- Power plant hole 19-20mm diameter, 50-52mm deep, and drilled parallel to bottom surface of the vehicle. A minimum of 3mm
thickness around the entire power plant hole must be maintained on all vehicles for safety purposes. - The body of the model must be a one-piece, all-wood construction; no parts such as body strengtheners, fenders, plastic canopy, exhausts, or air foils may be attached to or enclosed within the vehicle. Bearings and lubricants may be used in construction. Two or more like or unlike pieces of wood glued together are not considered a one-piece, all-wood construction.
- Please note the following requirements:
a. Only two axles are allowed on a vehicle.
b. A maximum of eight spacer bearings are allowed.
c. A maximum of eight clips for interior wheels are allowed. Silicone or any other type of glue or adhesive may not be used in place of wheel clips.
d. A maximum of two screw eyelets are allowed. - Specific Tolerances:
| a. Axle diameter, only two axles allowed | 3mm | 3mm |
| b. Axle length | 42mm | 70mm |
| c. Axle bearing diameter | 3.5mm | 4.5mm |
| d. Axle hole diameter (center line) | 3.5mm | 4.5mm |
| e. Bottom of axle hole above bottom of car | 5mm | 10mm |
| f. Axle hole from rear | 9mm | 100mm |
| g. Spacer bearing diameter | 7mm | 9mm |
| h. Vehicle body length | 200mm | 305mm |
| i. Vehicle body height with wheels | 75mm | |
| j. Vehicle body mass with wheels (without CO 2) | 45g | 170g |
| k. Vehicle body width at axles holes, front and back | 35mm | 42mm |
| l. Vehicle body width including wheels | 80mm | |
| m. Power plant hole depth 50mm | 52mm | |
| n. Power plant safety zone thickness, total housing | 3mm | |
| o. Power plant chamber diameter | 19mm | 20mm |
| p. Power plant location-C/L from body bottom | 31mm | 35mm |
| q. Screw eye, inside diameter | 3mm | 5mm |
| r. Screw eye spacing-distance apart | 155mm | 270mm |
| s. Wheels, front diameter | 32mm | 37mm |
| t. Wheels, front width at greatest diameter, full circumference | 2mm | 5mm |
| u. Wheels, rear diameter | 30mm | 40mm |
| v. Wheels, rear width at greatest diameter, full circumference | 15mm | 18mm |
| w. Wheelbase | 105mm | 270mm |
No repair or maintenance on entries is allowed after the entries have been registered. Any entry damaged during the race is evaluated by the event coordinator to determine whether or not the vehicle is allowed to race again. In the event that the vehicle is damaged by conference personnel, the event coordinator makes a ruling as to whether or not the vehicle may be repaired by the student entering the vehicle. This is the only reason a STUDENT would be allowed to touch his/her vehicle after registration. Undamaged wheels that come off during the event may be replaced as determined by the event coordinator. Damaged wheels may not be replaced.
All entries must be delivered free of needed repair and/or maintenance at the time of check-in.
CO 2 cartridges are provided by Iowa Industrial Tech Expo.
Wheels must be made entirely from plastic.