The T-REX is a rubber band–powered, 1:15 sport-scale model of a vintage front-engine dragster. The laser-cut wood parts feature interlocking construction. The T-REX includes realistic details such as blower pulleys and belt, a distributor/magneto with eight holes, and cylinder heads with pre-cut openings—making it easy to add scale details like plug wires (wire not included).

The T-REX makes an eye-catching display model and is also a fierce competitor on the track.

Photos show the T-REX with optional “Raptor” spoke wheels, available separately.

Kit Includes

• All wood parts needed to build the racer and winding tool
• Pre-cut cockpit glass
• One set of front wheels with O-rings
• Rear foam tires and rim parts
• Drive shaft with pinion assembly (10 teeth)
• Crown gear (30 teeth)
• All small parts, nuts, bolts, and axles
• Competition rubber string
• Ballast washers
• Detailed building and racing instructions

Multipacks include one set of building/racing instructions.

Plug wires shown in some photos are optional and not included in the kit.

The T-REX shown is decorated using permanent markers.

STEM Performance Tuning

Improve your T-REX’s performance by applying Science, Technology, Engineering, and Math (STEM) principles. You can adjust:

• Power: Increase or decrease power with wider and/or additional rubber string loops.
• Gear Ratio: Choose different pinion and crown gears to enhance acceleration or top speed.
• Wheel Weight: Add weight to rims for increased traction.
• Overall Racer Weight: Add or adjust ballast for optimal traction and stability.
• Aerodynamics: Sand the racer for better airflow.

Overall Length: 15 inches (38 cm)

Curriculum Connection

Spotlight on Teamwork, Careers & STEM

(Available as a free download with each multipack purchase.)

We recommend that up to five students share one GADD racer and work together as a team.

Team Roles:

• Crew Chief
• Mechanic
• Driver
• Artist
• Public Relations Agent

Other students serve as race officials.

This real-life scenario gives students firsthand experience working together toward the common goal of winning a race.

For ages 12 to 99.