Supply the arm
The valve feeds water through a rotary union.
Machines & motion
Feed opposing water outlets and explore the reaction that spins a cross-arm.

Load the 3D model to rotate and zoom. Approx. 4.1 MB.
Design concept shown in a fixed pose. The 3D view explores the form; effects and mechanisms are illustrative.
FROM ACTION TO DISCOVERY
The valve feeds water through a rotary union.
Water exits through outlets arranged tangentially at opposite ends.
The outlets' reaction produces a turning effect around the central axis.
A CLOSER LOOK
Explore the arrangement of a red rotating cross-arm, opposed tangential outlets and a transparent splash cylinder.
LEARNING THROUGH PLAY
This concept brings action and reaction, rotation and water jets into a shared water-table setting. Visitors can explore the idea at their own pace and compare what they notice with a partner.
Expelling water in one direction creates a reaction on the device.
Outlet arrangement determines how the reaction contributes to rotation.
The clear surround allows visitors to follow the moving arm.
PART OF A BIGGER WATER TABLE
Keep the valve accessible and the splash cylinder clear to view. Develop rotary sealing, flow and rotational clearances through prototype testing.
The arrangement can be developed for a museum, science centre or play space as part of a custom water table. Final dimensions, materials and operating performance are established during design and engineering.
See the complete water table exhibit →Let’s explore how Reaction Spin Cylinder could fit your water table.
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