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Comment Re:Ghost in the machine (Score 5, Informative) 128

Depends on the implementation. BMW, for instance, uses a planetary gear set connected to the steering wheel, the rack and an electric motor. If the motor or the adaptive steering logic fails, the motor is locked and you get an ordinary constant-ratio steering system.
Checking whether the steering output matches the input would take care of your scenario.

Comment Re:Windows (Score 1) 611

Windows Explorer has lost the Favorites menu. Also, new Explorer windows open, then scroll the navigation pane so that the Favorites list is out of view, making Favorites monumentally annoying to use.
The scroll-the-navigation-pane nonsense also means that when you open a new Explorer window, you have to wait for the navigation pane to finish expanding before you can start selecting what you need; in my case, invariably either a Favorites item or a network drive, both of which have been scrolled out of sight thanks to the expansion of the useless {username} folder hierarchy.

Comment Re:Killowatts are power, not energy (Score 5, Informative) 262

As others have said, Bloodhound already uses airbrakes for higher speeds. The disk brakes are used when the airbrakes become ineffective at lower speeds.
NASCAR is 200 mph, not 300 (and 1/4 the weight). And NASCAR brakes don't have to survive rotating at 1600 km/h. At that speed, the centrifugal force is more than most materials can handle. Bloodhound's wheels are some of the biggest engineering challenges in the project, they have to withstand something like 50,000 G. The brakes are a bit easier because they're smaller, but still a major problem.

Comment Re:Killowatts are power, not energy (Score 1) 262

Brakes on ordinary cars are typically several times more powerful than the car's engine, so we're talking about several hundred kW of available braking power for an ordinary saloon. On one hand, Bloodhound is a 6-ton machine going 250 km/h when the brakes are applied which would suggest the figure needs to be higher than that. On the other hand, it'll have far less grip than rubber tires on tarmac can generate so it's not the maximum power dissipation that counts.

Comment Bad engineering (Score 1) 216

The thermostat runs the heater based exclusively on the outside temperature. This is laughably called "weather controlled heating". The basic idea is that the building loses heat to the environment based on the temperature difference. So if you know the outside temperature and the rate of heat loss, you should be able to get a constant temperature inside, no?
Of course there are big problems with this:
- The placement of the temperature sensor (yes, just one) is critical. If it's in the shade, it'll miss the effects of insolation.
- It assumes the building is homogenous when in fact, the sun-facing side is always too hot and the shaded sides are too cold.
- Fine control depends on thermostatic taps on each radiator, but thanks to being right on top of the heat source, these generally don't work.
- The heating curve programmed into the thermostat must match the actual characteristics of the building, but no HVAC installer I know ever calculates this. Instead the curve has to be adjusted by trial and error. I know at least one installation where the interior temp is often off by +5 C despite multiple attempts at adjusting the curve.
All of this idiocy could be prevented by placing a temperature sensor inside the building. Even a single one located at the thermostat control panel would work. But no, that would be too simple.

Comment How? (Score 1) 152

It'd be interesting to see how they plan to do this. The main obstacle to mass production using CFRP (or any fiber-reinforced plastics) is that it takes much longer to put fibers in a mould, impregnate them and have the mixture dry to the point where it can be removed from the mould, than it would to stamp a sheet of aluminium into shape.

Comment How old are the tapes? (Score 2) 201

I tried something similar with some audio cassettes a few years ago, and found that I was too late: the tape had begun to stick together, and required more power than my high-end Denon tape deck could muster to play back. Rewinding didn't work either, as there's a tape tension sensor that shuts down the motor if it gets overloaded.

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