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Comment: Re:It's worse than you think (Score 4, Insightful) 107

by hackertourist (#47741977) Attached to: Air Force Requests Info For Replacement Atlas 5 Engine


The Atlas V was designed at a time when the Soviet Union was crumbling. Using Russian engines was an American ploy to ensure world stability by keeping Russian rocket designers gainfully employed instead of leaving them fend for themselves, building God knows what for the highest bidder.

Did that work? Well, I haven't seen much progess in rocket technology by people crazy enough to start wars.

Has this tactic outlived its usefulness? Yes, in view of recent developments, it's time for a new arrangement. Oh, look, that's just what they're doing.

Comment: Re:Only 6 pairs? (Score 3, Informative) 135

They use optical amplifiers. The signal stays in optical form, and is guided through a special section of fiber. A laser pumps energy into that fiber section, some of that energy ends up amplifying the signal. So it still needs power to drive the laser.

Comment: Not much of an issue (Score 1) 275

by hackertourist (#47633047) Attached to: Long-Wave Radar Can Take the Stealth From Stealth Technology

Knowing an aircraft is present is one thing, being able to shoot it down is quite another matter. You can't use these low-frequency radars in fighter aircraft or missiles, because the antenna size would be too large. So you have to use a ground station to guide your fighters to an intercept point, and get close enough to use either IR missiles or get close enough for HF radar to work. But by then your non-stealthy fighter will be far inside the detection range of the F-35 and will have gotten a couple of missiles up its ass.

Comment: Re:I wonder how long it would've taken NASA? (Score 1) 49

by hackertourist (#47521093) Attached to: SpaceX Releases Video of Falcon Rocket's Splashdown

(28 engines? What is the current record holder?)

Off the top of my head, SpaceX already holds the record with 9 engines on a single stage. There have been stages with 8 engines (Saturn 1B?). The Soviets tried 30 engines on the N-1, but that failed 4 times in 4 attempts. There's been a Delta variant with 8 boosters clustered around the first stage. If you count engines with multiple nozzles, the number goes up (5x4 nozzles on the Soyuz, but that's only 5 engines).

+ - Enraged Verizon FiOS Customer Seemingly Demonstrates Netflix Throttling-> 1

Submitted by MojoKid
MojoKid (1002251) writes "The ongoing battle between Netflix and ISPs that can't seem to handle the streaming video service's traffic boiled over to an infuriating level for Colin Nederkoon, a startup CEO who resides in New York City. Rather than accept excuses and finger pointing from either side, Nederkoon did a little investigating into why he was receiving such slow Netflix streams on his Verizon FiOS connection, and what he discovered is that there appears to be a clear culprit. Nederkoon pays for Internet service that promises 75Mbps downstream and 35Mbps upstream through his FiOS connection. However, his Netflix video streams were limping along at just 375kbps (0.375mbps), equivalent to 0.5 percent of the speed he's paying for. On a hunch, he decided to connect to a VPN service, which in theory should actually make things slower since it's adding extra hops. Speeds didn't get slower, they got much faster. After connecting to VyprVPN, his Netflix connection suddenly jumped to 3000kbps, the fastest the streaming service allows and around 10 times faster than when connecting directly with Verizon. Verizon may have a different explanation as to why Nederkoon's Netflix streams suddenly sped up, but in the meantime, it would appear that throttling shenanigans are taking place. It seems that by using a VPN, Verizon simply doesn't know which packets to throttle, hence the gross disparity in speed."
Link to Original Source

Comment: I don't see the problem (Score 1) 106

by hackertourist (#47455671) Attached to: Seat Detects When You're Drowsy, Can Control Your Car

What do you mean, 'creepy'? This is a function that automatically switches on existing systems (adaptive cruise control, lanekeeping). As ever, any action you take manually will override this.
My grandfather died in a crash because he fell asleep (or fainted, we never found out definitively) at the wheel. Had this existed 50 years ago, I might have been able to meet him.

Comment: Re:That said... (Score 1) 60

by hackertourist (#47437955) Attached to: Sand-Based Anode Triples Lithium-Ion Battery Performance

Some EVs also let you limit the max that your pack charges up to to further extend lifespan (it's usually destructive both to use the very top end and the bottom end of the discharge range).

I wish I could get my laptop to do that. It spends most of its time in a dock anyway, endlessly cycling between 100% and 95% of capacity, eating up the limited number of charge cycles to no benefit.

Comment: I can see why (Score 1) 468

Cockpit windows in airliners are tiny. You have maybe 20 cm of clearance between the control panels below and above the cockpit windows, so you have a very limited field of view.

This Airbus proposal isn't the first windowless cockpit, by the way.
British Aerospace proposed the P.125 VTOL fighter which had the pilot sitting in a windowless cockpit buried in the fuselage.
And Charles Lindbergh had no front view on his Atlantic flight: he had to rely on a periscope and his side windows.

UNIX was half a billion (500000000) seconds old on Tue Nov 5 00:53:20 1985 GMT (measuring since the time(2) epoch). -- Andy Tannenbaum