1. 2012 Pinewood Derby
Pack 17
Hatboro

2. Do your best Do your best and have fun.
Everyone who builds a car and races it is a winner
Show good sportsmanship.
No one “correct” way to make car.

3. “Look at my car go”

4. Message to Adults

5. Message to Adults (concluded)
Let the boys think up the design and do as much of the work as possible.
There is a Family Race for Dads/Moms/Sisters/Brothers/Etc for your creativity to shine.
Try to beat Cubmaster Bob in the Family Race.

6. What kind of car? Use your imagination.
Be kind to the adults (pick something you can do yourself).
Scout shop has standard designs that come with templates and decals.

7. Car Designs - Standard

8. Car Designs - Wacky

9. Car Designs - Wacky

10. Car Designs - Wacky

11. Car Designs - Wacky

12. Car Designs - Wacky

13. Car Designs - Wacky

14. Car Designs - Wacky

15. Car Designs - Wacky

16. Car Designs – Wacky

17. Car Designs – Fast but Ugly
(Don’t let this happen to you!)

18. What forces affect the car
Gravity
Friction
Air Resistance

19. Gravity

20. Gravity - Good Gravity pulls you (and everything else) to earth.
Gravity pulls the car downward –which causes it to go down the track.

21. Gravity Acting on the Car

22. Gravity Acting on Derby Car

23. Friction

24. Friction - Bad Friction is caused when two surfaces rub together.
Rougher surfaces have more friction than smooth surfaces.

25. Friction Acting on the Car
As the car goes down the track. Friction slows the car down
Cubmaster
Honer
Rules

26. Air Resistance

27. Air Resistance – Bad (a little)
Air resistance is friction between the air and the car.
The smoother the car shape the less air resistance.
Air resistance is not a major source of slowing the car down.

28. Air Resistance Acting on the Car

29. Which has less Air Resistance
Note: This car has an illegal length
(but it sure is cool looking!)

30. Derby Car Kit
Wood block
Four wheels
Four axles (nails)

31. Cutting the car body
Can use hack saw, jig saw, your teeth (just kidding) etc.
One area for adult to participate or supervise.
Scout should make a template (side view) of the car.

32. Cutting the body (concluded)
Leave the front flat so it will work the starting gate

33. Weight Remove light weight wood and replace with heavier metal weights
Place weight towards the rear of the car. Higher on the track = more height for gravity to work on the track.
Max weight is 5 ounces. Build to slightly less than 5 ounces and add weight at weigh-in.

34. Weight
Drill holes and fill with weights

35. Weight Distribution

36. Whoops! - Weight too far back

37. Types of Weights Zinc, Lead, Tungsten, Clay
Be careful with lead -- It is toxic.

38. Axles and Friction

39. Polishing Axles Debur the axles with a file.
Sand the axles with sandpaper.
Can use a drill or Dremel tool.
Use the “spin test”.

40. Axles Before Polishing

41. Axles After Polishing

42. Polishing Axles with Drill

43. Wheels and Friction Wherever wheels touch something there is friction.
Sanding your wheels can be tricky and error prone.
Smooth the tread and axle hole.

44. Smoothing the Wheels
After
Before

45. Wheel Mandrel

46. Attach the Wheels
Use the slots or make new holes using a drill press. Make sure they are straight with the car.
White glue or hot glue the axles in the slots.
Add dry lubrication (graphite).

47. Align the wheels

48. Crooked Wheels

49. Decorate
Make it cool
Paint
Decals
Figures

50. Great Decorations

51. Great Decorations

52. Great Decorations

53. Great Decorations
                                                                                                   

54. Great Decorations

55. Great Decorations

56. Great Decorations

57. Great Decorations
                                                                                                   

58. Great Decorations

59. Great Decorations

60. Great Decorations

61. Rules Length: 7 inches Width: 2 ¾ inches Weight: 5 ounces
Do not add items (weights/guns/spare tire etc) to the back/front of the wood block as it will be too long
Width: 2 ¾ inches
Weight: 5 ounces
No moving parts or loose items
Axle slots MUST be used !

62. Rules (concluded) Honesty is a Cub Scout Core value.
Make an all-new car each year.
The scout does most of the work.
Do not buy “speed” wheels/axles or pre-built cars from the internet – it’s cheating!
Have fun!

63. (Leave Space Here for car Number)
Labeling your car
Label the front bottom of the car as follows:
(Leave Space Here for car Number)
John Smith
Den 6
22012
Front

64. Advanced Car Makers Only

65. Pine Derby Quiz: Question 1
A Scout's primary goal in Pinewood Derby should be to:
a. Work together with a family member on a joint project
b. Acquire a healthy attitude about competition and sportsmanship
c. Become more proficient at woodworking
d. Survive the experience with all ten fingers

66. Pine Derby Quiz: Question 2
The fastest Pinewood Derby cars:
a. Weigh exactly five ounces
b. Have polished wheels and axles
c. Are well lubricated
d. Are powered by rubber bands, hidden motors, or small furry creatures.

67. Pine Derby Quiz: Question 3
When a Scout asks for help getting started on his Pinewood Derby car, the most likely answer is:
a. "Sure, son. Let's go have some fun working together!"
b. "Sorry, son. I'm busy working on my car for the Family race."
c. "What's the big hurry, son? The race isn't for a two hours."
d. “Be right there – Paul Pierce needs one more assist to get a Double-Double”

68. See you on race day!