CNC Helical Gears for your Raptor
Small pinion : 13 Teeth
Large pinion : 102 Teeth
Final Ratio : 7.85 : 1

Helical gears will withstand higher loading than an equivalent size spur gear; the reason is that when the mid-section of teeth are in contact, the line of contact runs from the outside diameter on one end of the tooth to the root on the other. In consequence the bending moment on the tooth is only a little over half as much as it would be for the entire load on the tip as in spur gears. Thus the load is transferred by sliding action rather than chopping which gives much more silent running than with spur gears and a better wear rate.