With the idea now in place, and a rough drawing of how the mechanics should work to make the hippo work, Jon decided to test the plans on a small scale to make sure it will be possible. He used card to create the hippo shell, and a mixture of card, cocktail sticks, and a paper clip, to make the mechanism. We are pleased to say it all worked fine, but was driven by turning an external stick, not a motor, but the principal was the same, and the motor will be attached where this stick currently exists.
Below are a number of photos of this miniature test, and a video to show it working.
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