DaveKillens wrote:
Geez, if you think that's difficult, I remember working on the Canadian version of the T-33 jet trainer. US construction, but RR engine. That meant that for the airframe we used US standards, and for the engine was used British Standard Whitworth.
You know what DK, for hydraulic pipe-theads, Whitworth BSPP/BSPT is still the ISO-standard, to my knowledge mm-threads are only used in Germany for that purpose. NPT is
verboten everywhere though!
The same thing goes for O-ring cross-sections, ISO-recommendation is 2.62/2.65, 3.53/3.55, 5.30/5.33 and 6.99/7.00, which is of course stemming from inches somehow. Again, Germans an Austrians prefer even mm, like 3.0, 4.0 and 5.0,
I remember when I was Design manager for an Austrian-owned machinebuilding company in Pennsylvania, what a mess!
For the record Jon, the French also had this idea about a ten-day week, how about that?