グリーンサイエンス プロペラレーサー – STEM組み立てキット

The propeller actually spins fast enough to send the racer zooming across the floor, which made the science behind air power click for my nephew right away. He kept tweaking the wheel alignment on his own after the first build, so it’s genuinely engaging, not just a one-and-done craft.

My kids spent the whole afternoon building it together, and the propeller actually launches the racer across the floor when you wind it up. It's a solid little kit that made the science of motion click for them instantly.