2012 Pinewood Derby Pack 17 Hatboro

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.

“Look at my car go”

Message to Adults

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.

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.

Car Designs - Standard

Car Designs - Wacky

Car Designs - Wacky

Car Designs - Wacky

Car Designs - Wacky

Car Designs - Wacky

Car Designs - Wacky

Car Designs - Wacky

Car Designs - Wacky

Car Designs – Wacky

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

What forces affect the car Gravity Friction Air Resistance

Gravity

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

Gravity Acting on the Car

Gravity Acting on Derby Car

Friction

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

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

Air Resistance

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.

Air Resistance Acting on the Car

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

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

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.

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

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.

Weight Drill holes and fill with weights

Weight Distribution

Whoops! - Weight too far back

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

Axles and Friction

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

Axles Before Polishing

Axles After Polishing

Polishing Axles with Drill

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.

Smoothing the Wheels After Before

Wheel Mandrel

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).

Align the wheels

Crooked Wheels

Decorate Make it cool Paint Decals Figures

Great Decorations

Great Decorations

Great Decorations

Great Decorations                                                                                                    

Great Decorations

Great Decorations

Great Decorations

Great Decorations                                                                                                    

Great Decorations

Great Decorations

Great Decorations

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 !

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!

(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

Advanced Car Makers Only

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

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.

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”

See you on race day!