MB&F Horological Machine No4 (HM4) Thunderbolt

Timepieces by Swiss Watch brand MB&F are usually referred as horological machines due to their innovative designs and extra-ordinary features. Founded by Maximilian Büsser, MB&F is an artistic and micro engineering concept laboratory in which collectives of independent horological professionals are assembled each year to design and craft radical Horological Machines.

MB&F’s first timepiece, HM1 (Horological Machine No1) was delivered from 2007 and introduced the concept of three-dimensional architectural horology. This was followed by HM2 in 2008 and HM3 in 2009, which were both inspired by science fiction.

This time, the brand presents Horological Machine No4 Thunderbolt, considered by many to be MB&F’s most audacious machine to date.

A traditional wristwatch has a relatively straightforward role: to tell the time. In comparison with a traditional watch, the Horological Machine No4 Thunderbolt has a hand for the hours, another for the minutes and a power reserve indicator. However HM4 Thunderbolt is not just a traditional wristwatch. The aviation-inspired case and engine of the Thunderbolt are one. Neither would, nor could, exist without the other, yet each is so transcendental as to be able to stand alone as a work of art in its own right.

The Thunderbolt’s engine is the culmination of three long years of development. Each of the 300-plus components – including the regulator and even the screws – was developed specifically for this anarchistic calibre. Horizontally configured dual mainspring barrels drive two vertical gear trains, transferring power to the twin pods indicating hours/minutes and power reserve.

But describing HM4’s engine through its mechanical functionality is like describing Renoir’s work through the chemical composition of his paint. Only careful contemplation enables full appreciation, and the sapphire case section and display panels top and bottom allow full access to the flawless fine finishing of HM4’s intricate and vibrant micro-mechanics.

The sleek aerodynamic form of the Thunderbolt’s titanium and sapphire envelope has its roots in Maximilian Büsser’s childhood passion for assembling model plane kits, though none looked remotely as futuristic as this. The striking transparent sapphire section of the case requires over 100 hours of machining and polishing to transform an opaque solid block of crystal into a complex, exquisitely curved panel allowing the light to come in and the beauty of Thunderbolt’s engine to stand out. Every component and form has a technical purpose; nothing is superfluous and every line and curve is in poetic harmony. Articulated lugs ensure supreme comfort. Highly legible time is a fringe benefit.

Horological Machine No4 Thunderbolt is inspired from along childhood passion for assembling model aircraft had Maximilian Büsser’s walls, cupboards and ceiling covered in small aircraft of every description. Planes were what he saw last thing at night and planes were what he saw first thing each morning.

Engine of Horological Machine No4
HM4’s engine was entirely designed and developed by MB&F over three years of intensive work with Laurent Besse and Beranger Reynard of Les Artisans Horlogers. Each of the 311 components were developed specifically for the Thunderbolt, no off-the-shelf mechanisms or parts were used at all due to the extreme nature of its architecture.

Two mainspring barrels connected in parallel provide 72 hours of energy, and they transfer their power to the dual jet-turbine-like indication pods (one displaying the hours and minutes, the other the power reserve) via vertical gear trains.

Visible through a shaped sapphire display panel on the top of the case, a distinctive streamlined cock supports the balance, its centre cut away to reveal as much of the oscillating wheel as possible and validating the “kinetic” in MB&F’s “kinetic art”.

A work of art rewards when viewed from different angles and the Thunderbolt is no exception. Turning the machine over reveals a veritable panorama of meticulously finished micro-engineering through the sapphire sections. In a playful trompe d’oeil, what at first glance appears to be a micro-rotor in the form of MB&F’s iconic battle-axe is actually a bridge.

Indications
For a timepiece not developed specifically to tell the time, HM4 performs that role superbly. In fact, with its highly legible dials perpendicular to the wearer’s wrist, Horological Machine No4 might be described as the perfect pilot’s or driver’s watch.

On the left pod, the amount of fuel in the tanks – or power reserve – is clearly indicated by a skeletonised hand echoing MB&F’s battle-axe motif. On the right, hours and minutes are displayed by bold, arrow-tipped Super-LumiNova filled hands. Each of the two aviation instrument-styled dials is directly controlled by its own crown, one to wind and re-fuel the tanks, the other to set the time, which provides direct and instantaneous feedback of the action performed.

Case
Inspired by aviation, more specifically the model aircraft kits of Maximilian Büsser’s childhood, the case of HM4 imparts speed, power, technology and refinement in equal measure. Visually, the case is composed of three parts: two streamlined jet-turbine-styled pods supported by a horizontal section housing the engine, which is clearly visible through transparent sapphire display panels and the central section of the case itself.

Technically there are also three main sections, but these comprise a fore section in titanium, which includes the dials and articulated front lugs; a central section in sapphire offering unprecedented 360° access to the superbly finished engine; and an aft section tapering down to the dual crowns and framing the animated balance, which is supported by an aerodynamic cock. Methods borrowed from aeronautic engineering are visible in the externally mounted screws, which provide both rigidity and watch resistance to hold the case’s three sections solidly and elegantly together.

Beginning with a solid piece of sapphire, more than 100 hours of intricate machining and meticulous polishing are required to turn an opaque block of crystal into the clear, light-filled atrium of the central case section, which reveals part of the Thunderbolt’s engine and engineering details. The metal case sections are milled from solid blocks of high-tech Grade 5 titanium, which undergoes hundreds of hours of machining before polishing, masking and finally satin-finishing of the surfaces. The results speak for themselves.

The contrasts of matte with highly polished surfaces, titanium with sapphire, straight lines with seductive curves and rigid forms with articulated arms endows Horological Machine No4 with a life and vibrancy that sets it apart from anything that has ever gone before.

Technical details
Engine
Three-dimensional horological engine developed 100% by MB&F
Manual winding with two mainspring barrels in parallel
Power reserve: 72 hours
Balance frequency: 21,600bph/3Hz
Number of components: 311
Number of jewels: 50

Functions
Hours, minutes and power reserve indicator
Hours and minutes on right dial, power reserve indicator on left dial
Separate crowns for time setting and winding

Case
Grade 5 titanium and sapphire
Dimensions: 54mm wide x 52mm long x 24mm high
Number of components: 65
Articulation of lugs: 3°

Sapphire crystals
Five sapphire crystals: 2 x dials, 1 x central case section, 2 x display panels (top and bottom)

Strap
Black hand-stitched calfskin strap with titanium/white gold custom designed deployment buckle attached to articulated lugs

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