Beta
×

Welcome to the Slashdot Beta site -- learn more here. Use the link in the footer or click here to return to the Classic version of Slashdot.

Thank you!

Before you choose to head back to the Classic look of the site, we'd appreciate it if you share your thoughts on the Beta; your feedback is what drives our ongoing development.

Beta is different and we value you taking the time to try it out. Please take a look at the changes we've made in Beta and  learn more about it. Thanks for reading, and for making the site better!

Comments

top

Tesla Announces Dual Motors, 'Autopilot' For the Model S

samwichse Re:Performance (283 comments)

6g cornering? I know that's not right...

http://www.formula1.com/inside...
"A modern Formula One car is capable of developing 3.5 g lateral cornering force (three and a half times its own weight) thanks to aerodynamic downforce."

about two weeks ago
top

Former Infosys Recruiter Says He Was Told Not To Hire US Workers

samwichse Re:Well duh. (293 comments)

My office hosts a lot of visiting international workers. Mostly from China.

It's pretty clear after working with them for a while and listening to them talk that American = white to them.

It's very weird, because my cube-mate (right across from me) is black. They would say to us both... inappropriate things like: "Americans have such pale skin" and we would both just kind of look at each other in bafflement as to what to say to that.

Sam

about two weeks ago
top

Send Your Own Radiosonde 90,000 Feet Into the Sky (Video)

samwichse Re:Ion Thruster (48 comments)

JP Aerospace thought enough of the idea to study it and run computer simulations:
http://www.today.com/id/502538...

About 2/3 down the page under the heading "Getting to Orbit"

""What if you flatten it out and give it a little bit of aerodynamic shape, and point it up a little bit so you have some of that thrust turned into lift?" Powell asked. "As you climb up, your drag is dropping, and now you're accelerating. The question comes, can you get aerodynamically clean enough, while still supporting the lift enough to slowly get faster and faster ... to get all the way to orbit? Is there a drag-power combination to do that? We think there is. It looks like there's a wide margin.""

"To achieve orbital flight, the craft would require a spaceworthy propulsion system — something more substantial than helium and propellers. Powell would turn to the type of continuous-thrust ion propulsion system used on NASA's Deep Space 1 and the European Space Agency's SMART 1 moon probe. Based on computer simulations with different configurations, he contends that such engines could drive the mega-balloon to orbit in three to nine days."

about two weeks ago
top

Fuel Efficiency Numbers Overstate MPG More For Cars With Small Engines

samwichse Re:MPG estimates based on driving like an idiot? (403 comments)

No, they're claiming that the UK test cycle is overly optimistic (which is very true!), the article with the original data is here, and contains a similar chart for the EPA cycle. Spoiler: it's dead-on accurate, most people do indeed drive like idiot jackrabbits:

http://emissionsanalytics.com/beware-the-danger-of-downsizing/

USA
Eng(L) Var    Real MPG
1-2    2%     34.0
2-3    -1%    28.2
3-4    0%     21.5
4-5    3%     20.1
5-6    -3%    17.5
6+     1%     16.9
Avg    0%     23.0

about two weeks ago
top

Fuel Efficiency Numbers Overstate MPG More For Cars With Small Engines

samwichse Re:Why are EPA estimates inaccurate? (403 comments)

The EPA tests aren't inaccurate though. The original article (not the one Slashdot linked) has more data, including a comparison with the same test cycle data but using the EPA cycle vs real world MPG. Spoiler: it's almost dead on accurate:

USA
Eng(L) Var    Real MPG
1-2    2%     34.0
2-3    -1%    28.2
3-4    0%     21.5
4-5    3%     20.1
5-6    -3%    17.5
6+     1%     16.9
Avg    0%     23.0

Source:
http://emissionsanalytics.com/beware-the-danger-of-downsizing/

about two weeks ago
top

Fuel Efficiency Numbers Overstate MPG More For Cars With Small Engines

samwichse Re:Original link has more data (403 comments)

And, the EPA test cycle is far more accurate than the UK one:

USA
Eng(L) Var    Real MPG
1-2    2%     34.0
2-3    -1%    28.2
3-4    0%     21.5
4-5    3%     20.1
5-6    -3%    17.5
6+     1%     16.9
Avg    0%     23.0

about two weeks ago
top

Fuel Efficiency Numbers Overstate MPG More For Cars With Small Engines

samwichse Re:Its the TEST! (403 comments)

If you look at the original article, not the one slashdot linked, you'd find a comparison to the EPA test cycle numbers at the bottom. The EPA test cycle appears to be about as spot on as I would ever hope for:

USA
Eng(L) Var    Real MPG
1-2    2%     34.0
2-3    -1%    28.2
3-4    0%     21.5
4-5    3%     20.1
5-6    -3%    17.5
6+     1%     16.9
Avg    0%     23.0

about two weeks ago
top

The Odd Effects of Being Struck By Lightning

samwichse Re:Not guaranteed memory problems (191 comments)

Indeed, people installing aftermarket battery sticks in Honda IMA hybrids learned the hard way: each stick of 6 D-cells slides through a pair of rubber matrices supporting the 20 sticks. Aftermarket installers were first just throwing the bare sticks into the matrices, and the batteries after a time would sometimes smoke and catch fire.

Turns out the plastic shrink wrap on the outside of each cell became important to insulate the batteries from the carbon black in the rubber at the 180V the system could hit. It looked like window dressing, but wasn't. Fun times. I bet lightning (at WAY higher voltage than 180) would go through rubber like it was steel.

about three weeks ago
top

IBM Solar Concentrator Can Produce12kW/day, Clean Water, and AC

samwichse Re:Found the IBM link. (268 comments)

It's not a 40m diameter dish, it's a 40m^2 dish.

about a month ago
top

IBM Solar Concentrator Can Produce12kW/day, Clean Water, and AC

samwichse Re:Cubic litres (268 comments)

Suitable for plumbing your castle in Minecraft though.

about a month ago
top

Irish Girls Win Google Science Fair With Astonishing Crop Yield Breakthrough

samwichse Re:Terrific counter to Monsanto's herbicide messag (308 comments)

Yes, so wrong you say. Knee! Jerk!

"Professor Jane Mt. Pleasant of Cornell University studied the polyculture of corn, pole beans, and squash. She found that these plots grown in the traditional Iroquois way yielded about 25-40 bushels of corn per acre. This compares poorly to the 100-bushels per acre average for modern New York State famers. Then she added the value of the beans and squash from the same plots. The total yield of the three sisters system was 4.02 million calories per acre compared to the 3.44 million calories per acre."

We plant crops the way we do to make them labor unintensive to harvest. If you knew anything about ecology you would grasp that a monoculture is pretty much never going to take full advantage of a site like polyculture.

about a month ago
top

Phablet Reviews: Before and After the iPhone 6

samwichse Re:what?!?! (277 comments)

This may be the most painful whoosh I've ever seen on Slashdot.

about a month ago
top

Is the Tesla Model 3 Actually Going To Cost $50,000?

samwichse Re:More importantly (393 comments)

A Prius with a bad traction battery is going NOWHERE. The car doesn't move unless there's a good battery in it.

Honda IMA cars can go if the batteries are worn out though (and have to often :( ).

about a month ago

Submissions

samwichse hasn't submitted any stories.

Journals

samwichse has no journal entries.

Slashdot Login

Need an Account?

Forgot your password?