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K’NEX Air Balloon

We made this balloon by the scheme. To make the balloon rise and fall smoothly, we throw the rope several times over the cornice and clamped the ballon on a pin threaded into the motor. We haven’t yet figured out how to secure the motor, so someone have to hold it in their hand and tilt it down a little.
My daugter made the sun using the same principle – in the morning it rises to the ceiling, and in the evening it goes down.

K'NEX Air Balloon
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K’NEX Education ‒ STEM Explorations: Roller Coaster

It seems that K’Nex absolutely loves carnival rides. This is another ride-themed set with a small motor. It offers to build roller coasters with a moving car. Since this set belongs to the Education series, it offers small experiments that explain physics to children with the models they build.

K'NEX Education ‒ STEM Explorations: Roller Coaster