April Propwash 2018 web.pub

4. Motor, ESC, and Battery temperatures were recorded before each test run and tests were run using consistent temperatures of +/- 2 degrees in most cases. 5. Temperatures were taken on the motor end bells, ESC power board, and battery end near the wires. I used the same locations for each test. 6. Each engine pull was 6-7 seconds. 7. Data (AMPS, VOLTAGE, RPMS, etc.), was recorded based on a 5-second sample of data, taking the average across that time span. 8. Motors tested were as follows: AQ1800 – AQUACRAFT AQ2030 – AQUACRAFT DYNM1500 - DYNAMITE/ProBoat DYNM1800 - DYNAMITE/ProBoat DYNM2000 - DYNAMITE/ProBoat LBP3650-1840 – LEOPARD LBP3660-1900 – LEOPARD NEU1410-2Y - NEU Motors SSS3650-1500 – TFL SSS3650-1968 – TFL SSS3660-1500 – TFL SSS3660-1800 – TFL SSS3660-1968 – TFL TP3650-1950 - TP Power TP3660-1950 - TP Power TURNIGY SK3 3659-1900 - TURNIGY Author’s Note: The P limited classes have been a great introduction to electric racing. They make it easy for beginners to pick from well proven equipment and build fun racing boats at a reasonable cost. Limiting battery voltage alone encourages high cost, high current motors. The unlimited P boats probably have 3 or more times the power of the limited boats. By limiting the motor, the limited classes provide great racing with limited electric experience. The tested P limited motors have around 1.6 output hp at 20,000 t0 23,000 rpm. As a contrast the OS 3.5 outboard has 1.28 hp at 25,000 rpm. However, some of the originally specified motors are being discontinued. What is the direction the class rules should take? Darin Jordan did an extensive series of tests to research this issue. Below is an edited and shortened version of this series. If you want the full story, his posts are on the Offshore Electric forum. I tried to preserve Darin’s opinions on the subject. Lohring Miller Let the Testing Begin: First a quick note on the test setup parameters: 1. Two 4S packs were used, both ThunderPower 70C 5000mAh 4S cells 2. Batteries were charged before testing each motor, with voltage verified and recorded for each pack, and each cell in the pack, using a Hyperion Battery checker. 3. ESC used was a Castle Edge100, with 5-degrees of timing, and with water cooling installed. PROPWASH April 2018 Page 19 P Limited Motor Tests By Darin Jordan By Lohring Miller NAMBA Safety Chairman