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Al Schwartz
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3,404 Posts
The second reference posted above is a handy way to figure out the pitch of an unknown gear. Changing rations on an in-line motor is no problem - it's free choice up to the gear diameter limitations imposed by tire size or ground clearance regs. Sidewinders are another story - scratch built chassis afford the opportunity to change the armature shaft/axle spacing to accomodate the center-to center distance of the gear set but the RTRs do not have this flexibility. Fortunately, Ing. Ferrari of Slot-It ignored conventional wisdom and developed a tooth profile that allows varying the tooth count while maintaining constant diameter spurs and pinions to allow ratio changes - and they are very smooth running sets to boot. They are, however, built for 0.093" axles, not the metric ones common on the RTR cars. (Slot-It also offers in-line sets with constant diameter pinions and matching crown gears offering two variables while maintaining the motor-shaft extension centering function)

EM
 
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