One of the biggest challenges facing Oris engineers was the design of the altimeter hand itself. Making the altimeter mechanism small enough to fit inside a wristwatch meant the hand had to be extremely lightweight, but stiff enough to avoid tolerances and therefore inaccurate readings.
Green is the Sellita automatic calibre and blue the mechanical altimeter. You can also clearly see the clever construction of the altimeter hand…
The altimeter mechanism developed together with the Swiss specialist Thommen
The solution was to create it from laminated carbon fibre, making the hand seven times lighter, but 10 times stiffer than the average watch hand.
Laminated carbon fibre, making the hand seven times lighter, but 10 times stiffer than the average watch hand…
Another challenge was how to protect the inner workings of the watch from moisture when the altimeter is activated. Oris patented a new altimeter adjustment and venting crown, which prevents moisture from entering the watch using a membrane made of PTFE (a material like GoreTex), which creates a vapour barrier.
>>> On page 3 you will find more exciting pictures and technical details about the Oris Big Crown ProPilot Altimeter >>>