Squirrel Showdown Hydraulics: How Hydraulic Systems Work

Quick answer

Squirrel Showdown hydraulics work because two syringes connected by tubing form a closed system: push one plunger and the trapped water or air pushes the other plunger with the same force. If your model feels weak or leaks, the usual causes are air bubbles, loose tubing, or a plunger that is not seated straight. Fix those three first, then test the arms slowly before a full-speed showdown.

The Squirrel Showdown is one of those builds where the mechanism is the fun part. Before you can stage a fair match, you need the hydraulics to move smoothly and predictably. That means understanding what is actually happening inside the tubing, not just pushing the plunger harder.

This guide walks through the hydraulic system in plain language, then gives you an ordered build-and-check process. Each step includes the mistake that most often causes a sluggish or leaking model, so you can catch it before play.

What the hydraulics are actually doing

A hydraulic system moves force through a liquid. In the Squirrel Showdown, one syringe acts as the input and another as the output. When you push the input plunger, the water inside has nowhere to go except into the second syringe, so the output plunger extends. Because liquid does not compress much, the motion transfers almost immediately.

That is the same idea behind construction equipment and car brakes, just on a smaller scale. For kids, the useful takeaway is that hydraulics multiply or redirect force rather than create it from nothing. If the tubing is kinked or air is trapped, the system still works, but it feels spongy and the arms respond late.

• Keep the tubing runs as short and straight as the build allows.
• Use the same syringe size on both ends unless the instructions say otherwise.

Why air bubbles cause most sluggish arms

Air compresses; water mostly does not. When a bubble sits in the tubing, part of your push goes into squeezing that bubble instead of moving the output plunger. The result is a soft, delayed response that feels like the hydraulics are weak.

Bleeding the line means filling the syringes and tubing completely so no visible air pocket remains. Do this over a sink or tray, and keep the tubing ends below the water line while you connect them. A properly bled line makes the arms snap back and forth with a crisp, predictable motion.

• Fill syringes while they are submerged to avoid pulling in air.
• Tap the tubing gently to float trapped bubbles toward an open end.

How to keep the tubing and plungers sealed

Leaks usually start at the connection points, not in the middle of the tubing. If a tube is pushed on at an angle, it can feel secure but still seep under pressure. Press each tube straight onto the syringe tip until it stops, then give a gentle tug to confirm it is seated.

Plunger alignment matters too. A plunger that enters at an angle can scrape the syringe wall and let fluid bypass the seal. When you install the syringes in the frame, check that the plunger rod lines up with the direction of travel before you snap anything into place.

• Dry the outside of the syringe tips before connecting tubing so you can spot new leaks.
• If a connection keeps weeping, trim a few millimeters off the tubing and reconnect.

Testing and tuning before the showdown

Once the system is sealed and bled, test it slowly. Push the input plunger in small, even strokes and watch how the output arm moves. You are checking for smooth travel, not speed. If one side moves faster than the other, compare tubing length and look for a partial kink.

After a few slow passes, increase to normal play speed. A well-built hydraulic line should feel firm with no sponginess and no drips at the connections. If it still feels soft, go back to bleeding before you tighten or force anything.

• Test over a tray so any drips are easy to see and clean.
• Recheck tubing routing after every adjustment, since moving one line can pinch another.

Squirrel Showdown hydraulics: build and check steps

1. Fill the syringes underwater: Submerge both syringes and pull water into them while the tips stay below the surface. This prevents air from being drawn in at the start. Mistake to avoid: filling in open air, which traps a bubble before you even connect the tubing.
2. Connect the tubing with no air gap: Join the two syringes with the supplied tubing while the ends remain underwater, then lift the assembly out and check for a continuous water column. Checkpoint: a visible air pocket means you should re-bleed before installing the line.
3. Seat each tube straight onto the syringe tip: Press the tubing on until it stops, keeping it aligned with the tip rather than angled. Give a gentle tug to confirm it will not slide off under pressure. Mistake to avoid: forcing a tube on at an angle, which can feel tight but still seep.
4. Mount the syringes so the plungers travel straight: Install the input and output syringes in the frame and check that each plunger rod lines up with its direction of motion before locking anything down. Checkpoint: a misaligned plunger scrapes the barrel and lets fluid bypass the seal.
5. Bleed any remaining bubbles: Tap the tubing and work the input plunger in slow strokes with one end slightly raised so trapped air can move to an opening. Top off with water as needed. Mistake to avoid: pushing hard to force air through, which can pop a connection loose.
6. Test slowly, then at play speed: Run the arms through several slow cycles and watch for smooth travel and equal response on both sides. Then increase to normal showdown speed. Checkpoint: spongy or delayed motion means air is still in the line, so re-bleed before play.
7. Check for drips after each session: Wipe the connections dry and look for new moisture after play. If a joint weeps, trim the tubing slightly and reconnect it straight. Next step: store the model with the tubing unkinked so the seals are not stressed between sessions.

Parts and extras that support the build

• Nixie Clock - Oscillator: Catalog price is USD 39.98, compared with a catalog comparison price of USD 79.95. A useful reference point if you are budgeting for Hack Pack Toys alongside your Squirrel Showdown build.
• CrunchLabs Logo T-shirt (Black): Available in multiple sizes and described as part of an elite team of creators, artists, scientists, and engineers. A practical option if you want a build-day shirt that survives repeated sessions at the workbench.

Hydraulics reward patience more than force. Fill, seal, bleed, and test slowly, and the Squirrel Showdown arms will respond the way the mechanism was designed to. Once the line is tight and bubble-free, you can stop troubleshooting and get back to the showdown.