Team Orion Vortex Pro tuning armatures
To be able to perfectly fine tune your Vortex Pro Brushless motor Team Orion’s international racing team have developed new tuning armatures. With different inner and outer diameters, and therefore different magnetic field strengths, they allow the motor to be adjusted in its acceleration and top speed characteristics. Six new armatures are now available for the 2010 Vortex Pro motors and the Swiss company have provided a handy tech chart to help you choose the right armature for your application and needs.
Source: Team Orion [teamorion.com]