- Brushless system has a higher efficiency and more powerful setup compare to the conventional brushed power system. However, most Ready-to-Fly/ Ready-to-Run kits are supplied with all-in-one system, which may have receiver, brushed motor speed controller (ESC), gyro and signal-mixing board integrated in one piece device, such as the 4-in-1 board on LAMA helicopter and some RC racing toy boats. The all-in-one board becomes a challenge for those modelers who wish to upgrade their existing brushed motor system.