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From: Radey Shouman <shouman@comcast.net>
Newsgroups: rec.bicycles.tech
Subject: Re: Higher Education Is Overrated
Date: Wed, 11 Dec 2024 16:11:49 -0500
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Jeff Liebermann <jeffl@cruzio.com> writes:

> On Tue, 10 Dec 2024 23:29:03 GMT, cyclintom <cyclintom@yahoo.com>
> wrote:
>
>>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.