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Comment: Re:This helmet scares me. (Score 2) 126

by MasterOfGoingFaster (#47666833) Attached to: Android Motorcycle Helmet/HUD Gains Funding

You really should learn a bit about polycarbonate - better known as Lexan (that's the Sabic trademark for PC). It's extremely durable, very shatter resistant, highly UV resistant,

Yes, I should. I've only used it since the mid 1980's - back when it was "GE Lexan". ;D But I won't claim to be an expert in PC.

Help me understand. You say "highly RV resistant", but the Wikipedia article you reference says RV resistance is "fair".

And from here: http://en.wikipedia.org/wiki/C...
"Crazing occurs mostly in amorphous, brittle polymers like polystyrene (PS), acrylic (PMMA), and polycarbonate; it is typified by a whitening of the crazed region."

So I will admit to a lack of expertise with PC, but what I've cited agrees with my own experience. I'd certainly appreciate more data, if this is your field.

Comment: Re:This helmet scares me. (Score 1) 126

by MasterOfGoingFaster (#47666723) Attached to: Android Motorcycle Helmet/HUD Gains Funding

". PC tends to craze (small cracks) when exposed to UV."

^This^ you have wrong.

While I won't argue that PC is the best material, that 'craze' comment is ... crazy.

I'm open to the idea that I'm wrong, but you've not done anything to support your assertion. I'm also open to the idea that you are a troll. Let's seek a third opinion on the subject.

From http://en.wikipedia.org/wiki/C...

"Crazing occurs mostly in amorphous, brittle polymers like polystyrene (PS), acrylic (PMMA), and polycarbonate; it is typified by a whitening of the crazed region."

I could still be wrong, but there does seem to be some evidence that I may be right.

Comment: This helmet scares me. (Score 5, Insightful) 126

by MasterOfGoingFaster (#47663539) Attached to: Android Motorcycle Helmet/HUD Gains Funding

I'm a motorcycle rider and racer for over 40 year. This helmet scares me.

First, this little detail: "The “highly weather resistant” helmet is made of a “lightweight, aerodynamic” polycarbonate shell, says Skully Systems."

Polycarbonate - OK, that's the material used in low-end helmets (sub $200). In the $300+ category, we have fiberglass and carbon fiber. PC tends to craze (small cracks) when exposed to UV. I've seen a PC helmet crack in half when it fell off the bike and hit the concrete. Just from the material, I'm not interested.

Second - When I watched the video, I found the lower right display too distracting. Riding a bike in traffic, you never know when some idot will run a stop sign, or pull out in traffic. You need to be able to pick up any movement as you scan for threats. This adds distraction. Distraction on a motorcycle kills. Kills you dead.

Third - Did you see how most of the testimonials come from non-riders? There was a "tire expert" (WTF is that?) and only one racer/builder. So I think this is a bunch of tech guys putting together a somewhat-cheap helmet, as a way to sell cool tech.

Over time, this may (should?) evolve into something that works well. But I fear this will turn into the motorcycle-equivalent of the texting-while-driving problem.

Comment: Portable checkout terminal (Score 2) 60

by MasterOfGoingFaster (#46878075) Attached to: Why Does Amazon Want To Sell Its Own Smartphone, Anyway

I suspect Amazon sees the smartphone as a portable checkout terminal. Rather than leave it open to any competitors, they want to own the OS and get a peek at what you're looking for. It's also a consumption device, and is the hook to selling movies, books, etc. It may be the case that they really don't want to be in the smartphone business, but fear what a competitor might do.

Comment: Re:Actually, Audi blamed the driver (Score 1) 394

by MasterOfGoingFaster (#46580099) Attached to: Is the Tesla Model S Pedal Placement A Safety Hazard?

I never had the cruise control malfunction again, but I could repeat the brake issue. Yes, these are two separate issues. But the brake issue prevents the driver from being able to stop the car.

When the car took off (I was on an almost-empty Interstate highway in Texas), I tried to brake and couldn't move the pedal. I put both feet on it and pushed as hard as I could. In the gym, I could push 600 lbs on the leg press. I could feel the pedal arm flexing under the pressure, but it would not move downward. I regained control of the throttle when I shut off the cruise control - leading me to believe the cruise control is at fault.

I demonstrated the brake problem to the dealer. They replaced the master cylinder assembly. As I drove away, someone pulled out in front of me and I could not stop for several seconds. Once again, the turbo was generating positive manifold pressure and the brakes would not move. After the manifold pressure went negative, I regained brakes. I took it back to the dealer. An older mechanic took a look and he said the check valve was worn. Once replaced, the problem vanished.

Summary:
Event 1 - runaway acceleration and zero brake
Event 2 - zero brake on boost
Event 3 - zero brake on boost.

BTW - I have raced motorcycles and cars for years, so I was quite comfortable with the car going fast. Being alone on a sunny day with no curves in sight gave me plenty of time to ponder the cause. I knew I could turn the engine off, so I wasn't in much danger. I was able to evaluate all the suspected causes. Feet on the wrong pedal? Nope. Floor mat or stuck linkage? Nope - it was easy to move and quite loose. The only other thing connected to the throttle butterfly was the cruise control. That's when I tapped the brakes - and discovered it wouldn't move. That's when I realized I was dealing with two faults. Glad I had a dashboard switch to shut down the CC. I was pressing the brakes, and suddenly it started to give slightly. I noticed turbo boost had just gone negative. I hit the gas, built up pressure, and sure enough the brakes wouldn't budge. So that part was very repeatable.

Comment: Re:Actually, Audi blamed the driver (Score 1) 394

by MasterOfGoingFaster (#46579703) Attached to: Is the Tesla Model S Pedal Placement A Safety Hazard?

Nearly all the Audi issues were old people hitting the wrong pedal while parking.

And how do you know that? That was the theory Audi suggested - blame the drivers.

Your issue was unrelated to the focus of the issue at the time.

Not at all. I owned the car. I saw the 60 minutes report. People claimed the car "suddenly took off" and "could not budge the brake pedal". This was the exact behaviour that my car exhibited.

Audi claimed (as did others) that they must have hit the gas pedal, and thought it was the brake. That is quite logical. And I'm sure that happened in some cases. But I also know my car did exactly what 60 Minutes claimed.

Comment: Re:Actually, Audi blamed the driver (Score 1) 394

by MasterOfGoingFaster (#46579635) Attached to: Is the Tesla Model S Pedal Placement A Safety Hazard?

Interesting that you'd believe a government agency, rather than someone who actually owned the car, had the experience, and analyzed it. You link, however, was crap. He writes:

"When I first heard about the Audi “sudden unintended acceleration” segment on CBS’s 60 Minutes in 1986, I knew instantly that they were blowing smoke. Literally."

So he made up his mind instantly. Well, he's wrong. When my Audi 5000T was on positive pressure (turbo boost), high pressure would leak past the check valve, preventing the brakes from being applied. His statement that the brakes would override the engine does not take that into account.

Comment: Actually, Audi blamed the driver (Score 3, Interesting) 394

by MasterOfGoingFaster (#46569029) Attached to: Is the Tesla Model S Pedal Placement A Safety Hazard?

Audi got partial blame for their unintended acceleration problems because the brake and throttle were close enough that when it was fully depressed, the driver would have trouble telling from position which pedal was depressed.

That was Audi's excuse - but not the actual reason.

I was driving on an interstate highway on cruise control in an Audi 5000 Turbo, when the car suddenly went to full throttle. I could easily move the gas pedal up and down, so it wasn't stuck. I shut off the cruise control via a dashboard switch, and regained control. The throttle issue was clearly the cruise control malfunction. It never did it again. I could not duplicate the fault, so I suspect poor RF shielding (trucker using a hopped up CB radio?).

Yeah - I contacted Audi with the "good news" and they had zero interest. They would rather blame the customer than recall the cars.

Comment: Re:Audi - Mine took off on its own (Score 4, Insightful) 394

by MasterOfGoingFaster (#46568923) Attached to: Is the Tesla Model S Pedal Placement A Safety Hazard?

Is this the same bullshit that almost made Audi pull out of the US? It looks like it.

The bullshit was Audi blaming the customers for confusing the pedals. The fault was elsewhere. I know - I owned an Audi 5000T that did this.

I was driving on an interstate highway on cruise control - my feet were not touching the pedals. The car suddenly went to full throttle. I could move the throttle pedal up and down with my foot. The brake pedal would not budge. I shut off the cruise control via a dashboard switch, and regained control. After the turbo boost dropped below atmospheric pressure, I regained brakes. I later discovered the check valve on the vacuum assist was worn, causing the loss of brakes when the turbo was on boost. The throttle issue was clearly the cruise control malfunction. It never did it again. I could not duplicate the fault, so I suspect poor RF shielding (trucker using a hopped up CB radio?).

I contacted Audi, and they blew me off.

To their credit, they stopped using the check valve method, so someone at Audi understood the fault condition. I'm less sure about the other issue. I solved the problem by deciding never to buy another Audi.

"Silent gratitude isn't very much use to anyone." -- G. B. Stearn

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