Nyt ur - "Nu med rem"

[hannover_dk]

Ja det er svært ikke at ha respekt for uret -trods - også ja - mange krav var faktisk konservative. De oprindelige, og gennemførte krav til Speedmaster fra Nasa var - i den leverede form (altså allerede i tidligt/midt tresserne):

Her er fra nettet, (findes i flere former) testen som i midt tresserne blev gennemført mellem Datona, Speedmaster og Longines Wittnauer (Amerikansk Longines - resultaterne findes nederst:

Watchs in test:Longines, Omega and Rolex (Omega movement : Omega 321 , Rolex movement : Valjoux 72 , Longines : Longines 13 ZN)

High temperature: 48 hours at 71º C followed by 30 minutes at 93º C. This under a pressure of 0,35atm and relative humidity not over 15%.

Low temperature: Four hours at -18º C.

Temperature-pressure: 0,000001atm and temperature raised to 71º C. Temperature then lowered to -18º C in 45 minutes and again raised to 71º C in 45 minutes. This cycle was repeated fifteen times.

Relative humidity: 240 hours in relative humidity of at least 95% and at temperatures varying between 20º C and 71º C. The steam had a pH value of between 6,5 and 7,5.

Oxygen atmosphere: Exposure to 100% oxygen atmosphere at a pressure of 0,35atm and a temperature of 71º C for 48 hours.

Shock: Six 11 millisecond shocks of 40g each in six different directions.

Acceleration: Linear acceleration from 1g to 7,25g within 333 seconds.

Decompression: 90 minutes in a vaccum of 0 10-6 atm and a temperature of 71º C and 30 minutes in the same vaccum but at a temperature of 93ºC.

High pressure: Exposure to 1,6atm for one hour.

Vibration: Three cycles of 30 minutes (lateral, horizontal and vertical), the frequency varying from 5 to 2000cps and back to 5cps in 15 minutes. Average acceleration per impulse 8,8g.

Acoustic noise: 130dB over a frequency range from 40 to 10000Hz for 30 minutes

Results of the tests :

Omega Speedmaster : gained 21 minutes during decompression test and lost 15 minutes during the acceleration test , the luminescence of the dial was lost during the test

Rolex Daytona : stopped running on two occasions during the relative humidity test and during the high pressure test when the sweep second hand wraped and press against the other hands

Longine Wittnauer : Crystal wraped and disengaged during the high pressure test , same fault occured during the decompression test

Final conclusion : the Omega chronograph performmed satisfactorily

In 1965, NASA chose the Omega Speedmaster Professional as the official chronograph for the space program.

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