Re: Never assume soon means less than lifetime of Universe
Back in their salad days, Xerox PARC would put "Interim" into the name of any project they wanted to be long-lived.
17 posts • joined 12 Feb 2016
... the one that allows you to say what you want in the fewest lines. Most of these bug studies deal in bugs per line, not bugs per concept.
And the winner is ... whatever language has a library (or libraries) for the thing you're trying to do ! Library code is a lot more debugged than newly minted code, and it doesn't take many lines to invoke the goodness.
>> The last time the US imposed a luxury tax, the rich stopped buying yachts, putting yacht builders out of work.
No, actually. The rich stopped buying yachts built in America, putting American yacht builders out of work. Yacht builders elsewhere took up the slack. I really hated Bush for that move.
This technology is premised on the idea that I trust the hardware, so that's who should decide if incoming software is trusted.
But in practice, it looks like I trust a signed Linux kernel more than I trust some recent hardware. So it's not clear why I would pay for something whose function is to decide if it wants to argue with me.
>> The other option is to have enough battery capacity to allow flight to an emergency landing site (you don't need anything like full power for that).
> Unless of course, the plane misses the threshold and needs a go around.
And this is worse than a jet gliding into the airport, you're saying ?
>> I take it the companies are getting huge grants to develop these technologies?
No need for grants. Not everyone misunderstands the weights of things as badly as you do. A jet engine is much bigger than a turbine, and a gearbox that can transmit megawatts isn't light. Electric motors are light. Check out the NASA X-57 project. They expect a 60 kilowatt electric motor, plus its propellor, to weigh 57 pounds.
In the states, the FAA has actually had meetings with all the companies exploring similar designs, trying to work out the regulatory framework before the tsunami hits. Heck, there's a startup that has pre-sold its first 25 planes.
>> HS, I don't understand this "If the planes can take off and land on electric power alone, all of a sudden lots of airports can allow a larger number of flights especially at night"
>> Can you elaborate?
Dunno about 90-passenger regional transports, but two-person electric planes have been flown, and multiple reviewers (of multiple planes) all were thrilled about the reduction in noise.
>> I'll raise you baby monitors and WiFi.
I'll raise you EPROMs and radioactivity.
Back in the days of 1-kilobyte UV-erasable EPROMs, a customer called us, saying that the system he'd bought had stopped working.
Installing a fresh new EPROM fixed his box. But a month later, he called again.
Eventually, our field technician asked the critical question. Which was, what was on the other side of the wall ? Well, this was a human-occupied office. But the customer was Atomic Energy Of Canada, and the gear on the other side of the wall generated the odd particle or two. In fact, we calculated, it generated about enough particles to cause a one-bit erasure in about a month.
The technician moved the system down the hallway 30 feet, and the problem never happened again.
>>> Serious military-grade lasers work on large quantities of chemical fuel, and they do run out of ammo.
The military used to have lasers that used a reacting chemical as the laser medium. They've switched to solid lasers pumped by laser diodes. The diodes burn more than half the power, BTW.
>>> It has enough kinetic energy to punch through one side of the ship and out the other side
Yes, but high speed collisions spend some of that energy destroying the impactor. Which is why the talk of long rods - they leave a deeper crater.
>> A marketing blunder because most are aware that aircraft routinely fly safely on an autopilot. So name the system "Autopilot" implies it can do more than the typical driver assist system.
I fly an aircraft with an autopilot. It IS a typical driver assist system. What on earth makes you think otherwise ? Airlines secretly got their tech from space aliens, and haven't shared ??
"... On average, they will remain the same, one way will be faster, and the opposite direction will be slower."
No. I am a pilot, and one of the things we have to teach newbies is that it *doesn't* cancel out. In practice, the lose from a headwind is reliably bigger than the win from the tailwind going the other way. Any book aimed at student pilots will have a discussion of this.
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