Come on, can't anyone make a $400-$500 sub-laptop with a 7" screen? Anybody?
Re:Sounds perfect for Florida...
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Space-Age Houses
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· Score: 1
I'm tired of arguing with you. If you care to know why wings work, take a look at any aerodynamics book. Sheesh.
Re:Sounds perfect for Florida...
on
Space-Age Houses
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· Score: 1
There's nothing wrong with my understanding of dynamic pressure. If you take your typical airfoil, you'll find that there is a lift vector perpendicular to the airflow. This lift vector directly results from dynamic pressure. If you were to take a pressure measurement at the leading edge of the airfoil, you'll be measuring the static pressure + the dynamic pressure (ie, the total pressure), whereas if you where to measure the air pressure at the top of the airfoil, you'll only measure the static pressure (which is less than the total). You'll also be measuring the static pressure at the bottom of the wing, but since the airflow is slower below the wing than above it, it will be a higher pressure than above the wing due to the lower dynamic pressure. Make sense?
Re:Sounds perfect for Florida...
on
Space-Age Houses
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· Score: 1
You seem to be misunderstanding my original post. Air moving under the roof will create negative lift by reducing the static pressure below it. If the air moved underneath the roof at the same or greater speed as that above it, there would be a net zero lift on it, although you only need as much lift as the difference between its weight and positive lift to keep it attached (ignoring physical attachements to the foundation of course). Wings work by forcing air to move over them faster than below them not the other way around.
The equation for dynamic pressure is.5 * density_air * velocity^2 * area. Total pressure is equal to the dynamic pressure + static pressure. The total pressure outside the house is nearly the same as inside the house, but the static pressure (that measured by a barometer) is substantially different if the winds outside the house are strong (which is why windows blow out, not in). By opening the windows/doors of the house, you are lowering the static pressure in your house, thus helping keep the roof on it (at the cost of letting the storm in the house, of course).
The best solution is to simply attach a very sturdy/heavy roof to the house and shutter the windows to prevent them from shattering.
Re:Sounds perfect for Florida...
on
Space-Age Houses
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· Score: 1, Informative
The problem is when one or two windows are broken, allowing airflow through the house. Once that happens, you start to generate lift, which rips roofs off of houses.
You are partially right. Lift occurs when you have a high-velocity fluid moving above an object while a lower velocity fluid is moving below the object. In the case of a roof in a hurricane, there can be over 200kph winds above with 0kph below resulting in tremendous lift. If air was allowed through the house at the same speed (assuming an airflow parallel to the ground), the negative-lift generated inside the house would somewhat offset the lift occurring outside (a good thing). I believe in some places in the Caribbean, they open the front and back doors wide open to help keep the roof from blowing off.
The reason you shutter windows is to equalize the pressure on the outside of the window to prevent the window from shattering from the difference in air pressure (see dynamic vs. static pressure). Of course, it also blocks the windows from flying debris. The key to this technique is to fasten the roof strongly to the foundation of the house and make the roof strong enough to withstand the forces pulling on it (which are far greater than its own weight during a cat 4 hurricane).
Looking at the picture of the house, it seems that it would generate about as much negative lift as positive lift, making it able to withstand strong winds easily (so long as the structure between the roof and bottom are strong). The problem with it would be flying debris. Composites shatter and delaminate when struck hard. While the house may withstand a hurricane, it may need to be almost completely rebuilt to replace the damaged shell. Perhaps there would be a coating of vinyl and foam to protect it?
BTW, the grandparent post is wrong too. The air passing over the house is lifting it. The only force countering it is the negative lift from the bottom of the house and its foundation.
They can't force you, but a judge can make statements like "If this goes to trial and you're found guilty, I will recommend maximum punishment." Also, if the person can't afford bail they have to wait in jail for months before the trial whereas they can get out the next day (or so they're told) if they take the plea-bargain, little realizing that they will have to pay relatively large fees (most people in this situation are very poor) on probation for a substantial amount of time. And a poor, uneducated person simply has virtually no chance in defending themselves in court. And when paired with a unmotivated public defender has little chance of victory, regardless of innocence or guilt unless there's a substantial amount of evidence proving their innocence, the complete opposite of the way it should be.
Public defenders are not 'counter-prosecutors'. Prosecutors always have more experience and are paid better than public defenders. Prosecutors (as well as judges) also have the ability to coerce people into pleading guilty using threats of extreme punishment if the case goes to trial. The public defender has no tool to counter this (nor any desire since they are encouraged to keep cases from going to trial).
Ever heard of the 'plea-bargaining system'. It's the system where the great majority of people plea-bargain, ie, plead guilty to lesser charges so that they can get out of jail quickly and avoid severe punishment. For people who are truly guilty, they generally get punished less than they would if the case went to trial. For the innocent, they get punished for a crime they didn't commit (while the guilty person gets off scot free of course) and, if it's a felony, will have difficulty getting another job and will lose some of their Constitutional rights (such as voting). BTW, this is the system in place currently in the US.
We've been building bridges for a long time. Each succesive bridge that is built is very similar to another bridge that has been built before, making it significantly easier to build new bridges.
Bridges are essentially static whereas chips operate in a dynamic environment. This makes bridges easier to model accurately (although dynamic similation is much harder of course). Since bridges aren't performance driven like chips, they rarely push the envelope (ie, they have huge margins of error--this is affordable since each one is custom designed to some extent and doesn't significantly increase the cost anyway).
IMO, people generally have a more intuitive sense of how to design and build a bridge compared with designing circuit boards and chips.
During the revolution, there were tons of american "privateers" out to plunder and steal from British ships. All nice and legal according to the new congress.
That may have had something to do with the British conscripting American sailors into their Navy and stealing their cargos.
Unfortunately for users, computer equipment manufacturers and resellers don't adequately inform Windows users of the risks involved in accessing the Internet without proper security measures.
I don't know about computer manufacturers themselves (I always build my own), but every DSL and cable modem I've ever bought came with tons of warnings to use firewalls and anti-virus software (in fact, the last DSL modem I received has a pre-configured built-in firewall). Is there any broadband service provider that doesn't send the new customer manuals with rather large warnings inside? No amount of warning stickers/labels can inform the user who chooses not to read them.
Well then, what's your opinion if you were taking the poll yourself? Do you feel e-voting will be more accurate, etc.? Or do you agree with the software experts?
Partial benefit of the doubt: It's possible that the author forced them to change the title to something else after being slashdotted herself by angry geeks. The lawyer should have known better, based from what I've read from her own blog anyway.
My main gripe, other than the UI, was that Pro/Mechanica had a tendency of crashing (often) on my Windows 2000 box whenever I tried doing a simulation. I had a gig of ram too, so it ticked me off to some extent. Maybe it was because I was using the student version.
I didn't claim that it was a GOOD piece of software, just that it could do it. I agree, Pro/E is aweful and terribly expensive (so aweful that for an app like this it could conceivably be easier simply to right a custom app). I would have said a different app if I knew of one that could do it (I'm not aware of any).
If you think your experience was bad, you should try running Pro/E in Windows, probably the worst port ever of any app from Unix (at least back in 2001 when I was trying it out).
What makes you think that the Rutan team hasn't used a detailed design process? The feauture you mention of the code they're using can be done with software off the shelf, granted for a lot of money (Pro/E with Pro/Mechanica). Rutan designed and built two complex, composite structures for flight which simply can't be done succesfuly without detailed design work, almost certainly using an in-house CAD system designed for simulating composite material structures (probably they say as much on their website if I bothered to check).
Keep in mind that they are doing this more for long-term profit than to win the X-Prize and want to keep a competitive advantage by keeping as much secret behind their design process as possible.
Umm, money (or the lack thereof in this case)? How would Katie Jones defend herself when the other Katie desides to sue her for libel? Even if KJ had tons of money she would still lose since it would, in fact, be libel. And it is MUCH easier to win a case of libel in the UK than in the US AFAIK.
Thanks for the links. Back in high school the computer lab never gave me a score of higher than 65 WPM which I thought was pretty bogus. I just took one of those typing tests and it gave me a WPM of 80 (97% acc), and I'm a bit out of practice (at least compared to high school).
There wasn't really a 'net' back then, was there? Were you addicted to usenet, irc or some bbs? At the time I tried logging on to a local BBS and was bored stiff, so went back to playing Quake or Sim City 2000.
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Come on, can't anyone make a $400-$500 sub-laptop with a 7" screen? Anybody?
I'm tired of arguing with you. If you care to know why wings work, take a look at any aerodynamics book. Sheesh.
There's nothing wrong with my understanding of dynamic pressure. If you take your typical airfoil, you'll find that there is a lift vector perpendicular to the airflow. This lift vector directly results from dynamic pressure. If you were to take a pressure measurement at the leading edge of the airfoil, you'll be measuring the static pressure + the dynamic pressure (ie, the total pressure), whereas if you where to measure the air pressure at the top of the airfoil, you'll only measure the static pressure (which is less than the total). You'll also be measuring the static pressure at the bottom of the wing, but since the airflow is slower below the wing than above it, it will be a higher pressure than above the wing due to the lower dynamic pressure. Make sense?
The equation for dynamic pressure is .5 * density_air * velocity^2 * area. Total pressure is equal to the dynamic pressure + static pressure. The total pressure outside the house is nearly the same as inside the house, but the static pressure (that measured by a barometer) is substantially different if the winds outside the house are strong (which is why windows blow out, not in). By opening the windows/doors of the house, you are lowering the static pressure in your house, thus helping keep the roof on it (at the cost of letting the storm in the house, of course).
The best solution is to simply attach a very sturdy/heavy roof to the house and shutter the windows to prevent them from shattering.
You are partially right. Lift occurs when you have a high-velocity fluid moving above an object while a lower velocity fluid is moving below the object. In the case of a roof in a hurricane, there can be over 200kph winds above with 0kph below resulting in tremendous lift. If air was allowed through the house at the same speed (assuming an airflow parallel to the ground), the negative-lift generated inside the house would somewhat offset the lift occurring outside (a good thing). I believe in some places in the Caribbean, they open the front and back doors wide open to help keep the roof from blowing off.
The reason you shutter windows is to equalize the pressure on the outside of the window to prevent the window from shattering from the difference in air pressure (see dynamic vs. static pressure). Of course, it also blocks the windows from flying debris. The key to this technique is to fasten the roof strongly to the foundation of the house and make the roof strong enough to withstand the forces pulling on it (which are far greater than its own weight during a cat 4 hurricane).
Looking at the picture of the house, it seems that it would generate about as much negative lift as positive lift, making it able to withstand strong winds easily (so long as the structure between the roof and bottom are strong). The problem with it would be flying debris. Composites shatter and delaminate when struck hard. While the house may withstand a hurricane, it may need to be almost completely rebuilt to replace the damaged shell. Perhaps there would be a coating of vinyl and foam to protect it?
BTW, the grandparent post is wrong too. The air passing over the house is lifting it. The only force countering it is the negative lift from the bottom of the house and its foundation.
They can't force you, but a judge can make statements like "If this goes to trial and you're found guilty, I will recommend maximum punishment." Also, if the person can't afford bail they have to wait in jail for months before the trial whereas they can get out the next day (or so they're told) if they take the plea-bargain, little realizing that they will have to pay relatively large fees (most people in this situation are very poor) on probation for a substantial amount of time. And a poor, uneducated person simply has virtually no chance in defending themselves in court. And when paired with a unmotivated public defender has little chance of victory, regardless of innocence or guilt unless there's a substantial amount of evidence proving their innocence, the complete opposite of the way it should be.
Ever heard of the 'plea-bargaining system'. It's the system where the great majority of people plea-bargain, ie, plead guilty to lesser charges so that they can get out of jail quickly and avoid severe punishment. For people who are truly guilty, they generally get punished less than they would if the case went to trial. For the innocent, they get punished for a crime they didn't commit (while the guilty person gets off scot free of course) and, if it's a felony, will have difficulty getting another job and will lose some of their Constitutional rights (such as voting). BTW, this is the system in place currently in the US.
There's a registry entry you can alter to disable the key. If you google 'disable windows key' you'll probably find it.
The short answer:
That may have had something to do with the British conscripting American sailors into their Navy and stealing their cargos.
Unfortunately for users, computer equipment manufacturers and resellers don't adequately inform Windows users of the risks involved in accessing the Internet without proper security measures.
I don't know about computer manufacturers themselves (I always build my own), but every DSL and cable modem I've ever bought came with tons of warnings to use firewalls and anti-virus software (in fact, the last DSL modem I received has a pre-configured built-in firewall). Is there any broadband service provider that doesn't send the new customer manuals with rather large warnings inside? No amount of warning stickers/labels can inform the user who chooses not to read them.
So, if I understand you correctly:
- Set up a website.
- Stock scam out of people.
- Profit!!!
So, if I do frontal lobotomies on a bunch of scammers, I'll become rich from all the good karma I accrued, right?Or when the user forgets to remove it before going through security at the airport. Care to stay at the deluxe Guantanamo Bay resort...indefinitely?
Well then, what's your opinion if you were taking the poll yourself? Do you feel e-voting will be more accurate, etc.? Or do you agree with the software experts?
Partial benefit of the doubt: It's possible that the author forced them to change the title to something else after being slashdotted herself by angry geeks. The lawyer should have known better, based from what I've read from her own blog anyway.
My main gripe, other than the UI, was that Pro/Mechanica had a tendency of crashing (often) on my Windows 2000 box whenever I tried doing a simulation. I had a gig of ram too, so it ticked me off to some extent. Maybe it was because I was using the student version.
Be careful what you say, though. She is a lawyer, remember, and can sue you for (almost) free!
If you think your experience was bad, you should try running Pro/E in Windows, probably the worst port ever of any app from Unix (at least back in 2001 when I was trying it out).
Keep in mind that they are doing this more for long-term profit than to win the X-Prize and want to keep a competitive advantage by keeping as much secret behind their design process as possible.
Correct: I meant to say "freedom of the press" or some such...
Google it like I did if you don't believe me. Tabloids can hide behind free speech most of the time, you and I cannot.
Umm, money (or the lack thereof in this case)? How would Katie Jones defend herself when the other Katie desides to sue her for libel? Even if KJ had tons of money she would still lose since it would, in fact, be libel. And it is MUCH easier to win a case of libel in the UK than in the US AFAIK.
Thanks for the links. Back in high school the computer lab never gave me a score of higher than 65 WPM which I thought was pretty bogus. I just took one of those typing tests and it gave me a WPM of 80 (97% acc), and I'm a bit out of practice (at least compared to high school).
There wasn't really a 'net' back then, was there? Were you addicted to usenet, irc or some bbs? At the time I tried logging on to a local BBS and was bored stiff, so went back to playing Quake or Sim City 2000.
That's two words, BTW.