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  • 01 intro
  • 02 about
  • 03 insight
  • 04 video
  • 05 specifications
  • 06 Variations
Historical pieces

C3H5N3O9

C3H5N3O9 (the chemical formula of Nitroglycerine) is a platform created by Felix Baumgartner, Maximilian Büsser, Martin Frei and Serge Kriknoff to experiment with concepts, ideas and creations without the inherent constraints of a luxury brand.

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About

Nitroglycerine watch Urwerk

At first glance the time appears to be indicated by centrally rotating triangular rotors; however, the triangles are actually Reuleaux polygons; they rotate eccentrically rather than centrally and track complex epitrochroid curves rather than circles. The system was inspired by the Wankel engine, which features orbital Reuleaux polygon rotors rather than the reciprocating pistons that power the majority of our cars and machines today.

Insights

The case

The case is made of Zirconium which is highly resistant to corrosion. This material is rarely used in watchmaking due to the extreme requirements involved in machining this high-risk material.

The curves

The Reuleaux polygon rotors tracing epitrochoid curves create the complex shape of the hour and minute curves with high precision required the plotting of 180 separate points.

The indications

Hours and minutes are indicated with two Wankel engine-inspired eccentric rotating Reuleaux polygons : hours by the lower rotor along the front of the 'dial', minutes by the smaller upper rotor.

Video

Specifications

Swiss timepiece, Special Project watch
  • Case

    Case in
    Zirconium or Black Zirconium
    Diameter
    55mm x 44mm
    Glasses
    Sapphire crystal with anti-reflective treatment
    Water resistance
    Pressure tested to 3 ATM
  • Movement

    Calibre
    Manual winding
    Power reserve
    39 hours
    Frequency
    4Hz
    Jewels
    42
  • Indications

    Indications
    Hours and minutes indicated by two Wankel engine-inspired / Reuleaux polygon rotors tracing epitrochoid curves / Power reserve indicator at the back
  • Controls

    Controls
    Two-position winding crown

Variations

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