Have you seen a field gun race, they take it apart, over a gorge, through a small hole and put it back together again, the ultimate destination of your comment. The guys that do/did it were super fit and the competition is insane
True, which is why after certain point you see concepts that are only used in city buses because nobody sane would ever want to think ""Why yes sir I would very much like to have to do a 12 points turn following at least six dimensions of rotation whenever I'm interested in changing direction on a 1½ lane street."
If anyone is curious, quite a few actual production cars did successfully implement 4 wheel steering in their vehicles, Nissans HICAS system comes to mind but there's a few more
And many trucks designed for heavy loads or rough terrain such as quarries utilise multiple steering axles, and trailers used in cities where loading spaces are often tight utilise steerable axles on the trailer. The trailer steering axles are typically automatic but can be manually controlled when required.
Acura, Audi, BMW, Lexus, Porsche, Ferrari, and Mercedes have all got a few modern cars with all-wheel steering. The rear wheels might not turn as much as the front ones but they certainly do.
@@sandman_-_ Toyota Celica GT4 also has 4 wheel steer. Built in the 1980's. The rear wheels only turn approx 5 degrees from center but it drastically enhances high speed cornering and grip. The problem in that period was it was a complex control system but with modern electronics 4WS has made a comeback.
This method is actually used for real vehicles. Skid Steers use 2 sets of wheels or tracks, tanks do the same with tracks. I believe the electric Hummer also supports that form of steering but I'd imagine it's not good for the tires.
But it hurts the wheels on solid ground. But on sand, mud, soil, snow and gravel the ground will shift around the wheels as it is dragged sideways, so it's not so bad.
It would be interesting to also include the effect of wheelbase on the turning circle, and show how a compact car can turn much better than a large truck or SUV, and how even long buses can achieve reasonable turning circles with large rear overhangs.
THIS! The overhang of a vehicle does wonders to its steering circle. When i first got my truck licence i was amazed how the reverse-manuevers behave differently from my no-overhang compact car. Would be even more interesting seeing it for a BUS! From the sky view even!!
It's all about the wheelbase. London has its iconic Routemaster red buses with wheels near the ends, for a terrible turning circle. But also modern city buses with short wheelbase and a lot of overhang that can take much tighter bends
In a nutshell, the outside and inside wheels have to cover a different turning radius Ackerman makes it so the inside wheels turn a bit tighter than the outside wheels
I think the 4 wheel steering one would have been better with a central differential. It sounded distinctly unhappy and that's the first thing that I can think of that might have caused that.
could also be because the steering linkage is inexact. the inner wheel should turn more than the outer also, the wheels are thick, so you will have some friction regardless
Modern logging trailers do (sometimes) fold up right into the semi-truck. Completing essentially the same task, taking something very long and unwieldy, and making it turn much tighter than it’s normal length would allow.
I agree to this idea! What a wonderful silence afterwards when I left my kids waiting in the car while going for shopping. Don't have to buy minced meat either.
@kaz49 Or better yet, implement better public transportation and have less people drive cars. Then we wouldn't need as much parking and there would be less traffic. Plus more jobs. Essentially a win for everyone.
In the low-speed low-slip case it makes no difference. Where it makes a difference is with real, pneumatic tires that the contact patch deforms under load which isn't modeled here. In basic models of real cars, that's modeled as a sidewall stiffness factor.
Differential steering is also often called neutral steering. Most modern tanks and other tracked vehicles have this feature so they can maneuver about in very tight spaces or in areas with inconsistent terrain.
I wanted so much more. Any ability to incorporate some casters in front/behind some drive wheels? I think some function to perform as well to make the designs meet a constraint.
I know, right? Honestly, I fully expected him to make something super overkill or ridiculous by the end, like omnidirectional wheels or a hamster ball. This was... almost underwhelming. Surely there's a part 2 in the works.
And then there are tracked dumpers with a tracked undercarriage and a rotating dump body and cab. It can drive both directions without needing to turn the tracks and then it only rotates the upper part 180° whenever it gets to the loading or unloading spot.
There's one missing that is simple and very effective. Crawler style : rear axle locked completely and front wheel drive turn . The radius is pretty much the wheelbase. The rear acts as an anchor
man i i laughed at the transforming vehicle design ...i can see it now ....ya just fold your vehicle in half and you can turn here :> still a great video
If you make it so all 4 wheels have independent steering and power, you can effectively have differential steering without the massive power requirements of differential steering by just aligning all 4 wheels tangent to a circle and pretending it's differential steering from a controls perspective.
1. А-образной формы вертикально ломающуюся раму еще можно собрать, будет поднимать ось сгиба вертикально вверх. 2. Использовать в поворотной оси одно колесо, по сути трицикл. 3. Гиростабилизированая двухколесная платформа. 4. Шагающая рама. 5. Реверсивное движение платформы, без разворотов и любым количеством осей и нагрузки весовой, заехал и выехал :)
The last one just showed the flaw of a test like this. It won't matter if my vehicle turns like a standard car, it out-turns yours due to it being something tiny like a hot wheels toy car that can fit inside the 18cm diameter.
2:50: Brick-Experiment-Channel, you could make this thing into like an AutoBot or something. Or you could make an AutoBot body on the transforming vehicle or something like that.
