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why is the US not Metric
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CatalinaWOW:
Any change on an aircraft requires a change to the type certificate which in turn requires approval from the approving agencies.  Which can mean rerunning all of the ground and flight testing to make sure they won't fall out of the air.  While this can be done by analysis both companies and agencies are reluctant to do that for liability reasons.  The upshot is that the aviation industry is very cautious about change.  Most passengers and pilots like it that way.

There have been a number of cases where an apparently innocuous change to a minor part or fastener has had embarrassing consequences.  Those in the industry are loath to add to the list of anecdotes.

All of this has nothing to do with the supremacy of a measurement system.  It is just the consequence of history and risk aversion.
SilverSolder:

I guess the longer term future will be determined by whether the Chinese air industry will use metric or imperial?
bsfeechannel:

--- Quote from: KL27x on November 27, 2019, 01:59:39 am ---Maybe it IS the Free Masons?

--- End quote ---

Nope. Look at their square.



It's graduated like a millimetric ruler:



Each long mark is separated by four shorter ones. So, I'm afraid even Free Masons have gone metric.

I think the real culprit is Abe Simpson.



CatalinaWOW:
China will become important in the air industry, as they have in virtually everything else.  But the Chinese are very pragmatic.  They will use whichever system gets them to their goals fastest and easiest.  So if qualification costs for new metric hardware (along with all of the associated worldwide inventorying etc.) are daunting the will stick with existing standards.  If they want to create a protected domain for Chinese industry they might just use traditional Chinese units, or non-standard metric sizes, just as they have ignored world standards in several other areas to isolate their market from the world.  Or if they see an advantage to them in going

Your crystal ball is as good as mine as to what their goals are.
CatalinaWOW:

--- Quote from: bsfeechannel on November 27, 2019, 04:48:18 am ---
--- Quote from: KL27x on November 27, 2019, 01:59:39 am ---Maybe it IS the Free Masons?

--- End quote ---

Nope. Look at their square.



It's graduated like a millimetric ruler:



Each long mark is separated by four shorter ones. So, I'm afraid even Free Masons have gone metric.

I think the real culprit is Abe Simpson.



--- End quote ---

How you make the Freemason square that you posted look like metric is beyond me.  There are certainly not four short marks between the long ones.  Nor does it match a fractional ruler where ever shorter marks apply for each halving.  This is what happens when you look to artists for quantitative support for your arguments.
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