Djuiinostar Vehicle Engine Model Assembly Kit (350+ Pieces Components, 3 Hours Assembly Time), Eight-Stroke Straight-Eight Gas Engine Working Model, 8

Mould King 10171 V8 Engine Building Blocks Sets, V8 Engine Model Kit That Run, Build Your Own STEM Model Engine, 8-Cylinder Car Engine Building

Estes 7287 Sidekick Rocket-Building Kit, Advanced Flying-Rocket-Model Kit For Ages 10+

Occre 54000 1829 Rocket Locomotive 1:24 Scale Kit

Estes 009991 Space Shuttle Model Rocket - Launch Up To 600 ft - Replica Rocket For Kids, Teens, & Adults - No Assembly Required - Launch Pad & Engine

Estes 2206 NASA SLS Flying-Rocket-Building Kit, Beginner Replica Flying-Rocket-Model Kit For Ages 10+

DM122 Mini Metal Turbofan Engine Model Kit That Works, 170+ Parts 1:20 Scale 4.41"H X 7"L X 3"W All-Metal Jet Engine Model With Transparent Cover,

OBIOCKIDAY Stirling Engine Model Kit For Adults, Hot Air Stirling Engine DIY Assembly Balance Metal Engine Motor Model, Electricity Generator Mini