Why are Li Ion UPSs so expensive?

Be careful of what you wish for. My father talked about a military truck with 4 wheel steering. The rear wheels turned counter to the front wheels, giving a remarkable turning radius. The problem was if you parked it parallel to a wall and came back to find something parked in front of and behind you.

I suppose a 90 degree rotation would be possible in an EV with a motor mounted in the hub of each wheel like some of the eBikes.

But would be much more expensive to do well for high steep road driving.

And the current steerable wheels arent anything like 90 degrees.

Eh? Surely that would only be a problem for the other drivers, since you can go out sideways and they can't.

Plus being a military truck you could just shove the smaller vehicles out of the way.

Aren't all EVs made like that, with the motors in the wheels?

Hello Rod, your writing style is so blatantly unusual I don't even have to look at the fake address, which is also following a very set pattern.

WTF is "high steep road driving" and what has it to do with tighter turning circles?

On the highway/motorway etc at something like 100 mph etc.

It is much harder to do that sort of high speed driving with wheels that can turn at 90 degrees so you can park sideways at the kerb.

There is a reason cars arent designed like that.

Only an Aussie would word it like that. Steep means an incline.

So why is it difficult to have a wheel which CAN (but doesn't always obviously) turn 90 degrees, go at 100mph?

Why did you delete the part where I called you by name Rod?

Were you missing me so badly that you tried to fall out of my killfile again?

You won't last long, you'll bore me within the day.

Sorry, didn't notice my typo even the second time around. I meant speed in the original and the auto correction turned it into steep.

Asks someone who has never had a clue about mechanical stuff.

The only real way to do it is like is done with trolley wheels that can do that and even you should have noticed how poorly they work at higher speed.

You basically need a vertical axle for the entire wheel to pivot around, as well as the axle that the wheel itself rotates around.

There are a very few industrial machines with all 4 wheels like that but they don't do high speed driving.

iirc it's about 3 degrees on the rear but I haven't been following closely.

Around here it would be following an old logging road with a 10% grade at 7000'...

No, you're not following. Turn the front wheels left and the rear wheels turned right. Try to get away from a wall in anything other than a fairly straight line and the rear runs into the wall.

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/ /

It was a WWI design and probably got rethought.

Ah, just like happens when you try to reverse a car (or worse a trailer) while getting away from a wall. The rear wheel steering needs to be adjustable. I assume on modern cars with it, it automatically avoids the wall situation.

I can never remember what those grades mean, either in metric or imperial. We used to have "1 in 4" - is that 1 up for 4 along, or 1 up for 4 lengths of road (ie. the hypotenuse)? Then we got the %. Again, a percentage of what? Is the up a % of along, or a % of the road length, or is the angle a % of vertical? It would be far more sensible to state it in degrees, everyone knows what that means.

Autocorrect sux, better to autounderline, then you can choose the right word.

If I knew I wouldn't have asked obviously.

A car's wheels naturally go back to centre if you don't apply force to the steering wheel. Increasing the maximum angle you can turn the wheels at won't affect that.

Or a nice joint that allows a sharper angle than the current one.

This speed, how does it make it worse?

Mine does both, presumably autocorrecting what it decides is obvious.

Only with the current systems which arent anything even remotely like 90 degrees and even then only when you are only a little off straight ahead,

It does actually even with the hard lock with the current designs. It isnt even possible with a 90 degree system with a vertical axle added.

Not even possible.

There is is no auto centring with a vertical axle and one is needed to get 90 degrees. And in fact you need a bit more than 90 too.

I doubt 3 degrees would be much of a problem nor do I think it would have much effect on the turning radius.

I wouldn't want to think about the repair cost if it breaks. BMW had a different system in the '90s that didn't last long on the market.

From an engineering standpoint I like the transverse engine FWD design. All the stuff is in one place turning in the same direction.

A moderately difficult hiking trail averages out to about 10%. Our interstate highways shoot for 7% but some local streets may get up to 15%.

But 100 feet in which direction? Flat on the map or along the incline? It's very ambiguous.

A percentage should be of the angle, then we'd all know what it was, 10% of 45 degrees should be 4.5 degrees.

Anyway 100% should be vertical.

Bollocks. I consider this to be moderate (without the "ly difficult"), and I'd estimate it to vary between 10 and 30 degrees, not 5.7:

I guess the limitation is for heavy trucks (what do you call actual trucks over there, since a big car is a truck in America?), and how dangerous it gets when icy.

Ever seen that when frozen? You'd be going a hell of a speed by the bottom. I guess you'd have to deliberately bash into the trees or railing to stop.

I wonder who or what bauersecure.com is, we've both ended up linking to them now, presumably from a google images search. I can't find them anywhere, and they don't seem to have an IP listed for bauersecure.com without anything before it.

There needs to be a button to disable it (or even better change to same direction) at very low speed - to make getting in and out of parking spaces easier.

I can't remember seeing an engine the other way round. I think the old Morris Marinas were that way, they had a very long bonnet.

Since you won't even admit you're Rod, f*ck off.