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Rubber Band Car Student Seminar

Rubber Band Car Student Seminar. Brad Nunn BSIE Purdue University Program Manager - Citrix Feb 25, 2006. Today’s Activities. Typical rubber band cars Propeller based designs Review competition rules Component design Other designs Build a kit. Typical Rubber Band Cars.

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Rubber Band Car Student Seminar

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  1. Rubber Band CarStudent Seminar Brad Nunn BSIE Purdue University Program Manager - Citrix Feb 25, 2006

  2. Today’s Activities • Typical rubber band cars • Propeller based designs • Review competition rules • Component design • Other designs • Build a kit

  3. Typical Rubber Band Cars

  4. Typical Rubber Band Cars

  5. Typical Rubber Band Cars

  6. Typical Rubber Band Cars

  7. Propeller Rubber Band Cars

  8. Propeller Rubber Band Kit

  9. Propeller Rubber Band Cars

  10. Propeller Rubber Band Cars

  11. Propeller Rubber Band Kit

  12. Review Rules • Refer to Go Cart Competition Construction and Operating Rules

  13. Review Scoring F = 1D2 * W L • Consider tradeoffs - (D+L squared)

  14. Terminology • Potential to kinetic energy transfer • Torque • Acceleration • Speed • Momentum • Friction

  15. DesiredOutcomes • A small car that travels 2500 cm and doesn’t weigh much • A gradual transfer of energy that has just enough torque to establish motion • A sustained transfer of energy that delivers sufficient momentum to cover the distance

  16. Competitive Benchmarks • 2004-5: • 2003-4:

  17. Propeller Design • Airscrew - push or pull • Left hand or right hand when facing air flow • Airfoil shape like a wing

  18. Rubber Bands • All shapes and sizes • Experiment!

  19. Component Design • Low inertia and light weight

  20. Wheel and Axle Design • Minimize friction loss

  21. Lubrication • Graphite powder • Silicone spray (WD-40 is not recommended)

  22. Creative thinking • What advantage is there to winding a rubber band compared to stretching it? • Are there other ways to use a rubber band that is wound up?

  23. KNEX Kit – Rubber Band Roller

  24. Dixie Roller

  25. Dixie Roller • Dixie cup Axles • Rubber Band • Construction tool – fishing line • CD Wheels • Washer, grommet, bead bearing • Drive Lever • Driven nail or paper clip • Tape

  26. Design Challenges • How do you make one wheel drive and the other one follow? • How do you nest the rubber band inside the axle so it doesn’t rub? • Little torque so the friction in the bearing must be kept to a minimum • Little torque so the car must be light • Construction tool

  27. Iterative Design • Prototype • Measure and record performance • Tweak the design (farther, shorter, lighter) • Iterate • Replicate • Calculate • Celebrate

  28. Design optimization • Frictionless bearing • Frictionless unwinding of the rubber band • Thick or thin rubber band • Length of the lever arm • How many wheels • Wheel materials for low inertia

  29. Today’s Kit

  30. Tools for cutting, drilling, and assembly

  31. Aligning the Frame • Align the axle holes before gluing rails • Not the ends of the side rails

  32. Gluing the Frame • Use Gel Control Super Glue - NOT the Liquid (too watery) • Less is more…

  33. Problems / Solutions • What problems were encountered? • What solutions were effective? • What can be done for further improvement?

  34. Optimization • Enough torque to get moving? • Multiple propellers? • Travel straight? • How many winds? • Too many winds? • Smaller? • Farther? • Lighter?

  35. Most important • Have Fun!

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