TECHNICITY AT THE SERVICE OF ADVENTURE
RM 25-01 TOURBILLON CHRONOGRAPH ADVENTURE
COMPETITION CHRONOGRAPH MOVEMENT
Richard Mille engineers spent several months of work and research reducing the weight and optimising the calibre, especially the precision of time calculation over the long term.
This has given rise to many innovations, such as the design and manufacturing of several titanium parts, like the levers, which reduce inertia and thus lower energy consumption by 50%. This made it possible to significantly alleviate friction on the axis and eliminate jumps and twitches of the chronograph hand during start or stop of the timer.
This indicator supplies information about the mainspring’s tension, thus permitting an optimisation of the movement’s chronometric functioning. Below 5.3 N.mm, the spring is considered too slack, while above 6.5 N.mm, excess tension in the spring can adversely affect the mechanism’s operation, or actually endanger it.
The power-reserve indicator shows the number of hours of energy left in the mainspring before the watch must be wound again.
Movement dimensions: 38.95 mm
Thickness: 8.37 mm
Tourbillon diameter: 12.30 mm
Balance wheel diameter: 10.00 mm
Number of jewels: 35
Balance wheel: Glucydur®, with 2 arms and 4 setting screws
Moment of inertia: 11.50 mg.cm2, angle of lift 53°
Frequency: 21,600 vph (3 Hz)
Balance spring: elinvar by Nivarox®
Shock protection: KIF ELASTOR KE 160 B28
Central bridge in titanium
Barrel shaft: nickel-free Chronifer® (DIN x 46 Cr 13 + S), with the following characteristics: stainless – antimagnetic – suitable for tempering
The compass consists of a fixed bezel and a rotating bezel, both crafted in DLC-treated grade 5 titanium, with sapphire glass. It attaches to the case with a bayonet mount. Its cover is made of Carbon TPT®, and includes a mirror with an opening at 12 o’clock that permits greater precision when orientating with the compass needle.
Once removed, the compass can be affixed to a Carbon TPT® baseplate. Ideal for orientation, this arrangement provides a number of indications, including engraved lines showing the direction to head in when following a course with a map.
BIDIRECTIONAL DAYTIME BEZEL
The titanium bezel can be exchanged for a ‘daytime’ bezel should the owner so desire.
This second bezel, in Carbon TPT® and grade 5 titanium, possesses marks for the four cardinal directions in addition to a 360° graduated disk and a 24-hour scale.
The spirit level contained within a titanium bubble makes it possible to hold the watch exactly horizontal to improve accuracy when sighting with the compass needle.
WATER RESISTANT COMPARTMENT
This module, in grade 5 titanium, is hermetically sealed to stash water purification tablets that can make any source of water safe to drink.