Front Wheel Drive or Rear Wheel Drive has higher maximum slip ratio?

In summary, the conversation discussed the relationship between longitudinal force and slip ratio under certain conditions, and questioned the differences between front wheel drive (FWD) and rear wheel drive (RWD) vehicles in terms of maximum slip ratio. It was concluded that both FWD and RWD have similar maximum slip ratios and that the difference in handling between the two types of vehicles is due to the normal force acting on the tire.
  • #1
calvinyeh
3
0
The graph is relationship between longitudinal force and slip ratio under the conditions of 0 longitudinal acceleration and flat road(0 angle of inclination). Which line represent FWD or RWD? Does FWD or RWD have higher maximum slip ratio?
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  • #2
too general a question - there are rear wheel front engine vehicles
there are rear whee rear engine vehicles
there are front wheel drive front engine vehicles and the one i really like is
Front wheel drive rear engine vehicle
Buckminster Fuller ( who should have stuck with geodesic domes) introduced the
Dymaxion Chronofile ... i can't make this stuff up!

all with different handling characteristics ..slip ration being one , aspect two dimensional
 
  • #3
In this case they are both front engine
 
  • #4
Ok , let us think about this. I assume the chart is for the front tires, correct? Both front engines. which will be able to provide more traction when cornering and why? You have the same forces ( gravity) at static. Why will one be able to handle the straight line momentum better when in a turn? why is this? Both are same tire width, diameter and compound.

The chart is a nice chart but it is just that..a nice chart. there are many many posts relating to tire slip angle on this very mechanical eng forum..suggest you do a search and read upon these.
 
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  • #5
From what I have found, generally FWD vehicles have better traction because the weight of the engine and transmission are over the front wheels. This means better traction in snow and rain than RWD. But RWD has better performance when turning. So does it mean FWD will have a higher maximum slip ratio(before vehicle start slipping) which refers to line 1 in the graph?
 
  • #6
calvinyeh said:
So does it mean FWD will have a higher maximum slip ratio(before vehicle start slipping) which refers to line 1 in the graph?
The graph you shown is related to a tire, regardless of where it is mounted.

The two cases shown on the graph have both the same maximum slip ratio: 1. When the slip ratio is not equal to zero, the tire is slipping. Slip is necessary to create friction, and thus a friction force (Longitudinal force on the graph). The graph shown relates to the concept of static & kinetic friction like this:

Static+friction+and+kinetic+friction.jpg

The friction force increases linearly in the 'static' region (close to 0 slip); The peak region on your graph relates to the region where it switches from static to kinetic friction. It then stabilizes at a lower constant force at slip ratio = 1.

The difference between the two cases is most likely the normal force acting on the tire. Whether it is RWD or FWD is irrelevant.
 

1. What is the difference between front wheel drive and rear wheel drive?

Front wheel drive means that the power from the engine is transmitted to the front wheels of the vehicle, while rear wheel drive means that the power is transmitted to the rear wheels. This affects how the vehicle handles and performs in different driving conditions.

2. Which type of drive has a higher maximum slip ratio?

Rear wheel drive typically has a higher maximum slip ratio compared to front wheel drive. This is because the weight of the vehicle is more evenly distributed between the front and rear wheels, allowing for better traction and control.

3. How does the maximum slip ratio affect the performance of a vehicle?

The maximum slip ratio is the point at which the wheels of a vehicle start to lose traction and slip. A higher maximum slip ratio means that the vehicle can maintain better control and stability in slippery or uneven road conditions.

4. Which type of drive is better for different driving conditions?

Front wheel drive is typically better for driving in wet or snowy conditions, as the weight of the engine is over the front wheels, providing better traction. Rear wheel drive is better for dry, smooth roads as it allows for better acceleration and handling.

5. Are there any other factors besides maximum slip ratio that affect the performance of front wheel drive and rear wheel drive vehicles?

Yes, there are other factors such as weight distribution, suspension, and tire grip that can also affect the performance of a vehicle. Additionally, the driver's skill and experience also play a significant role in how a vehicle handles and performs.

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