[Land-speed] British Steam effort 139.843mph

[Dave Dahlgren]

You can go to 20 places past the decimal point and not be accurate though 
you might imply it.
How do the compensate for the length of the wire?
Dave
----- Original Message ----- 
From: "Kirkwood" <saltfever at comcast.net>
To: "land-speed" <land-speed at autox.team.net>
Sent: Wednesday, September 02, 2009 6:02 AM
Subject: [Land-speed] British Steam effort 139.843mph


> To get 1/1000 of any distance per hour, you have to be able to resolve 
> time
> to the 0.000277 seconds. However, fundamental metrology requires at least 
> a
> resolution of 1/10 to the right of the most significant digit to avoid
> rounding errors. So timing resolution must be at  least 0.000027 seconds.
> The Bonneville clocks are better than that and report 7 seven places to 
> the
> right of the decimal!
>
>
>
> From: Malcolm Pittwood <mbp01 at sky.com>
>
> (snip . . . ) "The calcualtion of the average speed . . . . "  All to a
> timed accuracy of 1/1000th of a second and then expressed to 1/1000th of a
> mph or kilo per hour.
> _______________________________________________