Pneumatic cable-pull system that yanks performers horizontally at high speed – creates violent impact reactions for gunshots, punches, or force throws.
What is an Air Ratchet?
An Air Ratchet is a pneumatic cable pull system that yanks stunt performers at high speed in one direction. It simulates the force of impacts – gunshots, explosions, punches, or supernatural forces that send someone flying.
Principle of Operation
| Component | Function |
|---|---|
| Pneumatic Cylinder | Generates rapid linear motion |
| Steel Cable | Connects cylinder to performer |
| Harness | Hidden rig on the performer |
| Pulleys | Control pull direction |
| Quick Release Valve | Instantaneous activation |
Technical Specifications (Typical)
| Parameter | Value |
|---|---|
| Pressure | 8–15 bar |
| Stroke Length | 1–3 meters |
| Speed | Up to 20 m/s |
| Tension Force | 500–2000 N |
| Activation Time | 10–30 ms |
Difference: Air Ratchet vs. Air Ram
| Aspect | Air Ratchet | Air Ram |
|---|---|---|
| Direction | Horizontal/diagonal | Vertical upwards |
| Mechanism | Cable pull | Piston/platform |
| Movement | Pulling | Launching |
| Typical Effect | Gunshot impact | Explosion |
Applications
| Effect | Description |
|---|---|
| Gunshot Reaction | Hit throws performer back |
| Punch/Kick | Combat impact |
| Force Push | Supernatural throw |
| Explosion Hit | Blast wave impact |
| Car Hit | Vehicle impact |
Safety
| Measure | Description |
|---|---|
| Hidden Harness | Concealed under costume |
| Padding | Body protection for performer |
| Landing Zone | Mats, airbags, crash pads |
| Cable Check | Before each take |
| Rehearsals | Gradual increase |
| Stunt Coordinator | Oversees everything |
Typical Workflow
| Phase | Activity |
|---|---|
| Rigging | Set up system, tension cable |
| Harness Fitting | Dress performer |
| Cable Routing | Position pulleys |
| Pressure Test | Start slowly |
| Rehearsal | Without camera, low pressure |
| Gradual Increase | Step-by-step full effect |
| Shoot | With camera, final pressure |
Combination with Other Effects
| Combination | Effect |
|---|---|
| + Squib | Blood effect on hit |
| + Pyro | Explosion timing |
| + Breakaway | Shattering glass/wall |
| + CGI | Muzzle flash, enhancement |
Harness Types
| Type | Usage |
|---|---|
| Full Body | Maximum control |
| Hip Harness | Hidden under clothing |
| Chest Harness | For backward pull |
| Single Point | Quick changes |
Ratchet vs. Cable Descent
| System | Function |
|---|---|
| Ratchet | Fast, hard pull |
| Cable Descent | Controlled fall |
| Fan Descent | Slow fall |
Cost (approx.)
| Item | Price |
|---|---|
| System Rental/Day | €400–€1,000 |
| Stunt Performer | €500–€1,500/day |
| Stunt Coordinator | €800–€2,000/day |
| Safety/Rigging | Variable |
Typical Problems
| Problem | Solution |
|---|---|
| Cable Visible | Camera angle, CGI removal |
| Harness Visible | Costume adjustment |
| Too Harsh | Reduce pressure |
| Unconvincing | Performer training |
Today
Air ratchets are standard equipment for action productions worldwide. They provide the physical conviction that CGI cannot fully replace – when a body truly flies, you see the difference.
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