How They Designed the Space Shuttle
How They Designed the Space Shuttle
The
US standard railroad gauge (distance between the rails) is 4 feet, 8.5
inches. That's an exceedingly odd number. Why was that gauge used?
Because that's the way they built them in England, and English expatriates built the US Railroads.
Why did the English build them like that?
Because the first rail lines were built by the same people who built the pre-railroad tramways, and that's the gauge they used.
Why did "they" use that gauge then?
Because
the people who built the tramways used the same jigs and tools that
they used for building wagons, which used that wheel spacing.
Okay! So, why did the wagons have that particular odd wheel spacing?
Okay! So, why did the wagons have that particular odd wheel spacing?
Well,
if they tried to use any other spacing, the wagon wheels would break on
some of the old, long distance roads in England, because that's the
spacing of the wheel ruts.
So, who built those old rutted roads?
Specifications and bureaucracies live forever.
So
the next time you are handed a specification and wonder what horse's
ass came up with it, you may be exactly right, because the Imperial
Roman war chariots were made just wide enough to accommodate the back
ends of two war horses.
Now the twist to the story...
There's an interesting extension to the story about railroad gauges and horses' behinds.
When
we see a Space Shuttle sitting on its launch pad, there are two big
booster rockets attached to the sides of the main fuel tank.
These
are solid rocket boosters, or SRBs. The SRBs are made by Thiokol at
their factory at Utah. The engineers who designed the SRBs might have
preferred to make them a bit fatter, but the SRBs had to be shipped by
train from the factory to the launch site. The railroad line from the
factory happens to run through a tunnel in the mountains. The SRBs had
to fit through that tunnel. The tunnel is slightly wider than the
railroad track, and the railroad track is about as wide as two horses'
behinds.
So, a major design feature of what is arguably
the world's most advanced transportation system was determined over two
thousand years ago by the width of a horse's ass.
Scoutmaster MinuteA PENCIL MAKER TOLD THE PENCIL 5 IMPORTANT LESSONS :
1.) EVERYTHING YOU DO WILL ALWAYS LEAVE A MARK.
2.) YOU CAN ALWAYS CORRECT THE MISTAKES YOU MAKE.
3.) WHAT IS IMPORTANT IS WHAT IS INSIDE OF YOU.
4.) IN LIFE , YOU WILL UNDERGO PAINFUL SHARPENINGS,
WHICH WILL MAKE YOU A BETTER PERSON.
5.) TO BE THE BEST PENCIL, YOU MUST ALLOW YOURSELF
TO BE HELD AND GUIDED BY THE HAND THAT HOLDS YOU.