video thumbnail 15:59
EASY Pinewood Derby Car WINS using Science!!!

2014-04-16

[public] 25.0M views, 324K likes, 7.76K dislikes audio only

channel thumbMark Rober

7 simple steps that ACTUALLY MATTER to building a winning pinewood derby car. I built a car in 45 minutes using these steps and crushed all the competition by more than 2 car lengths (proof is in the video :) Special thanks to Steve at DerbyMonkey.com for providing his expertise and materials for the video.

CONSIDER SUBSCRIBING: http://tinyurl.com/MarkRober-Sub

HERE'S HOW I MADE THE ROCKET CAR: /youtube/video/vlBxPjxacsk

7 Key Steps:

1. Max weight ~1" in front of rear axle

2. Reasonably aerodynamic

3. Ride on 3 wheels

4. Lightweight wheels

5. Bent polished axles

6. Railride/alignment

7. Lots o' graphite

***HELPFUL LINKS***

Dr. Acton's video: http://pinewoodphysics.com/index.html

Pre-polished, bent axles to purchase: https://www.maximum-velocity.com/product-category/pinewood-derby-wheels-and-axles/derby-car-axles/

Lightweight wheel options to purchase: https://www.maximum-velocity.com/product-category/pinewood-derby-wheels-and-axles/bsa-speed-wheels/

More details on polishing the axles: http://youtu.be/wdd-ZFbemIU

Axle bender tool: http://youtu.be/ZpNRt0F1YXQ

More details on Rail Rider alignment: http://youtu.be/9H96uufnygk

***MY STUFF***

I make videos like this once a month all year long while supplies last:

CHECK OUT MY CHANNEL: http://tinyurl.com/MarkRober-YouTube

FOLLOW ON TWITTER: https://twitter.com/#!/MarkRober

FACEBOOK ME: https://www.facebook.com/MarkRoberYouTube

***MUSIC***

All music created by Qwiet. You should go sub his channel:

http://youtube.com/qwietmusic

Twitter: http://twitter.com/qwiet

Facebook: http://facebook.com/qwiet


start the height of your centre of masses on the track
/youtube/video/-RjJtO51ykY?t=98.949997
putting it in the right location towards the rear of the car
/youtube/video/-RjJtO51ykY?t=217.07899
put all your weight toward the back of the car
/youtube/video/-RjJtO51ykY?t=235.28999
concentrated the mass in different locations on the car
/youtube/video/-RjJtO51ykY?t=291.60001
run through the remaining list of the critical parameters
/youtube/video/-RjJtO51ykY?t=324.51001
rotating about the axis
/youtube/video/-RjJtO51ykY?t=352.62
minimize the moment of inertia on each of the wheels
/youtube/video/-RjJtO51ykY?t=367.47
reduce your surface area by a factor of two
/youtube/video/-RjJtO51ykY?t=435.67001
adding graphite to your wheels and axles
/youtube/video/-RjJtO51ykY?t=479.10999
build a car from scratch in about 45 minutes
/youtube/video/-RjJtO51ykY?t=513.71002
mark the 12 o'clock position on the nail head
/youtube/video/-RjJtO51ykY?t=553.78998
bending the axle so to bend the axles
/youtube/video/-RjJtO51ykY?t=568.25
deepen one side of the pre-cut axle groove
/youtube/video/-RjJtO51ykY?t=622.67999
steer your car into the rail
/youtube/video/-RjJtO51ykY?t=668.93903
check the rear wheels
/youtube/video/-RjJtO51ykY?t=745.40002
measure an inch in front of the rear axle
/youtube/video/-RjJtO51ykY?t=758.84003
the canted wheel
/youtube/video/-RjJtO51ykY?t=785.71997
implement the rail riding technique
/youtube/video/-RjJtO51ykY?t=902.65002