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DIY Underwater Scooter Build and Testing
0:00:04 Primary Material: The project utilizes an 82mm x 2.5mm PVC pipe as the main building material.
0:01:02 Shaping the PVC: The PVC pipe is cut, notched, and heated to make it pliable for molding into the desired shape. A smaller piece of pipe is used to form a hatch.
0:01:38 Flattening: The PVC is heated and pressed to be flattened.
0:02:16 Motor Specs: A Flipsky waterproof 3542 brushless DC motor, rated at 230W and up to 48V, is used to power the scooter.
0:04:04 Initial Test Failure: The first thruster test fails because the water flow is in the wrong direction, despite the propeller rotating correctly.
0:04:40 Problem Identification: The propeller was slipping due to inadequate securing, and the tapered exhaust caused backward water flow at high RPMs.
0:04:52 Problem Resolution: The propeller was secured with stainless steel nuts and a shaft nut. The tapered exhaust was removed.
0:05:29 Successful Test: After removing the tapered exhaust, the thruster operates correctly, achieving a maximum power of 750W (1 horsepower).
0:06:26 Battery Pack Construction: A 36V 7.5Ah battery pack is built using old battery cells (3 in parallel, 10 in series).
0:08:57 Motor Controller: A Flipsky FSESC Mini is chosen as the motor controller due to its compact size and sufficient power. A cheaper ESC was tested but provided significantly less power (250-300W).
0:10:01 Controller Housing: Contains the changes to ESC, bluetooth module, and Servo tester.
0:10:36 Handle Construction: The handle is made from PVC pipe, reinforced with multiple layers for strength.
0:17:49 Water Intrusion: Water entered the controller housing through the potentiometer, causing the servo tester to malfunction. The controller itself was not damaged.
0:18:10 Controller Modification: The ESC pulse positioning modulation (PPM) input is replaced with an analog-to-digital converter (ADC) to improve performance.
0:18:41 Ramp-Up Time Adjustment: The controller's ramp-up time is increased to 14 seconds to delay power delivery.
0:19:03 Improved Performance: After modification, the scooter's performance is significantly improved.
0:19:49 Battery Overheating: The battery pack becomes warm during use, indicating that it is struggling to supply sufficient power to the motor.