Missing The PointTesla announces that only Tesla Blue subscribers will have access to brakes.
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Old Man Mike
Nafnlaus 🇮🇸 🇺🇦@oldmanmike @MissingThePt Pedal misapplication. Common in all models of cars, and always has been. The panicked person who thinks the accelerator is the brake just keeps pressing on it as hard as they can in their panic, hoping to "override the accelerator" and slow the car down.
There's airplane equivalents of this, too, where pilots end up crashing their planes
@nafnlaus sorry but no fucking way
@oldmanmike Sorry but yes. Google it. Widely recognized by the NHTSA for decades. Investigated for many cars (including Teslas), many, many times over.
More to the point, in the hi-res videos, you can literally see that the brake lights aren't on. And the acceleration starts right when they would have needed to press the brake (for the motorcycle).
There is a PHYSICAL LINKAGE from the brake pedal to the brakes. And the brakes are more powerful than the motors. They were NOT braking.
The Long Tail@nafnlaus @oldmanmike statement recanted
@sleepyfox @oldmanmike *Virtually every* modern car has brakes powerful enough to override the full application of the throttle pedal, *and* throttle overrides on top of that.
Tell me, how fast can your car do 0-60?
Now tell me, how fast can it do 60-0?
The latter will be faster.
And that's just the start of that. Brakes could decelerate the car a lot faster than that still if *they* were the limiting factor; in reality, the tyres are.
@nafnlaus @oldmanmike That logic is flawed, but it turns out you are right. Evidence here: https://web.archive.org/web/20190829112256/https://www.motortrend.com/news/unintended-acceleration-test/
What I remembered was footage shot from a helicopter of a prius with smoke billowing from the applied brakes, on fire, as the car raced down the freeway.
I can only guess either the pedal was not fully applied leading to the brake fluid boiling before the car could be stopped, or a problem with the brakes.
The Unintended Acceleration Test - Motor Trend - MotorTrend
"They died in Toyotas, leaving many questions." The headline on the front page of Monday's edition of USA Today, topped by a Toyota logo, wrapped in black, and featuring photographs of six people killed in what were claimed unintended acceleration incidents, was nothing if not sensationalist. Read along as the experts at Motor Trend test whether modern braking systems are powerful enough to stop cars suffering from unintended acceleration.
@sleepyfox @oldmanmike "That logic is flawed"
"f=ma" says otherwise.
@nafnlaus @oldmanmike engines need to create more power because of air resistance, which increases with the square of velocity.
Plus it's not momentum that is important, but kinetic energy, which needs to be converted to heat by the brakes to stop the car.
But like I said, arguing armchair physics is irrelevant in the face of experimental evidence.
Plus it's not momentum that is important, but kinetic energy, which needs to be converted to heat by the brakes to stop the car.
But like I said, arguing armchair physics is irrelevant in the face of experimental evidence.
@sleepyfox @oldmanmike Air resistance is utterly irrelevant compared to the force of either the brakes or the engine/motor. If you don't believe me, shift into neutral and see how long it takes to coast down, then try slamming on the brakes and compare.
f = 1/2 ρv²CDA.
ρ = 1,29kg/m3
v = 30m/s
Cd (Model 3) = 0.21
A (Model 3) = ~2,3m²
f = 280,4N
f = ma
280,4 = 1730 * a
a = 0,1621 m/s² = 0,01652 g
Do you think your brakes only apply negative-one-sixthieth of a G?
@sleepyfox @oldmanmike (Shifting into neutral and coasting down actually *overplays* the amount of force from air resistance, since you also have rolling drag and free-spinning powertrain losses, which together are like 25-50% of your highway-speed losses, depending on your velocity and a lot of other factors)