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Comments

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SpaceShipTwo Flies Again

wagnerrp Re:Oh so close... (22 comments)

The difference between something able to reach 100km, and something able to reach that altitude with enough energy to make it a quarter of the way around the world, is significant. They are really not close at all to being a useful transportation mechanism.

2 days ago
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SpaceX Falcon 9 Rocket Blasts Off From Florida

wagnerrp Re:So was the landing successful? (112 comments)

Especially when you have a hot bell and combustion chamber that suddenly come into contact with salt water.

about three weeks ago
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Scotland Could Become Home To Britain's First Spaceport

wagnerrp Re:Hey smart guys (151 comments)

Does Virgin Galactic even have plans for a vehicle capable of LEO insertion? All that SpaceShipOne/Two nonsense barely even qualifies as reaching space, and achieves about a 50th the energy necessary for actual orbit.

about three weeks ago
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Chinese Couple Sells Children To Support Online Game Addiction

wagnerrp Re:Silly season much (131 comments)

Officer Zau kicks over the wood stove, lifts open a patch of the tile floor and shines his light into the darkness below.

Officer Zau unholsters her Type 15 pistol, takes aim at Han and puts her finger on the trigger.

I think there's something more interesting going on here than simple population control...

about three weeks ago
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A Skeptical View of Israel's Iron Dome Rocket Defense System

wagnerrp Re:Subject bait (379 comments)

Stay on topic and discuss the technical aspects of the missile system, at least that is what should be discussed here.

The article itself hardly touches on the technical merits of the missile system. It mentions how there are hardly any public releases of technical aspect to discuss, and that the handful of images of the system in operation show intercept angles that are highly unlikely to be successful. The core argument of the article is that the whole situation is nothing more than a PR campaign on both sides.

Hamas fires inaccurate artillery rockets, unlikely to actually hit anything, at Israel, under the hopes Israel counter-attacks and causes lots of collateral damage that looks bad to international press.

Israel produces a defense system and makes precision counter-attacks to prove their technological and military prowess, and restraint in its use, to international press.

about three weeks ago
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Ode To Sound Blaster: Are Discrete Audio Cards Still Worth the Investment?

wagnerrp Re:No. (502 comments)

It looked like the SB card performed well within the 20-20K range, and unless you're looking to do further processing on the analog output from the card, anything more than that is unnecessary.

about three weeks ago
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Radical Dual Tilting Blade Helicopter Design Targets Speeds of Over 270mph

wagnerrp Re:Dual or quadricopters (103 comments)

Because they don't scale up.

http://en.wikipedia.org/wiki/Square-cube_law

Smaller rotors means lower mass flow rate, requiring higher flow velocity to produce the necessary thrust. Higher flow velocity means higher power requirements. The larger your aircraft, the more difficult it becomes to produce the necessary amount of power to remain airborne.

about three weeks ago
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Radical Dual Tilting Blade Helicopter Design Targets Speeds of Over 270mph

wagnerrp Re:not that surprising. (103 comments)

More importantly, a pair of counter-rotating rotors gets around the pesky roll issue caused by rotor stall on the retreating side at high speed. The rotor may still stall, but it doesn't matter nearly as much since you're still balanced.

about three weeks ago
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ESA Shows Off Quadcopter Landing Concept For Mars Rovers

wagnerrp Re:Those rotor blades have no air to move! (104 comments)

You're going the complete wrong direction. If you want to have any change in hell of actually having enough power to get this thing in the air, you need to get your blade loading down, and that means a huge rotor. Huge rotors mean you need to be running low RPMs to keep it subsonic at the tip, and remember that the colder and higher molecular weight atmosphere means the speed of sound is going to be ~30% lower.

about three weeks ago
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ESA Shows Off Quadcopter Landing Concept For Mars Rovers

wagnerrp Re:Why a separate rover? (104 comments)

The quadrotor design paradigm exists because small electric motors are cheap, and the power-to-weight ratios available in the couple pound range are absurd to the point that good engineering is unnecessary. In the couple thousand pound range, power becomes far more scarce, and the small, inefficient rotors just won't cut it. They have lowered the minimum barrier to entry for hobbyists, and research projects that need a simple airborne platform. They don't work well for full scale aircraft.

about three weeks ago
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TSA Prohibits Taking Discharged Electronic Devices Onto Planes

wagnerrp Re: Incoming international flights (702 comments)

once your cell voltage drops below a certain critical value, a protection circuit disconnects it from the rest of the pack.

Makes it hard to charge it, eh?

Yes. It does. That's why a Li-Ion battery is permanently dead if you allow it to self-discharge too far.

about three weeks ago
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TSA Prohibits Taking Discharged Electronic Devices Onto Planes

wagnerrp Re: Incoming international flights (702 comments)

Since you don't seem to be getting bored of yourself, it's the fundamental principle of thermionic emission.

Hey what is the terminal voltage of a discharged Liion battery? Of a LiPO?

Zero. In a multi-cell Li-Ion battery, once your cell voltage drops below a certain critical value, a protection circuit disconnects it from the rest of the pack. A fully discharged battery will simply be a short circuit bypassing all the individual cells.

about three weeks ago
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Airbus Patents Windowless Cockpit That Would Increase Pilots' Field of View

wagnerrp Re: Failsafe? (468 comments)

Catastrophic failures can happen. There's no way to predict all eventualities, and trying to do so will bankrupt you. All you can do is provide enough redundancy to bring your statistical failure rate to an acceptable level.

Flight 232 was simply a poor design. The three hydraulic systems all had lines that ran right next to each other, and had no shut off valves. When the tail engine had an uncontained failure, it severed lines on all three systems, which then depressurized throughout the aircraft.

about three weeks ago
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TSA Prohibits Taking Discharged Electronic Devices Onto Planes

wagnerrp Re: Incoming international flights (702 comments)

It's not about dead batteries, its about hollowed out electronic cases filled with explosives.

The previous poster was referring to dead batteries.

Uncharged/out of service Li-ion batteries are subject to more problems at altitude than properly charged ones.

about three weeks ago
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New Zealand ISP's Anti-Geoblocking Service Makes Waves

wagnerrp Re:Great! (153 comments)

You can still perform NAT over IPv6, or set up a more intelligent proxy if your data stream carries information that could unmask the remote endpoint. There will be no difference.

about three weeks ago
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TSA Prohibits Taking Discharged Electronic Devices Onto Planes

wagnerrp Re: Incoming international flights (702 comments)

That doesn't make any sense. A dead Li-Ion battery has little remaining energy, and that which does exist can't go anywhere because the built-in safety mechanisms would have burned out all the internal fuses.

about three weeks ago
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New Single Board Computer Lets You Swap Out the CPU and Memory

wagnerrp Re: Just think of what you can do with this! (122 comments)

And I'm sure it communicates with a number of microcontrollers to perform the real-time IO, rather than crippling the CPU with those tasks, and doesn't carry a giant completely unused GPU around with it that uses far more power than the CPU.

about a month ago
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Rightscorp Pushing ISPs To Disconnect Repeat Infringers

wagnerrp Re: Awesome plan (92 comments)

You cannot download unless someone else is uploading. Since uploading is copyright infringement, and thus illegal, you are party to the illegal action. Your argument is like claiming it's not illegal to buy bootleg goods.

about a month ago
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Austrian Tor Exit Node Operator Found Guilty As an Accomplice

wagnerrp Re:It'll come down to an opinion (255 comments)

It'll come down to an opinion as to whether or not the use of Tor implies an intent to allow others to break the law. While an anonymizer service itself can be used for both legal and illegal purposes

I was under the impression TOR was explicitly designed to allow others to break the law, for the benefit of regions where things like expressing an opinion is illegal. Of course an anonymizer service is only effective if there is plenty of other innocuous white noise on the same channel.

about a month ago
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Fox Moves To Use Aereo Ruling Against Dish Streaming Service

wagnerrp Re:Big Difference (210 comments)

The users' own Hopper DVR is recording the television, transcoding it, and streaming it across the users' own internet connection to the users' own devices. This is not a service Dish is offering, merely a capability of the physical DVR they are renting to subscribers.

about a month ago

Submissions

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MythTV 0.24 Released

wagnerrp wagnerrp writes  |  more than 3 years ago

wagnerrp (1305589) writes "Following with the accelerated development schedule, MythTV 0.24 is now available six months after the release of 0.23. MythTV is a distributed Linux-based PVR and home theater application. Highlights of this release include a brand new theme-able playback OSD, playback of HD audio formats, multichannel and 24/32-bit audio output, Bluray playback, and multi-angle DVD playback. A full listing of changes is available on the MythTV wiki."

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