Cubmobile Building Tips & Pictures

(Please note: information on this website, Derbyspeed.com, is for general use only.  All safety precations should be taken when building a cubmobile, pinewood derby car or any project that involves using tools for that matter, and the user assumes all risks.)

Low Center Gravity Cubmobile

Submitted by JSTA6 on www.Derbytalk.com

LCG Cubmobile Construction Guide

Front and rear axle = 2x4 cut 28” long (same as old style cubmobile).  Bolt for front axle is same as old style cubmobile.   4” machine bolt.  Used two washers in between front axle top and bottom.

Sides of cubmobile = 52” (same as old style cubmobile)

            Notch 4” long (1 ½” deep) front and back to make room for axles

Notch 1 ½” deep x 1 1/2” wide for footrest = first notch starts at 11” from front; second notch starts 15 ½ inches from front.

Wood under front and rear axles = 2x4 cut 17” long = side supports and front axle are attached using lag bolts.  Pre-drill holes first.  We used two, but it may have been better to use one.

Wood behind seat = 2x4 cut 17” long

Plywood for bottom of cubmobile = 20” x 48”

Hand brakes = 2x4 cut 16” long.  Bolt for hand brakes are same as front axle.   4” machine bolt.  Used two washers in between hand brake and cubmobile side frame rail.  One end cut slightly for clearance.  Round out the edges with a jigsaw and use electric sander to smooth out.  Holes for kid’s hands are 4” long; use 1” drill bit on either side of hole and use jig saw to finish.

 Steering wheel column base = 2x4 cut 3 ½ x 3 ½” = drill hole for steering column / broomstick slightly on an angle

Steering column = broomstick cut 27” long

Small steering support (same piece as hand brake) = 8”

Large steering support (same piece as hand brake) = 11”

Both steering supports attached with wood screws and large washers

Foot rest = 2x4 cut 20” long with “notch” in the middle to make room for steering column.

Steering wheel base = 2x4 cut 3 ½ x 3 ½”

Steering wheel = 1x6 cut 10 ½” long; round out the edges with a jigsaw and use electric sander to smooth out.  Holes for kid’s hands are 3” long; use 1” drill bit on either side of hole and use jig saw to finish.

Seat bottom = plywood 13” x 14”; (placed 2” from back of cubmobile)

Seat back = plywood 14” wide x 15” tall – rounded on the top

Seat back and seat bottom both covered with thin foam and pleather.  Used 3M-spray glue and staple gun.  I used “finishing” washers and plastic screw covers.

Seat post = 2x4 cut approx 10” long – slight angle on top and bottom (equal to the side braces).

Seat back side braces are same as from old style cubmobile.

Wheels – 10” Comtech.  Same lag screw as old style cubmobile. 

Body kit – corrugated plastic.  Sold in 4’x6’ sheets at sign stores.  Use a razor to cut one side of the sheet all the way down to create a “flap” that can be folded over.  I used black duct tape initially.  Then my wife and a buddy used double sided tape.

Sides were 47” long and 16” high.

Back was 29” wide and 16” high.  (Actually only 27” wide, as 1” on either side was used for the flap).

Front was 22” wide and 16” high.  (Actually only 20” wide, as 1” on either side was used for the flap).

Hood was 21” long  (actually only 20” long, as 1” in the front was used for the flap).  Hood was 23” wide in the front and 26” wide in the back (again, minus 1” on each side for the flaps).

I used “L” brackets to keep the body on the car.

Flames – when I was at the sign shop I got some yellow vinyl.  My wife cut it to look like flames.  We didn’t have any red vinyl, so she used double-sided tape (with the red tape still on one side) for the red part of the flame.

The headlights were just some round Styrofoam with a vinyl sticker on it.  Because I ran out of time, I just used some duct tape to hold them on.

The taillights were also just some round Styrofoam with a vinyl sticker on it.

Hubcaps = I cut a white piece of the corrugated plastic in to an 8” circle.  Then I applied a red 6” piece of vinyl, then a mirror / chrome 4” piece of vinyl.

License plate = you can use a rectangular piece of Styrofoam.  Cover it with a white piece of vinyl.  Little orange state of Florida symbol can also be an orange piece of vinyl cut by the printer / sign shop.  They can also make the "PCK 420" for you.

Building a cubmobile or derby car can be a fun project to do with your children.  The process is also a good teaching experience.  They learn basic math, a respect for working with tools and really can embrace their creative side.  Later in life, many of the same skills they can apply to engineering, construction, or military universities and so many other different trades.  Oh and the cars turn out pretty cool looking too!