She was Ugly, but FAST!!!!

Discussion in 'Jims Woodworking' started by SubnetZero, Jan 25, 2009.

  1. SubnetZero

    SubnetZero New Member

    Messages:
    1,619
    State:
    Sherman IL
    Second year building Pinewood Derby car.
    Race was today..

    We Took home 1st place out of the Pack!!!!

    Car was ugly, but man it was fast.

    Never could get the paint correct, then got graphite on it and it went downhill from there :eek:oooh:

    Luckily, it was fast enough to get the trophy heh, so my son didn't mind..
     

    Attached Files:

  2. Jerry60k

    Jerry60k New Member

    Messages:
    881
    State:
    Chelyan, West V
    Congrats my son has 2 Best of Show and a 1st place for his pack and got 22 in the states.

    Lots of thought and tricks to get those cars that fast.
     

  3. plainsman

    plainsman New Member Supporting Member

    Messages:
    7,187
    State:
    minnesota
    Pinewood derby is fun, I remember doing it, had a pretty good car. My brother did ok too.
     
  4. Catfish_Commando

    Catfish_Commando TF Staff Member

    Messages:
    7,005
    State:
    Georgia
    Interesting rear wheel config!

    Congrats on the win :wink:
     
  5. fishnfwl

    fishnfwl New Member

    Messages:
    3,334
    State:
    South Cent
    Congrats Tim! Dang man from the photo finish looks like you were blowing the field away to say the least...... Great job "Dad" great for your boy!
     
  6. Mickey

    Mickey New Member Supporting Member

    Messages:
    14,592
    State:
    Illinois
    Tim congrats to you and your boy on the 1st place win. WTG.
     
  7. katcatchingfool

    katcatchingfool New Member

    Messages:
    2,032
    State:
    illinois
    I have two boys in cub scouts we are going to race next Saturday. I will let you know how we do.:smile2::smile2: Congrats on the 1st place!!!
     
  8. willcat

    willcat New Member

    Messages:
    2,463
    State:
    texas
    i remember those days, congrats
     
  9. SubnetZero

    SubnetZero New Member

    Messages:
    1,619
    State:
    Sherman IL
    Thanks everyone..
    Pack is paying our entry fee's into the District race, so I guess we'll see how we do there at the end of Feb..

    Can't really change much since I glued the axles in, so I guess we'll just re-graphite the wheels and let her rip... Should be fun either way...
     
  10. chambers bd

    chambers bd New Member

    Messages:
    1,134
    State:
    Sautee,Geo
    I won state back when I was a scout with some coaching from dad, The key was taping pennies to add the right weight and put almost a knife edge on the tires! Try the tire thing if you get a chance it will really speed it up!
     
  11. 223reload

    223reload New Member

    Messages:
    10,798
    State:
    Oklahoma
    Thats awsome,Tim. Congrats to your son on a swank lookin car.
     
  12. Jerry60k

    Jerry60k New Member

    Messages:
    881
    State:
    Chelyan, West V
    Better check the Districts rules because some do not allow anything but deburring of the wheels.However make sure the wheel is perfectly smooth and the molding line is completely sanded off.

    Just as a small tip for the next build make your axles tilt so that only a small margin of your tires make contact,that will give you the effect chambers_bd was mentioning without modifying the tires.

    Another good trick is to sand the burs and the little hump off each wheel nail.Then take some valve grinding compound and put just a dab inside the wheel and spin the tire over and over to match the axle and wheel together but be sure not to mix them up (and wash the grinding compound off before assembling).The longer you can make the tire spin on the axle the better.


    I sure wish my son would have finished his second year of Webelos this year.
     
  13. MRR

    MRR New Member

    Messages:
    4,947
    State:
    Louisiana,Mo.
    Con grads on the win. Look like one happy boy there (and dad).WTG.
     
  14. SubnetZero

    SubnetZero New Member

    Messages:
    1,619
    State:
    Sherman IL
    Thanks for all the comments and tips..

    Our rules don't allow us to modify the wheels to an edge or even round them. Just allowed to sand down the mold marks and we are allowed to cone the hubs.

    For the axles, we had those puppies shinning like a mirror.. Polished them up all the way to 2500 grit sandpaper (3 micron) heh, then finished with some Mothers metal polish (think its 1 micron) ...

    The back wheel configuration seemed to be a real bonus on adding speed :wink:
    (Gotta love physicists who like to tinker and then share info)..
    Amazing how much science you and your kid can learn from building one of these cars, if you put the research into it...

    The guy that owns the laptop with the software sent me a bunch of race stats..
    Here are the times from the finals (6 fastest cars racing for the trophies)

    **Names and other info removed to protect the innocent****
    Pos -- Total * -- Avg ------- Min ------- Max
    1 ---- 21.883 --- 3.6472 -- 3.626 ----- 3.674
    2 ---- 22.145 --- 3.6908 -- 3.654 ----- 3.718
    3 ---- 22.203 --- 3.7005 -- 3.659 ----- 3.747
    4 ---- 22.227 --- 3.7045 -- 3.696 ----- 3.719
    5 ---- 22.231 --- 3.7052 -- 3.688 ----- 3.75
    6 ---- 22.51 ---- 3.7517 -- 3.722 ----- 3.78

    49ft track in about 3.5 seconds using nothing but gravity..Cool stuff!!!!
     
  15. SubnetZero

    SubnetZero New Member

    Messages:
    1,619
    State:
    Sherman IL
    Sorry I missed this the first time...

    Ya, please post about it.. Make sure you get plenty of pics, Win or Loose, these memories will last :big_smile_2: