell
306.
by marze 12y ago
It is telling that the SR-71 has not been replaced with a better and faster plane. It appears that without Kelly and his organization, the government/contractor world is simply incapable of the task. In spite of material sciences adva
307.
by marze 12y ago
Much easier to get FAA approval, and less propellant is required compared to reversing course completely to land near the launch site on land. Launch trajectory is always over water for US launches, so if the rocket fails there are fewer pe
308.
by marze 12y ago
Yawn. Steve Jobs was right to fire this guy, you don't need to anything more than this paper to see that.
309.
by marze 12y ago
I don't see why Elon isn't more direct about addressing the company's early history. Why not say "I had to ditch the original founder of Tesla for various reasons, then work really hard to get our first car out at a qua
310.
by marze 12y ago
Sure: intuition, not anything in that paragraph besides the simple fact that the vehicle destroyed itself during rocket powered flight. You've got a hybrid motor, it's flown a number of times. You have a program that has been goi
311.
by marze 12y ago
Let us hope for Virgin's sake that "many times" doesn't mean six times for ten seconds each. I have heard of one long duration test on the plastic fuel reported by the "Virgin watchers" in Mojave, so unless the
312.
by marze 12y ago
A propulsion system that was "inherently safe" wouldn't have dangerous failure modes. Although Virgin has tried in the past to paint their hybrid prolusion system as being "inherently safe", it isn't. No 60kl
313.
by marze 12y ago
"Almost pointless" due to the vast differences in scale and complexity but still worthwhile, as a contrasting example of a solid safety culture employed by the Apollo engineering and operations teams. Although the Virgin 60,000 lb
314.
by marze 12y ago
Another difference, the Apollo astronauts carried slide rules to do calculations during the mission.
315.
by marze 12y ago
True. But it is almost pointless to compare these two programs since Apollo was so much more complex. To put it in perspective, Apollo flew on a rocket with five engines producing 1,500,000 lbf thrust each, on the first stage alone. By co
316.
by marze 12y ago
Well you could be right, but it is very hard to imagine that being true since the plastic hybrid has only been tested once on the ground. Doing a flight test so soon would be totally insane. In any case, the disaster was undoubtably a res
317.
by marze 12y ago
"2. Like the sort used on Antares?" I think Paul McCartney was about 23 years old when the engines powering that Antares launch vehicle were fabricated in Russia in their race against the Americans to the moon. An antique liquid&
318.
by marze 12y ago
"1. They didn't stay with rubber/nitrous." This you believe so strongly because a news story stated it? Wait for the accident report. It will say "rubber".
319.
by marze 12y ago
Some say this is an "inevitable" result of pushing boundaries. No. This is the result of a poorly managed program. What they are doing is much easier than the Apollo program, which was well managed and had no in-flight failures
320.
by marze 12y ago
So before the engines were obtained by Orbital, the NK-33 had never even been flight tested?
321.
by marze 12y ago
Are you were claiming that there were no failures of the NK-33 engine on any of the four N1 flights that exploded during first stage burn?
322.
by marze 12y ago
So these engines were built when Paul McCartney was 23 years old? Apparently Orbital Sciences scoured the museums and antique shops in Russia and picked up enough of these engines to base a new rocket on them. The reason they were surplus w
323.
by marze 12y ago
Wow, what an incredibly lame response. Everyone knows small studies may not be replicable, what else does this comment add? Reversing effects of Alzheimer's is incredibly rare, so doing so in a scientific and carefully observed manner
324.
by marze 12y ago
Solar panels have dropped so much in cost since 2009 that what used to be a cute, green-washing positive card for utilities to play is now a dangerous threat. If too many install solar they won't be able to make the payments on their e
325.
by marze 12y ago
I think post is pointing out that the foods haven't been tested to reduce chronic disease directly. The assumption that they would is because they have certain nutrients, and consumption of those nutrients has been associated with a r
326.
by marze 12y ago
No doubt the most insightful essay on Apple's wrist computer/watch so far, and HN allows it to be flagged to the bottom of the 2nd page. HN is broken.
327.
by marze 12y ago
Don't see your Jobs quote in this account, although there are many more skeptical quotes, such as "Jobs said he lived seven minutes from a grocery and wasn't sure he would use Ginger to get there." http://hbsw
328.
by marze 12y ago
With B, it doesn't need to fit into the old case size. You'd get a new case with new watch internals, the old one would be melted down, for an upgrade fee.
329.
by marze 12y ago
The fact that Apple is making the watch body out of solid gold (in one model) is interesting. It suggests: A. They will do future upgrades to the internals of the watch to make it current with the latest model. B. They will allow trade-in
330.
by marze 12y ago
The obstacles that nuclear power faces are formidable. One is that two other carbon-free options, solar and wind, are dropping in cost at a rapid rate at the same time that cost estimates for new nuclear plants are rising at a similarly rap

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