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C. Spin
Although spin is one of the most important factors of a
robot, you'll find that most robots do a decent job. When choosing what
robots suits you, you should consider the following:
1. Amount of spin
Can you robot you choose generate sufficient spin to allow you to practice
the strokes/routines that you're interested in? The single wheel robots can
only generate heavy spin at higher speeds, so if it's essential to you to be
able to generate heavy spin at slow speed, then a 2-wheel head may be
essential.
2. Types of spin
Well virtually all robots can generate topspin and backspin, but the
variations
of sidespin is not the same for all. Most robots generate sidespin by rotating the head
to an angles so that the topspin or backspin turns into sidespin. Many
robots can only turn the head to
 45 degrees
(see picture on right), which means you cannot generate
pure sidespin (also commonly referred to as corkscrew spin).
This type of
spin is not actually very common in real play, as combinations of
topspin-sidespin or backspin-sidespin are usually used, but if pure sidespin
is important to you, make sure your robot can generate it.
Continue on to
Robots - Practical
considerations (ease of use, power, portability, reliability) | 
