Glossary of Terms
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Camber
The angle of the wheels (when looked at from the front or rear of the car) relative to the vertical.  If the wheels lean inwards towards the car, the angle is said to be negative.  If they lean out the angle is positive, however, positive camber is almost never used.  Basically, zero camber gives the maximum forward traction, whilst more negative camber gives more grip while cornering.
Caster
This describes the angle (when looking at the front wheels from the side of the car) between the kingpin and the vertical.  This is part of the car's geometry which keeps it travelling in a straight line when no steering force is applied.  It is not adjustable on all cars.
Crystals
All radio-controlled equipment uses crystals to set the frequency which they operate on.  Crystals resonate at a set frequency when an electric current is passed through them.  They are very delicate and should be stored and handled with great care.
NOTE: Crystals come in pairs, one for the transmitter which is marked 'TX', and one for the reciever which is marked 'RX'.  Make sure you use the correct crystals, it DOES make a difference.
Commutator ('com' for short)
The part of the rotor (the part inside which turns) which has three copper contact for the brushes to run on.  Keep clean and skim regulary for optimal efficiency and motor life.