Page 11 - Demo

10With an ESC driven Outrunner E motor. Increasing the throttle sets the RPM the motor will run at and The ESCsupplies the necessary current. Hence if you increase the propeller drag at any RPM. The current draw will increase to compensate until overload. Not the RPMdrop off to compensate as in an IC.2A20A30A12A Smaller current* from battery* Low RPM High Torque * High current* from battery* High RPM High Torque * High current* from battery* High RPM High Torque *Excess heat generated * in engine and ESC High current* from battery* Low RPM High Torque *Excess heat generated * in engine and ESCWith an E (Out-runner Electric) engine, speed control is achieved by an ESC(Electronic Speed Controller) which effectively, through some complex electronics sets the RPM the engine runs at. To achieve this RPM the full power of the battery is available. Even at low RPM.An E engine set at low speed tells the ESC to achieve a low RPM and automatically supplies sufficient current to balance the propeller drag.With an E (Out-runner Electric) engine set at a high speed setting. The ESC(Electronic Speed Controller) sets a high RPM and automatically supplies sufficient current to balance the higher propeller drag.If we increase the propeller size at high RPM. The ESC will set the same high RPM and automatically supply sufficient current to balance the larger propeller drag.If we take an E engine back to low speed, with the bigger propeller. The ESCwill set the same low RPM and automatically supply increased current to balance the larger propeller drag.Battery capacity 40A at 12V=480 Watts energy availableBattery capacity 40A at 12V=480 Watts energy availableBattery capacity 40A at 12V=480 Watts energy availableBattery capacity 40A at 12V=480 Watts energy availableESCESCESCESCAvailable TorqueAvailable TorqueAvailable TorqueAvailable TorqueRPM 2,800RPM 16,800RPM 16,800RPM 2800You need to match the ESC and motor to the propeller drag requirements. Oversizing propellers for a given capacity motor/ESC combination will quickly overheat and destroy them. There are several programs available to calculate all this and most motors have published propeller and ESC data available so its not difficult to achieve.There is lots of information on selecting the correct propeller / motor / ESC for any model, available. so setting up an E model or converting from IC is easily achieved. You just need to keep the above in mind if you are playing around with propellers on a model to optimize a specific performance characteristic. As a safety measure I prefer to use a separate receiver supply and Fuse the ESC supply to protect against accidental overload.78th Model Flying New ZealandNATIONALSHawkes BayJan. 4th - 8th2026whynot give it a go