In atmosphere, temperature is actually the biggest determinant of speed of sound. I don't recall the eqn off the top of my head, and my textbooks are packed up.
Re:A Third of the Way There...
on
X43-A on to Mach 10
·
· Score: 4, Interesting
Saves a lot of mass, costs you a lot of drag. Say I need to have a rocket applying a 1000 lb force to do my mission. (Yes, I am radically simplifying numbers). In order to get that 1000 lb force out of a scramjet, the frontal area of the vehicle needs to be about four times as big as the rocket. Since wave drag (the primary component of the drag force on a body travelling supersonically) goes as the square of frontal area, you can see that this is not a winning strategy.
I don't believe air-breathing engines will ever make productive parts of the high-speed boost phase of a satellite launch. Now, something like Pegasus or SpaceShip 1 that uses a low speed air-breathing craft to get above lots of atmosphere, that's a pretty good idea.
Aha! Clarification is my friend. Thanks for the heads up. It seemed to me like he was implying that the Cadillac pickup trucks were some sort of one-off custom job, which is obviously not the case.
Hokay. I was cornfused. Neither the first nor the last time that will happen.
The Centris 610 and the Quadra 610 were exactly the same box. Same as the Performa 611X series and the PowerMac 6100. If I remember correctly, the only difference was a cache chip.
Sure there were some dumb Apple designs, but Performa was just a marketing label. The similar PowerMacs (52xx, 63xx) were the same hardware. If I remember correctly, the Centrises were completely replaced by the Quadras, with modest performance increases.
Unreported. There is no way to tell. I assume it's some service that Boinc installed and didn't uninstall. The dialog box does NOT report the name of the thing that crashed, which is why it's so annoying.
Oh well. It still does everything I need it to. Thanks for the heads-up. I'm going to go pore on the spec sheets and my bank balance again, and hope for a miracle. : )
Every time I boot the computer, I get a generic "Windows has detected a problem..." error message with no details. Click close, it appears again. Click close, appears again. Until I go into Task Manager and shut down dumprep and dwwin, the message box won't go away. This problem started after installing BOINC, and still occurs after uninstalling it.
If two of the most experienced chip fab companies on Earth are having trouble meeting demand, why would Apple want to try to beat them at that game?
I'd advocate moving to a proprietary AMD64-based architecture, but then I'd never hear the end of the idjits wanting a port that will run on their cheesy ass motherboard they got out of a box of cracker jacks, along with their Pro Audio Spectrum 16 sound card and Diamond Stealth 64 PCI video card.
Why would you let the facts get in the way of such a great rant?
That's pretty kick ass. I thought the PC card slot went away from the PowerBooks a long time ago. One more excellent reason to buy a 12" Powerbook. Woot!
My Performa 6100 was exactly the same hardware as the PowerMac 6100, except that it didn't come with a cache chip (that I got cheap on the Internet back in the day). This was true of many of the other Performa models.
Never did understand why the Performas got a bad rap. It was just a stupid branding strategy, not a bad computer.
Oh, and if you want to pick nits about the EXT not being a pickup, check this out. I think that's pretty clearly a pickup truck. Sure, it's FoMoCo, but they're the same damn thing.
XD and Smart Media may be useless to YOU, but those are the formats I use in my digital cameras.
So, yet again, I don't understand what's difficult about using either a USB reader or a cable. I mean, sure, it'd be cool to have an internal reader, but those Powerbooks are pretty tight on internal space. I'd rather have more battery volume than memory card slots.
Which card to support? CF? SD? MMC? Memory Stick? XD?
Why use a memory stick reader when you can just plug the camera in to the laptop?
I don't understand what you're on about. Powerbook already has wireless Ethernet, gigabit wired Ethernet, bluetooth, and a DVD burner. Plus firewire and USB2. I can see how you might have trouble connecting stuff to the computer. I mean, it's not like each of these ports are a different shape and only connect to one cable or anything...
It's BMW that has the much-maligned iDrive interface with the puck-shaped controller on the center arm rest. this article says that it's starting to suck less, but I'm not sure I'll believe that. I know for certain I'll never buy a car with a Microsoft-designed user interface.
Slashdot Mirror
No, you're pretty well spot on. Good job.
In atmosphere, temperature is actually the biggest determinant of speed of sound. I don't recall the eqn off the top of my head, and my textbooks are packed up.
Saves a lot of mass, costs you a lot of drag. Say I need to have a rocket applying a 1000 lb force to do my mission. (Yes, I am radically simplifying numbers). In order to get that 1000 lb force out of a scramjet, the frontal area of the vehicle needs to be about four times as big as the rocket. Since wave drag (the primary component of the drag force on a body travelling supersonically) goes as the square of frontal area, you can see that this is not a winning strategy.
I don't believe air-breathing engines will ever make productive parts of the high-speed boost phase of a satellite launch. Now, something like Pegasus or SpaceShip 1 that uses a low speed air-breathing craft to get above lots of atmosphere, that's a pretty good idea.
I haven't read anything good bad or indifferent on COMAND. Seems like every car that gets driven with iDrive, though, the reviewer says "THIS SUCKS!"
Anyhow. : )
Aha! Clarification is my friend. Thanks for the heads up. It seemed to me like he was implying that the Cadillac pickup trucks were some sort of one-off custom job, which is obviously not the case.
Hokay. I was cornfused. Neither the first nor the last time that will happen.
I realize I wasn't clear. I'm still waking up. : )
The external enclosure was identical for the 61x and 61xx boxes. The motherboards were obviously different.
The Centris 610 and the Quadra 610 were exactly the same box. Same as the Performa 611X series and the PowerMac 6100. If I remember correctly, the only difference was a cache chip.
Sure there were some dumb Apple designs, but Performa was just a marketing label. The similar PowerMacs (52xx, 63xx) were the same hardware. If I remember correctly, the Centrises were completely replaced by the Quadras, with modest performance increases.
Chip fab seems like it would be a ridiculously easy thing to be really, really bad at. It would be a huge risk.
Unreported. There is no way to tell. I assume it's some service that Boinc installed and didn't uninstall. The dialog box does NOT report the name of the thing that crashed, which is why it's so annoying.
Un-woot. : /
Oh well. It still does everything I need it to. Thanks for the heads-up. I'm going to go pore on the spec sheets and my bank balance again, and hope for a miracle. : )
Buy a PowerMac. Used. Stop whining.
Spoken like a true non-OSX user.
OSX's learning curve is very flat and very smooth. Unlike, say, Linux, which is much like trying to eat an elephant. Where exactly does one start?
Every time I boot the computer, I get a generic "Windows has detected a problem..." error message with no details. Click close, it appears again. Click close, appears again. Until I go into Task Manager and shut down dumprep and dwwin, the message box won't go away. This problem started after installing BOINC, and still occurs after uninstalling it.
If two of the most experienced chip fab companies on Earth are having trouble meeting demand, why would Apple want to try to beat them at that game?
I'd advocate moving to a proprietary AMD64-based architecture, but then I'd never hear the end of the idjits wanting a port that will run on their cheesy ass motherboard they got out of a box of cracker jacks, along with their Pro Audio Spectrum 16 sound card and Diamond Stealth 64 PCI video card.
And then calling Apple to get them to fix it.
Why would you let the facts get in the way of such a great rant?
That's pretty kick ass. I thought the PC card slot went away from the PowerBooks a long time ago. One more excellent reason to buy a 12" Powerbook. Woot!
My Performa 6100 was exactly the same hardware as the PowerMac 6100, except that it didn't come with a cache chip (that I got cheap on the Internet back in the day). This was true of many of the other Performa models.
Never did understand why the Performas got a bad rap. It was just a stupid branding strategy, not a bad computer.
Some people take vacation time.
Cadillac pickup truck. Looks pretty factory to me.
Oh, and if you want to pick nits about the EXT not being a pickup, check this out. I think that's pretty clearly a pickup truck. Sure, it's FoMoCo, but they're the same damn thing.
BOINC nuked my computer pretty good too. Very shoddy.
Just a data point, but I'm not going to be bothered to troubleshoot their software to donate to their project.
Maybe when it's out of beta I'll try again, but I've been having all sorts of weird problems ever since I tried that damn thing.
XD and Smart Media may be useless to YOU, but those are the formats I use in my digital cameras.
So, yet again, I don't understand what's difficult about using either a USB reader or a cable. I mean, sure, it'd be cool to have an internal reader, but those Powerbooks are pretty tight on internal space. I'd rather have more battery volume than memory card slots.
I have two words for you.
Secondary market.
If Apple is introducing a brand new iMac with a faster processor and a new design, it will NOT be lower cost than the current iMacs.
Which card to support? CF? SD? MMC? Memory Stick? XD?
Why use a memory stick reader when you can just plug the camera in to the laptop?
I don't understand what you're on about. Powerbook already has wireless Ethernet, gigabit wired Ethernet, bluetooth, and a DVD burner. Plus firewire and USB2. I can see how you might have trouble connecting stuff to the computer. I mean, it's not like each of these ports are a different shape and only connect to one cable or anything...
Exactly. What's the problem?
To pick a nit...
It's BMW that has the much-maligned iDrive interface with the puck-shaped controller on the center arm rest. this article says that it's starting to suck less, but I'm not sure I'll believe that. I know for certain I'll never buy a car with a Microsoft-designed user interface.
Because sometimes the world is a complicated place, and requires nuanced answers to simple questions.
Would that our politicians would learn this.
I just figured it out.
It was me that was confused.
Have a nice day.