Re: Higher Education Is Overrated

On Sat, 14 Dec 2024 22:33:31 GMT, cyclintom <cyclintom@yahoo.com>
wrote:

On Wed Dec 11 16:11:49 2024 Radey Shouman  wrote:

Jeff Liebermann <jeffl@cruzio.com> writes:
 

On Tue, 10 Dec 2024 23:29:03 GMT, cyclintom <cyclintom@yahoo.com>
wrote:
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On Mon Nov 25 13:41:40 2024 Jeff Liebermann  wrote:

On Mon, 25 Nov 2024 19:32:46 GMT, cyclintom <cyclintom@yahoo.com>
wrote:
 

Crossbows had short and consequetly inaccurate arrows.

 
True for long distances.  Not true over short distances.
 
Ever see how the arrow shank flexes and wobbles when shot from a
conventional bow?  Start here and watch it flex:
<https://youtu.be/O7zewtuUM_0?t=46>
With all that flexing, it's a wonder the archer can hit the proverbial
side of a barn.  A crossbow bolt is short, stiff and doesn't flex.
Therefore, it's more accurate.  What a short bolt doesn't have is
range.
<https://www.crossbownation.com/threads/arrows-short-vs-long.115560/>
If you really want accuracy, you use the longest arrow possible.

>

No you don't. There is a sweet spot that is about a normal draw length.

>
The "sweat spot" is mentioned in the YouTube video.  Assuming you
watched the video, it's difficult to miss.  It has to do with
improving the accuracy by calculating the distance when the arrow is
directly in line with the aiming point which compensates for the arrow
flexing around the bow.
>

Long arrows have a lot of wind resistance that causes them to slow
rapidly and the spinning and wiggling of the arrow is much slower
making them run off course.

>
Wind resistance is not a function of weight.  A heavy arrow has
exactly the same wind resistance as a light arrow.  Aerodynamically,
wind resistance is also a function of the cross sectional (frontal)
area of the arrow.  However, if you decide that arrows are shot in a
crosswind, then yes, a longer arrow with be more affected by such a
crosswind.

 
The *effect* of wind resistance does depend on mass.  Suppose you have
two arrows shot at the same speed, one with a higher mass.  Given the
same wind resistance (and the same decelerating force) the more massive
arrow will decelerate more slowly.
 
Suppose the arrows are shot with the same kinetic energy, or with the
same momentum.  In that case the more massive arrow will have a lower
velocity, and hence lower wind resistance.  Again deceleration will be
slower.

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Liebermann has to tell us things that he doesn't know. There is another point - when  you fire an arrow out of a long bow, the back of the arrow accelerates faster than the front of the arrow with a heavy arrow arrowhead on it. This causes the arrow to bend in the center and the the feathers cause the arrow to rotate, the "wobble" of the arrow is quite distinct This rotating and flexing back and forth causes air drag and contary to what Liebermann says causes more air resistance the longer or heavier the arrow is.
>
So the actual RANGE of an arrow is pretty much the same for a heavy bow as a lighter one.
>
Another point might be made about Slocomb and his Archery Act or whatever it was - England INVENTED sports and most of them were played with balls and not long bows. There are records of football dating from the late 1100's. Until betting came in, cards and dice and such weren't much of a game. But Golf was. Temnnis was and Curling was.

The  first recorded use of the word 'foot-ball' in English dates from
1314, when London's mayor prohibited games in the city.

As for laws:
King Henry I, who ruled England from 1100 to 1135, declared that
deaths accidentally caused by practicing archers didn’t count as
murder or manslaughter.

During the reign of Henry III, the 1252 Assize of Arms required that
able-bodied men of a certain means between the ages of 15 and 60 be
equipped with a bow and arrows and know how to use them

Tn 1363, King Edward III,  declared that able-bodied men must practice
archery on holidays.

The Archery Law, enacted that same year, further demanded practice on
Sundays.

Edward also outlawed, on pain of imprisonment, watching or
participating in “vain games of no value,” a wide net that included
handball, football, hurling stones, and cockfighting. 

--
Cheers,

John B.