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Questions tagged [wheels]

The tag has no usage guidance.

-3
votes
1answer
177 views

Can a rolling wheel create a side force without first rotating on a vertical axis at its contact patch? [closed]

There is something wrong with the way we describe how a cornering vehicle wheel creates a cornering force. I think a rolling wheel must first rotate on a vertical axis to then create the cornering ...
1
vote
3answers
72 views

Why is the rear wheel of the Penny-farthing so small?

I see a lot of people asking why the Penny-farthing's front wheel is so big, and I think I've read enough materials to understand why (at least, at the most basic level). But even so, I feel that the ...
0
votes
0answers
44 views

Design a wheel with the axis only magnetically coupled to the rim

I'd like to know wether it is possible (or has been realized) to design a wheel whose axxis is not connected to the rim of the wheel, using something I would call "magnetic spokes". I imagine the ...
4
votes
4answers
123 views

What makes scooters unstable at high speeds?

Scooters and skateboards are obviously meant for slower speeds, below 5 MPH. Typically if you go faster than that, it becomes harder and harder to control the scooter, and you will fall off. An ...
1
vote
0answers
100 views

How to regulate torque/RPM on an IWD vehicle

Generally, I'm interested in simple (DIY) electric vehicle design problems. I saw some photos of electric vehicles as in the following pic: or also you could check this youtube video. The vehicle is ...
1
vote
0answers
64 views

Cone shaped train wheels

I was watching this Feynman video and (as usual) his explanations make a lot of sense. Now I just took a train, and am not so sure anymore. Looking at the train wheels they did not appear cone ...
0
votes
2answers
74 views

What is an advantage/disadvantage of difference wheels size in front and rear of a bicycle?

Suppose there is a vehicle with difference size of wheels in front and in rear. Specifically bicycle, There would be 2 cases that front wheel larger than rear wheel and vice versa I would like to ...
2
votes
3answers
119 views

What mechanism can make a wheel turn in discrete steps?

I want to make a wheel that behaves pretty much like a mouse wheel does — when you rotate it with your finger and release, it rotates back or forward by itself to match a nearest discrete position. ...
0
votes
1answer
157 views

How do I attach an electric motor to a trailer wheel?

I have an electric motor which is intended for a bicycle/scooter and has a 11-teeth chain sprocket. I plan to use it to spin a trailer wheel (which have 4 holes for bolts about 3'' from the center). ...
3
votes
0answers
71 views

Torque needed to keep a wheel spinning at high RPM

I have a treaded wheel which is 16'' diameter and 4'' across (trailer wheel). If I want it to spin constantly at 2750 RPM, what amount of torque do I need to apply to combat friction and air ...
3
votes
2answers
77 views

Surprisingly Low Efficiency of Compound Machine [Project Help]

I'm working on a school project that requires us to build a compound machine with a mechanical advantage of 9. It should be able to lift a 10oz soup can three or more inches by using the weight of ...
0
votes
1answer
26 views

Compression and check valves

Pressure pumps are used to apply pressure to a system. What would happen if someone attempted to fill, for example, a bicycle tire (with a check valve) to 2 ATM of pressure using a pressure pump that ...
0
votes
1answer
70 views

How To Mount a Large Diameter Tire To A Smaller Diameter Axle? [closed]

I am building a cart from (What Type of Tires and Wheels Do I Need to Make a PVC Beach Cart?). I have a wheel whose central diameter is 3 inches and the PVC for the axle is 1 inch in diameter. I am ...
2
votes
3answers
1k views

Reason of Using exactly 5 Wheel Studs per Wheel

So today when I was taking a taxi and looked at the vehicles, I observed that the majority of the light vehicles (i.e. 16-person minibus/ 4-6 person cars) use 5 (or less frequently, 6) wheels studs ...
1
vote
3answers
82 views

Why are automotive brakes set inside the wheels, and not on the axles?

In most (maybe all?) automobiles, the drum or disc brakes are positioned at the end of the axles, inside the wheel. This increases unsprung mass, which reduces handling performance. Would it not be ...
1
vote
1answer
57 views

Why do baseball pitching machines have wheels stacked instead of side by side?

I was working on a project where I have to launch a ball. The current design has two wheels that are side by side with the ball going between them. I noticed that in almost every commercial ball ...
3
votes
0answers
415 views

How to make wheel rotate slower in one direction than the other?

For one axle with one wheel, can the following rules be met and if so, what would be the most simplistic implementation? Rule #1. Axle rotates clockwise: Wheel rotates at a 1:1 ratio with the axle. ...
2
votes
2answers
855 views

How to add traction to a wheel?

I am not a professional in engineering and was wondering what I could use to add traction to a wheel. (I have to make a small self-car for a school project) I was wondering if there was a cheap or ...
1
vote
1answer
5k views

Difference between a “Pulley” and a “Wheel and axle”

A "Pulley" and a "Wheel and axle" seem much similar to each other. What is their actual difference and what are their precise definitions? My understanding of the two terms is much relied on the ...
11
votes
2answers
198 views

Is a chair with N+1 wheels ever less stable than a chair with N wheels?

My workplace has a policy to provide standing desks upon request, but no policy to provide chairs of matching height. (I work for the government...) We can buy our own, or build our own. However ...
3
votes
2answers
2k views

Force required to move object on wheels

I'm trying to find the best way to move a heavy weight around. Probably the best way is to put it on wheels but I don't know which physics concepts it involves so I can make a better research. I have ...
1
vote
1answer
499 views

How do I model the friction on a rolling pulley wheel, which holds weight, on a horizontal cable?

I am currently designing a motorized zipline trolley that will carry a person on a horizontal cable, so I am trying to calculate the friction on the wheels to determine what kind of motors I need. I ...
0
votes
2answers
144 views

Equation for comparing force delivered to road at wheel based on varying gear ratios?

By introducing many new gears and changing the tire size I am altering the torque delivered to a rear bicycle wheel from an electric motor. This then changes the "power where rubber meets pavement". "...
-1
votes
2answers
99 views

Can a six-wheeled F1 car have a better acceleration profile than a typical F1 car? [closed]

I wonder whether the P34 died too soon. Basically, I'm wondering whether the additional pair of wheels could have conferred the car any advantages that, if solved, would have given it an advantage ...
1
vote
1answer
86 views

Does toe-in in the wheels of a car help with straight-line stability without steering?

For vehicles that cannot steer (built to travel in a straight line) does having the wheels toe inwards help with straight line stability? That is, will it make the vehicle go straighter with slight ...
1
vote
0answers
108 views

How is rolling resistance accounted for in the Pacejka Curves?

I am simulating the acceleration of a car (FSAE) in a straight line. I have data of the Pacejka Curves ($F_x$ vs. $SR$) of the tire we will be using. The thing is that the curve doesn´t pass through ...
1
vote
1answer
536 views

Pacejka Formula - natural values

For my racing game I am using a simplified Pacejka Magical Formula: $\mu_{lateral} = \mu_{0} * \mu_{1} * D * \sin(C * \arctan(B * x - E * (B * x - \arctan(B * x))))$ Where: $\mu_{lateral}$ is ...
3
votes
1answer
262 views

Wheel rolling resistance

I think that some of you know what is rolling resistance. It is force that works in opposite direction to roll and is caused due to deformation of tire. It also affects car wheels. There is one ...
0
votes
1answer
630 views

Car Suspension Force Equations

So I have found this equation: $F_\mathrm{suspension} = Kx + F_\mathrm{damper}V_\mathrm{contact}$ Where: $K$ = spring stiffness $x$ = the contact depth of spring(also known as spring compression) $...
5
votes
1answer
8k views

RC car steering mechanism type

I need to figure out what type of steering does this 1:10 Himoto Buggy Zmoto Z-3 RC car have in order to be able to calculate the steering angle from servo position for a robotics project. Is it the ...
1
vote
1answer
601 views

Design of Wheels/Tires for a RC Car [closed]

Background Information: My design team is trying to create a small RC car that can climb a 30 degrees incline that is 6inches high. We have two motors on a 3 wheels vehicle with the motors powering ...
19
votes
7answers
5k views

Why do cars turn by turning the front wheel?

Why do we design cars to turn by turning the front wheel? Wouldn't it better to keep all wheels straight and turn by rotating the wheels on one side of a car more then the wheels on the opposite side ...
6
votes
3answers
298 views

Why do cars have beveled tires?

If you look at a tire from the rear, you'll notice that the tire isn't quite a cylinder. It has edges that are slightly beveled. Sometimes this effect is clearly apparent, but other times, as in many ...
19
votes
6answers
11k views

Why do car wheels have holes?

If you have a look at the car's wheels, you'll notice that they have holes which can be of different forms (mostly circular or rectangular). Why do they have such holes? Doesn't that reduce the ...