I Built a Flail (And Fixed Its Biggest Flaw)

Summary

The video explores whether a flail’s dangerous rebound can be reduced, then builds and tests a custom flail using an inertial “dead-blow” effect.

Main Ideas and Lessons

• The flail’s main drawback is rebound. When its head strikes something, it can bounce back toward the user. The creator demonstrates this problem and notes that shortening the chain may limit it, though doing so compromises the appearance.
• A partially filled head may dampen rebound. The creator tests a mock-up, first empty and then partly filled with steel balls. The filled version feels harder on impact and seems to bounce back less.
• How the damping works: In a partially filled hammer head, the loose, heavy material shifts during the swing. After the outer shell hits and begins to rebound, the filler continues moving and strikes the inside of the opposite end, reducing the rebound.

Building the Flail

• The creator chooses a D20-shaped head and a walnut handle.
• The handle is test-engraved, then engraved on the finished piece.
• Tungsten powder is added to the head to dampen its movement and reduce rattling.
• The chain is bent for a less mass-produced appearance.
• Long rivets are inserted through the head’s lugs to keep it securely attached.
• An end cap is fixed with epoxy and decorative nails, and the handle is wrapped in leather. The overlapping wrap is intended to improve grip and make the handle harder to pull from the user’s hand.
• The handle is colored red for contrast with the brass, and numbers are added to the D20’s faces.

Testing and Conclusions

The creator finds the finished flail’s rebound manageable and attributes this to the damping feature. They also suggest that a chain-based weapon may be more compact and easier to carry than a club of comparable length, while still delivering a powerful blow. They acknowledge that earlier comparisons may not have been ideal and say they want to conduct further tests.

Sponsor Segment

The video includes a promotion for How to Rebuild Civilization, described as an illustrated, encyclopedia-like book covering how things work. The creator praises its technical-drawing and medieval-manuscript-inspired visual style and mentions a discount code.

Speakers and Sources Featured

• Njord Artisan, the video’s creator and narrator: Explains the design, conducts the tests, and builds the flail.
• Rudy: The creator’s assistant, who demonstrates the rebound problem.
• Instructor Ben: Mentioned by the narrator in a question about whether he has used an inertial hammer; not otherwise presented as a speaker.
• Sponsor source: How to Rebuild Civilization, promoted in the sponsor segment.