Design a racing motorcycle that meets the FIM technical regulations to perform in the Moto3 World Championship.

1. Design of a Moto3 Racing Motorcycle
MSc Dissertation
David Ojea Cerradelo
September 2011

2. Moto 3 is the four stroke replacement for the 125cc class, which has been a
mainstay of the World Motorcycle Championship since it's inception in 1949.
This switch reflects the lack of interest in two stroke technology in today's
motorcycle market.
• Prototype Chassis
• Carbon fiber fairings
• Single cylinder 250cc 4 strokes
Features
• 148kg minimum (including driver)
• Circa 50hp
• 0-100 kph in 5sec
Introduction

3. - Complete a technical research
- Solid modelling of the complete motorcycle chassis components
- Structural analysis of main frame and swingarm
- Design front and rear suspension
NOT INCLUDED
- Design motorcycle fairing
- Assess performance of the motorcycle
- Business case
Objectives
Design a racing motorcycle that meets the FIM technical regulations to
perform in the Moto3 World Championship.

4. Geometrical Concerns
- Similar handling to 125 GP bikes
- Adjustable Design (wheelbase, castor angle and trail)
- Chain Angle, Squat , CofG position and Ergonomics
Wheelbase, castor angle and trail define the geometry of a motorcycle

5. Components Design
Prototype components
- Main Frame (Reynolds Steel 631) and Swingarm (Al 7079). Stiffness
to Weight optimization
Proprietary components
- Front Fork, Rear Shock, Engine, Wheels…

6. Suspension Design
Front Suspension
- Castor optimization
Rear Suspension
- Rising wheel rate
- Linkage Hardpoints

7. Results
• Main frame and swingarm heavier than 125 GP designs
• Chassis stiffness meets suggested racing motorcycle targets
• The wheel rate avoids bottoming out of the suspension
Future Work
• Incorporation of Flexible bodies and FTire model
• Simulate rider behaviour and chain reaction for dynamic study
• Design motorcycle fairing
• Evaluate performance in a lap time simulator
Conclusion
A motorcycle capable to perform in the Moto3 championship was designed. This
design incorporates tools to get the best possible setup for every track and rider by
mean of adjusts in wheelbase, caster angle and trail.
Results and Conclusions

8. Questions & Answers
Thanks for your attention