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Tesla Semi

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Re: Tesla Semi

#561

Earlier quoted context omitted.

when a semi tire goes... ... it's usually because the company was too cheap to buy anything but retreads.

Retreads don't fail appreciably more often than new tires. Being in the boring part of the bathtub curve makes up for their age. DOT HS 811 060 is the study you should Google.

So any given tire carcass I'm likely to see on the road -- hopefully in time to dodge it -- is just as likely to be from a new tire as from a retread?

Sorry, not buying it.

Re: Tesla Semi

#562

Earlier quoted context omitted.

It's way beyond that. 1. it makes changing a tire more complicated, and time is money, the longer it takes to change a blown tire the higher the penalties 2. when a semi tire goes, it goes hard , as GP noted with this arrangement the cowling will probably shatter, requiring a replacement (not just a replacement tire) and the pieces taking out other tire. If the cowling does not break, it will funnel bits of tire stra…

If a truck tire blows, it sometimes hits nearby cars and causes accidents, or just hits a motorcycle driver, cyclist or pedestrian and causes an instant death. These covers could be useful, if they were made for containment. Requires something like kevlar that can stretch and absorb the impact.

From what I've seen tires don't really blow as in pieces everywhere but tear then slap around, retreads when they blow tend to remove all the tread which is why you see half a tread on the side of the road sometimes. Containment isn't really too much of an issue IMO. Even thick (3/8) aluminum fenders get destroyed.

Re: Tesla Semi

#563
post #488

Earlier quoted context omitted.

It looks like the first big buyer is using them for those short-haul trips. Does the Semi have a sleeper cab? If not, it won't be used on long-haul routes regardless of battery.

What's required for a sleeper cab? We got some shots of the interior and it looked easily big enough to add a bed or the like. With a battery that big heating overnight should be practically free.

Just the space to put a bed, storage, and possibly a small fridge and microwave.

Re: Tesla Semi

#564

Earlier quoted context omitted.

No, but you can improve the range by a few percent.

until you consider the weight of the solar panel

Going with a weight of 20 lbs/m^2, that's only 600 lbs - less than 1% of the fully-loaded weight.

It's fairly likely one could get well below that mass using some of the more experimental solar panel designs (such as those in use for solar aircraft), but it would probably not be cost-efficient .

Re: Tesla Semi

#565

Earlier quoted context omitted.

There’s a lot of surface area on top of a trailer, just saying.

30 square meters, laying flat. So maybe 3kW. While the engines need more like 100kW. You can't effectively power any vehicle with 15% efficient solar panels.

One note, your second claim is not entirely true - while land vehicles are a ways from being feasible to power with photovoltaics (although I would have to do the math for trains, which may be close), we already have primarily [1] and exclusively [2] solar-powered aircraft.

[1] https://en.wikipedia.org/wiki/Solar_Impulse#Solar_Impulse_2_...

[2] https://en.wikipedia.org/wiki/Helios_Prototype

Re: Tesla Semi

#566

Earlier quoted context omitted.

Pretty sure Model 3 production is going amazingly well, yeah. Astoundingly well. But the media's portrayal of it has people convinced otherwise. Let's try this perspective instead: "Decade-old electric car company moves up plan for mass production of new affordable long-range sedan by 2 years" And then ask ourselves, after moving it up by 2 years, does a 3-month delay mean "things are going badly"? If I say I'm going…

I'd say someone who buys robots and operates them manually by men and claims "air resistance" is the biggest challenge in robotics because they should move so fast you can't see them, looks to me as not very sophisticated. But I don't operate robots.

He wasn't saying that air resistance is currently a problem. The current problem is that the robots don't move fast enough for air resistance to be a problem. He's basically pushing the question 'Going faster is obviously good. What happens if we go really really fast?'

Re: Tesla Semi

#567
post #214

Earlier quoted context omitted.

"Well, it's a fraction of the cost to operate, but if a tire blows, the mechanic will have to detach a piece of plastic. So I think we'll pass."

It's way beyond that. 1. it makes changing a tire more complicated, and time is money, the longer it takes to change a blown tire the higher the penalties 2. when a semi tire goes, it goes hard , as GP noted with this arrangement the cowling will probably shatter, requiring a replacement (not just a replacement tire) and the pieces taking out other tire. If the cowling does not break, it will funnel bits of tire stra…

I would think mechanics are going to become fewer and fewer as less mechanical bits exist on the electric vehicles. Tires, alignment, electrical. Those will be you're bread+butter services.

Re: Tesla Semi

#568

Earlier quoted context omitted.

It's this kind of ridiculous bootlicking that makes me dislike the Musk cult with a passion.

Bow before your your betters, prole. Also, be sure to protest Thanksgiving and Columbus Day as racist by working - nothing says antiestablishment like free labor.

If it is sarcasm I don't understand it.

Re: Tesla Semi

#569
post #383

I've been making the point that fuel duty and car taxes (if your country has them) need to be removed and road pricing brought in. Price per litre of diesel in the USA is about $0.75 vs $1.64 in the UK. Given that Tesla stated that the truck would pay for itself within 2 years ($200,000 in diesel savings), we're talking 11 months in the UK. The implication is that eHGVs will radically reduce the tax revenue of countr…

>Dynamic road pricing, based not only on time of day, but also vehicle type, is probably the only way forward. Wouldn't want to let poor people with inflexible work hours go un-screwed... /s I don't know why everyone sees reduced tax revenue as a problems. Less money to spend means more critical evaluation of how it gets spent.

Like what happened after every American "big tax cut". Reduction in income instantly exposed massive waste in government, and the tax cuts were found to be deficit-neutral! /s

Re: Tesla Semi

#570

Earlier quoted context omitted.

So if Tesla has trucks, and is developing self-driving capability, and the trucking industry is a mishmash of legacy systems, what pieces does Musk need to just go into the trucking business direct?

This is a huge question. It depends on so many things. We can make assumptions on viable strategies given Tesla's finances and past behavior. But that still leaves us with a lot of solution space. First you have to accept that the trucking industry is conservative. The mom and pop distributors, the big guys, everyone. The people who own, lease and operate the trucks. There are all sorts of legislative hurdles to deal…

I was thinking more along the lines of Musk setting up a trucking company with a fleet consisting of autonomous Tesla trucks. Obviously not something that can be done right now, but given the push towards self-driving vehicles, and things like Amazon's delivery drones, I'm wondering if the current trucking industry is really Tesla's target market in the long term.
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