Re: Ancient automation

The Greeks were full of hot air.

They couldn't even invent the wheelbarrow with a knowledge of the lever.

And they didn't bother inventing the windmill to pump Nile water, even
though they used sails on their boats and ships.

All they did was talk talk talk!

Bunch of wankers.





"Seppo Renfors" <Renfors@xxxxxxxxxx> wrote in message
news:430573AC.3F622E8D@xxxxxxxxxxxxx
>
>
> Philip Deitiker wrote:
>>
>> "deowll" <deowll@xxxxxxxxxxxxx> says in
>> news:XjtMe.19347$Rm3.18720@xxxxxxxxxxxxxxxxxxxxxx:
>>
>> >
>> > "Eric Stevens" <eric.stevens@xxxxxxxxx> wrote in message
>> > news:6mf2g11hb3ddtrg2tquslmkse2db4ej78k@xxxxxxxxxx
>> >> On Mon, 15 Aug 2005 19:48:54 -0500, "deowll"
>> >> <deowll@xxxxxxxxxxxxx> wrote:
>> >>
>> >>>Does anyone have a clue when the propeller showed up? I tried a
>> >>>search and hit steam ship and air ship. I know about the
>> >>>feather copter toy that was may have been one of the first uses
>> >>>of this concept but I can't go back further.
>> >>
>> >> The modern form of propellor evolved early in the 19th century
>> >> from various types of screw. In fact, it is still called a
>> >> 'screw propellor'. I don't know how far back the idea of a
>> >> screw goes into history but certainly Leonardo da Vinci
>> >> sketched a screw type of propellor.
>> >>
>> > True but the Wrights were the one that actually came up with the
>> > fact that the blades need to be wings. I'm not sure you could
>> > get of the ground with a toy using the one Leonardo drew.
>>
>> There is an equation which governs fixed wing aircraft. If you take
>> and infinitely durable aircraft with a infinitely powerful engine and
>> you bring it up to top speed,
>
> There is a serious error right there in the beginning. *IF* that
> nonsense was true the speed would also be "infinite" - but then so
> would the DRAG be (that increases by the square of the increase in
> speed) - so in reality it is all an impossibility!
>
> As for the propellor - it CAN be flat bits of (whatever) as long as
> they have a pitch (helix angle) that works - it will be inefficient,
> so much is true but it NEEDS not have camber.
>
> [snip rubbish]
>
> --
> SIR - Philosopher unauthorised
> -----------------------------------------------------------------
> The one who is educated from the wrong books is not educated, he is
> misled.
> -----------------------------------------------------------------



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