Brief description

A fire piston is a small device that uses rapid air compression to ignite tinder in a sealed cylinder.

Use / Function

• Primary use: Create an ember by compressing air.
• Secondary uses: Reliable ignition in humid climates with good tinder.
• Scale: Individual.

Operating principle

When air is compressed very quickly, its temperature rises sharply. The hot air ignites a tiny piece of tinder placed at the piston tip, creating an ember.

How to create it

1. Make the cylinder: A smooth, straight tube of hardwood, bamboo, or bone.
2. Make the piston: A tight-fitting rod with a seal (leather or plant fiber).
3. Add tinder: Place a small tinder pellet at the piston tip.
4. Compress: Slam the piston quickly into the cylinder.
5. Recover ember: Remove and transfer the ember to a tinder bundle.
6. Technical level: Intermediate.

Materials needed

• Essential: Cylinder, piston, seal, tinder pellet.
• Tools: Knife, scraper, abrasive for smoothing.
• Substitutes: Resin or wax to improve the seal.

Variants and improvements

• Glass or metal cylinder: Durable and smoother, requires higher technology.
• Lubricated seal: Reduces friction and improves air tightness.
• Tinder cup: Small recess to hold tinder securely.

Limits and risks

• Precision required: Poor fit prevents ignition.
• Tinder sensitive: Needs very dry, compact tinder.
• Pinched fingers: Fast compression can injure hands.