Soap Box Division

1. Soap Box Division

2. Mission: • To provide children who have special needs with the self-esteem building experience of racing soap box cars. • The team must design and build specially equipped cars that will accommodate both the child and a co-driver.

3. Short Term Team Goals • Determine Project Partner’s needs • Analyze data taken from the regular Soapbox Derby Cars • Construct a Super Stock Soap Box Derby • Derive new concepts for a new Challenger Division Car • Create a computer generated Design of a 2 seat Challenger Soapbox Derby Car

4. Long-term Team Goals • Build and construct two Challenger Division cars for competition • Analyze the data taken from those cars to create a final production design • Construct a re-sellable car kit that can be distributed across the nation • Promote the Superkids Challenger Division on a national level.

5. Specifications Requested • Make the car wider. • Keep it simple and safe. • Try to maintain the look of regular stock car. • Make the car stronger and more durable. • Make it as easy as possible for a child with special needs to get in the car.. • Design it so that it may be repeatedly built by companies and families alike.

6. Specifics • 160 lbs. estimated weight limit per rider. • 425 lbs. payload . • 10ft long x 20in wide x 18in tall. • Steering is under car and uses a chain and sprocket idea that is protected by a skid pad. • Uniform Shell. • Keep the same current braking system. • Axles will be located beneath the car. • 5 point safety harness. • Lead weight distribution system. • Metal bracket for an optional head restraint. • A feedback steering system for the child with disabilities.

9. Original Ideas • Concepts • Adjustable seat • Retractable shell • New wheels, new brake system • Water ballast system

10. Current Concepts • Solid (non-retractable) shell • Chassis • Chain and sprocket steering system • Braking system • Weight balance system • Stationary seat • Wheels • Feed-back system • Axles

11. Shell Design 18”

12. Chassis Design Floor Board 20” 10’

13. Preliminary Force Analysis on Chassis Fd1 Fd2 4’ 2.5’ 1’ Fa1 1’ Fa2 10’ Factor of Safety of 1.25, yields

14. Chain and Sprocket Steering Will attach sprockets that can be purchased off the shelf and attach to axles. Sprockets will be of different sizes to achieve a gear ratio to make the steering similar to the current cars Sprockets Chain

15. Braking System • Use current braking mechanism with a larger brake pad

16. Feedback System • For the child with disabilities, we will have a steering wheel and brake connected to part of the car that will provide resistance, such as using a spring. • However, the child will have no direct control.

17. Other Systems • Weight balancing will use existing weights from Lafayette Soap Box Derby mounted on a bolt • Off the shelf seat will be used • Use axles found on current challenger car • Use existing wheels

18. Analysis • Force analysis performed more in depth on the chassis as well as perform FEA • Find the stress on the axles

19. Conclusion Improve upon the current design of the existing cars. Create a computer generated layout of a 2 seat Challenger Soapbox Derby Car Build and Construct 2 Challenger Division cars for competition in spring. Our ultimate goal is a re-sellable car kit that can be distributed across the nation

20. We’re always open to suggestions and looking for improvements, if something was unclear we can help to clarify it now.