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Darts
"Tuning"
Darts
tuning is meant to determine a setup for your darts that fits
your throw. When I am talking about setup I mean the flight/shaft
system of the dart. This system is responsible for the aerodynamic
behavior of your darts. It must meet the requirements of darts
physics (see the technics section for a closer look at this).
The main parameter for determining the correct flight/shaft
system for you is the angle at which the dart sticks in the
board. Unfortunately you can only see this angle when you are
playing on a steel tip board. If you are playing only soft tip
then you should switch to a steel board for darts tuning. 
The
correct angle is within 10 to 60 degrees. Just like in the picture
above. The more consistent this angle is, the better. For instance,
if every dart of your 3 dart series sticks in a different angle
then something is wrong. Most likely does your dart wobble considerably,
which can only be reduced by serious practicing. However, using
a bigger flight shape will also help here as it adds stability.
Generally,
bigger flights ("standard" shape or bigger) will give
a greater angle, while smaller flights (such as "pear"
shape) will give smaller angles. Note that when you are doing
darts tuning always use the same shaft for comparison between
flight shapes. Shaft length and shaft material have a strong
effect on the flight/shaft system.
Also
note that shaft weight (or even flight weight!) also have influence
on this angle. The heavier the shaft or flight is, the smaller
the angle will be. This is important when you decide whether
you will use nylon or the heavier aluminum or titan shafts.
The shaft rings can also influence this, as they make the shaft
heavier.
Darts tuning needs work and patience. It should be done over
a couple of days to eliminate possible daily variances in your
throw. A good starting setup for darts tuning is middle length
nylon shafts with "standard" size flights. From this
initial setup you can continue working, depending on whether
your angle is too big or too small.
Spinning
or non-spinning throw?
Spinning
means that your dart rotates (spins) when you throw it. Some
players that have noticed this spin are concerned whether this
is okay or a bad thing.
I
don't think that spin is a bad thing. It is an additional source
for errors, as it is an additional movement, but on the other
hand spin also adds stability. In my point of view these two
things eliminate each other, so there is no use worrying about
it. In no case should you try to consciously make your darts
spin or consciously try to eliminate spin.
Spinning
has nothing to do with darts tuning. It is not determined or
influenced by the flight/shaft system. It is determined by your
personal throw.
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