R-Tune 540 Sensored BL Motor 8.5TArrowmax have introduced the Dash R Tune 540 size sensored competition brushless motor. It features a high airflow design with large cooling openings in the machined aluminium case for improved cooling efficiency and less power fading even when using low turn windings in high ambient temperatures. The redesigned stator further adds to the overall performance, increasing torque and reducing heat build up.