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From: david mccandless <daval@iprimus.com.au>
Subject: Re: [FlyRotary] Re: metric system
Date: Mon, 27 Nov 2006 11:39:27 +0800
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>


On 27, Nov , at 7:07 AM, Sandy wrote:

> Let me make sure I have this right.
> Two horse's ass's (how do you spell the plural of ass?) determined the
> diameter of the Space Shuttle booster rockets.  Is that about it?
>
  Ass is another name for a donkey; the word you want is 'arse' and the 
plural of arse is arses
The width of a roman road was determined by the wheel tracks of a roman 
war chariot drawn by two horses side by side. When the railroads were 
developed in England they followed the main arterial roads which were 
originally the roman roads, so the rails were laid on the wheel tracks; 
about 5 feet apart. 19th century rail technology in the US came from 
England so US railroads indirectly were based on roman roads. The space 
shuttle boosters were designed to be transported by rail so the width 
was based on roman two horse chariots.
That is about it, BR, Dave McC