200 Mph: The Tire's Persepctive

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When asked what the limitations of a sports car going 200 mph and beyond, most enthusiasts know horsepower and aerodynamics are the key.. But what few realize is that perhaps the biggest challenge …

When asked what the limitations of a sports car going 200 mph and beyond, most enthusiasts know horsepower and aerodynamics are the key.. But what few realize is that perhaps the biggest challenge and restraint as to higher top speeds is tire technology. Using RUF Automobile GmbH as the drop, this presentation outlines live at 200 mph from the tire's perspective.

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Transcript

  • 1. Life at 200-MPH
  • 2. 200-MPH Plus Speeds
    • Limitations:
    • Power
    • Aerodynamics
    • Tire Technology
  • 3. More Complex than you would think…
      • “ An Automobile is Easier to Make than a Tire”
            • Paul Haney, race engineer with a mechanical engineering degree
  • 4. The Tire’s Perspective…
  • 5. T Ü V Approval - 350 KPH
  • 6. 350 kph (217-mph)
    • Tire Rotates 50 times per second¹
    • Subjecting the tire to staggering amounts of centrifugal forces
    • ¹ Based on the rear tire of the RUF Rturbo which Michelin used to gain 350 kph T Ü V approval
  • 7. 350 kph (217-mph)
    • Internal Temps approach 300  F
      • How Quickly? - In just 5 to 10 minutes
      • Rubber does not “burn” until 400  F, but Physical Properties degrade long before that.
      • Challenge is to manage/balance temperatures across tread
      • Avoid Temp. differential between crown and shoulder
  • 8. 350 kph (217-mph)
    • Slightest Details Become Extremely Important:
      • Exact Tire Pressure
      • Precise Alignment Settings
      • Extra tire loads due to high-speed downforce
  • 9. 350 kph (217-mph)
    • Safety
      • How to warn driver when tire failure is imminent?
      • Engineering HOW the tires will fail
      • “ Chunking” to create warning
        • Creates “gun shot” Noise
        • Creates unbalanced wheel – vibration
      • Alerted, driver needs to roll off throttle
  • 10. Life at 200-MPH