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Edwards air show B-1 speed record attempt



 
 
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  #55  
Old October 24th 03, 04:59 AM
phil hunt
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On Thu, 23 Oct 2003 12:46:36 -0700, Tarver Engineering wrote:

Which gallon US or Imperial ?


Either would do; in my figures below i was using Imperial gallons
(because I know how big they are).


Why not "pounds", like an aircraft?


Pounds aren't as unit of volume.

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people who openly support the RIAA" -- comment on Wikipedia
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  #56  
Old October 24th 03, 05:05 AM
phil hunt
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On Fri, 24 Oct 2003 00:08:31 -0000, Jim Battista wrote:

Not you that's stupid, the system. It's broken at a basic level --
you should never have to remember anything, which requires 1 to 1 to
1 conversions.


It would certainly be possible to have the baisc unit of length 10
cm, the unit of volume that length cubed, and thre unit of mass that
volume of water.

Meters lead to liters lead to grams lead to calories
and newtons, all based rigidly off a better-defined meter.


Power and force have a dimensionality that includes time, and i'm
not sure how to define a time unit based on the length-unit. If you
used the amount of time it takes light to travel the length-unit,
you'll have a very small time period. Perhaps you could use the
frequency of a pendulum (under earth gravity) of one length-unit
long. Or define the acceleration due to gravity as one length-unit
per time-unit squared.

--
"It's easier to find people online who openly support the KKK than
people who openly support the RIAA" -- comment on Wikipedia
(Email: , but first subtract 275 and reverse
the last two letters).


  #58  
Old October 24th 03, 05:24 AM
Harry Andreas
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In article , Peter Kemp
peter_n_kempathotmaildotcom@ wrote:

Especially living in the US as I currently do, it drives me nuts to
work in mm, inches and U just to get a single box to fit a rack.

Whoever thought of U as a unit of measurement really needs to suffer
in a major way. The sooner racks become standardised on a metric
measurement, the happier I'll be.


Hate to break it to you, but the U is a metric spec.

--
Harry Andreas
Engineering raconteur
  #59  
Old October 24th 03, 05:26 AM
Gene Nygaard
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On Thu, 23 Oct 2003 12:46:36 -0700, "Tarver Engineering"
wrote:


"phil hunt" wrote in message
...
On Thu, 23 Oct 2003 10:57:24 , Keith Willshaw

wrote:

"phil hunt" wrote in message
...
On Wed, 22 Oct 2003 21:54:13 , Keith Willshaw
wrote:

The SI system is simplicity itself

A cu metre of water masses 1 Kg - simple

A Kelvin gram? What's that?

FYI, 1 m^3 of water has a mass of 1 Mg or 1000 kg or 1 t.

Now the non SI units are the bloody nightmare with
pint , gallon and barrel meaning different things in
the UK and USA

Indeed. And even if you know which you're using, working things out
is still hard. Try these sums:

What's the capacity, in litres, of a box 10 cm by 20 cm by 30 cm?

What's the capacity, in gallons, of a box 10 inches by 20 inches by
30 inches?

Which gallon US or Imperial ?


Either would do; in my figures below i was using Imperial gallons
(because I know how big they are).


Why not "pounds", like an aircraft?


Because there are too many engineers too stupid to understand the
simple fact that those pounds are, by definition, units of mass
exactly equal to 0.45359237 kg.

Of course, there are also the rocket scientists and engineers who are
able to get specific impulse in "seconds," by blithely ignoring the
fact that they are canceling out two units that aren't the same thing,
even if they are both called pounds. While seconds are a base unit in
SI, those "seconds" are not the SI units of specific impulse.
Specific impulse in SI is in units of N·s/kg, or the equivalent m/s.


Gene Nygaard
Time flies like an arrow;
fruit flies like a banana.
 




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