Tesla Semi Finally Revealed

[freebeard]

Originally Posted by Redpoint5

They'll have to change the "book hours" on that procedure to 20hrs to make up for the lost hours on everything else.

All that 'hand labor' will hasten the arrival of magnetic bearings.

[NeilBlanchard]

Originally Posted by rmay635703

You mean 200kwhr

Or 0.2MWh

About twice as much capacity as a p100 but at 4x the price

Ooops - 200kWh.

[Xist]

Has anyone mentioned the 5-second 0 - 60? I am not sure how much that matters to anyone here, but other people seem very excited about that.

According to https://itstillruns.com/car-vs-tract...r-6579130.html, a semi without trailer can do 0 - 60 in 10 seconds, it takes 20 seconds with an empty trailer, and 35 seconds if fully-loaded.

Perhaps the Tesla could hit 60 with an empty trailer in 10 seconds and 17.5 with a full load, but would it?

People commented in this discussion that fast acceleration is irrelevant to trucking often prevented by the computer.

Still, wouldn't it be nice to be behind a semi that accelerates decently?

[jcp123]

Originally Posted by Xist

Has anyone mentioned the 5-second 0 - 60? I am not sure how much that matters to anyone here, but other people seem very excited about that.

According to https://itstillruns.com/car-vs-tract...r-6579130.html, a semi without trailer can do 0 - 60 in 10 seconds, it takes 20 seconds with an empty trailer, and 35 seconds if fully-loaded.

Perhaps the Tesla could hit 60 with an empty trailer in 10 seconds and 17.5 with a full load, but would it?

People commented in this discussion that fast acceleration is irrelevant to trucking often prevented by the computer.

Still, wouldn't it be nice to be behind a semi that accelerates decently?

As someone who drives a truck, actual acceleration is nearly meaningless to me. At best something of a side bonus. Much more valuable is how well it can climb with a load. That right there puts money in a driver's pocket when terrain is involved.

[RedDevil]

It is not just the acceleration power that is important here. The Tesla truck does not need to change gear, ever. That will save a lot of time in town and in undulating terrain.

I see trucks, stopped at a traffic light, miss the next green light all the time.
The 'green wave' is tuned for cars, not for slowly accelerating trucks.
A fast accelerating Tesla truck may save one minute per traffic junction...

[slowmover]

It’s not ever going to be an efficiency to accelerate a big truck stoplight to stoplight to aid traffic flow.

As above, it’s about a higher average mph. The time from taking on the load until delivery. Signature to signature.

Cutting the hills down to size would be the greatest aid to average mph past lower traffic volume. If greater acceleration is available, then it’s use on the highway is where it matters.

Operating a big truck is about being smooth. Missing “the green light wave” is consistent with this. It’s too much mass to contend with. Empty, I’d think I’d want a limited rate of acceleration control applied. Throttled back. There’s no good reason to do otherwise, as wear on tires, brakes etc isn’t justified, nor is hotdog driving.

Same for other vehicles. 0-60 in 12-seconds has always been fast enough for personal transportation.

Expect that sort of thing to happen. A “fuel efficiency standard” for electric vehicles.

.

[rmay635703]

As someone in the heavy truck industry we see fatigue failures in various components on older trucks all the time.

More acceleration means either more weight or more structural failures more often.

Assuming of coarse the truck isn’t built of some sort of super metal or composite.

[freebeard]

Assuming of coarse the truck isn’t built of some sort of super metal or composite.

Foamed metal

The parts will look beefier, but weigh less and be stronger.

[RedDevil]

I think fatigue failures are mainly due to lots of changes in load rather than the load in itself. As the Tesla truck won't change gear, it would see less frequent changes in load.

Four motors driving each rear wheel directly and independently will further lessen the strain on the frame compared to one big frame mounted engine and gearbox.

[rmay635703]

Originally Posted by RedDevil

I think fatigue failures are mainly due to lots of changes in load rather than the load in itself. As the Tesla truck won't change gear, it would see less frequent changes in load.

Four motors driving each rear wheel directly and independently will further lessen the strain on the frame compared to one big frame mounted engine and gearbox.

A maximum braking event brings many big rigs frame and xmbr s up into the yield zone and that is “as designed “

These trucks ladder frames aren’t made to last much more than 10 years in most cases.

Re rails and gliders are common in the industry for this reason

So yes heavy, steady braking or acceleration will cause accelerated wear unless it’s in the design case.