Dismiss Notice
Welcome to
Pinewood Derby Online, a forum for questions and discussions about everyone's favorite gravity powered racers!
CLICK HERE to register as a member today for full access to the forum, it's fast, simple, and absolutely free!

Wheelbase and cog

Discussion in 'Building tips' started by Pinewood Outlaw, Jan 10, 2019.

  1. Pinewood Outlaw

    Pinewood Outlaw Workshop Leader

    Messages:
    163
    Likes Received:
    80
    Trophy Points:
    28
    Gender:
    Male
    Whats the best wheelbase for 3 wheel rail runner? 1/2, cog good or more towards 3/4"?
     
  2. TRE

    TRE PWD Royalty Pro Racer Pro Race Winner

    Messages:
    1,398
    Likes Received:
    292
    Trophy Points:
    83
    make the wheel base 4 and 3/4 put 12 cubes behind the rear axle and the rest righr in front of rear axle
     
  3. Pinewood Outlaw

    Pinewood Outlaw Workshop Leader

    Messages:
    163
    Likes Received:
    80
    Trophy Points:
    28
    Gender:
    Male
    I have drilled the rear axle location the same as standard.....so I just need to re drill the front forward a bit. I've used forester bit and dremel to add weight pockets as I've seen on other cars...my body is 3/8 thick and I've measured the pocket depth at just a hair over 1/4 so my tungsten cubes should fit good. I build similar rail runner last year for my daughter but made wheelbase longer and she lost the overall district race by .002...so this year trying to make sure she gets it
     
  4. FDM

    FDM District Champion

    Messages:
    138
    Likes Received:
    21
    Trophy Points:
    18
    Gender:
    Male
    Would this advice also go for the 2.1 ounce bar weight? I am afraid by putting the 2.1 behind the rear axle and then the rest in front of the rear axle the COG might become too aggressive. We building a rail rider and racing on a best track and I plan to use a 5 inch wheel base, but can make it shorter if that would make a faster car. We raced long wheelbase for a while now and did well with it, but we are looking to keep improving our speed.
     
  5. TRE

    TRE PWD Royalty Pro Racer Pro Race Winner

    Messages:
    1,398
    Likes Received:
    292
    Trophy Points:
    83
    Between a 4 and 3/4 and 5 you wont notice much speed difference..from 2.0 to 2.1 in the rear you wont notice much difference..the speed in tbe the drill of the rear end and the prep of thee wheels and axles
     
    Dizzy likes this.

Share This Page