ApisQueen U20 Underwater Thruster 50V 20Kg Thrust 1200W For Kayak, unmanned boat, etc.

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Highly qualified full metal construction, precision machining,Made by material aerometal and digital machinery.

Full waterproof technology,Fully encapsulated waterproof, dust-free, grit prevented, anti-corrosive, long last working underwater

High precision baring prolongs the motor life

Best matched power system,Highly strengthened metal propeller, best matched motor, provides most efficiency

Easy assemble,Modularized base, meeting with different field requirement.

U20 use environment: seawater/freshwater

Description of Underwater Propulsion CW and CCW:

Marine propellers are usually classified into two types, left-hand and right-hand, known as CW and CCW, respectively.
CW is an abbreviation for Clockwise, which means a propeller that rotates clockwise, also known as a right-handed propeller.
When a ship's propeller rotates, the leading edge of the propeller blade is on the right and the trailing edge is on the left when
 viewed from the side, driving the water in the same direction as the rotation. A starboard propeller is usually mounted on the
left side of the boat, i.e. port side.
CCW stands for counterclockwise and indicates a propeller that rotates counterclockwise, also known as a left-handed propeller.
When a ship's propeller rotates, the leading edge of the propeller blade is on the left side and the trailing edge is on the right
side when viewed from the side, pushing the water flow in the direction opposite to the direction of rotation. The port propeller
is usually installed on the right side of the boat, i.e. the starboard side of the boat.
Installing the left and right propellers on both sides of the boat balances the propulsion and side thrust, making the boat more
stable and steady.
CW propellers CCW propellers
 produce forward thrust when rotating clockwise
and backward thrust when rotating counterclockwise;
produce forward thrust when rotating counterclockwise
and backward thrust when rotating clockwise;


PWM full name is (Pulse-width modulation). It is also called duty cycle signal, which indicates the proportion of the high level duration to the whole signal period. 2ms for the whole period of PWM, 1.5ms stop, 1.5-2ms forward, 1.5-1ms reverse.

From the diagram, we can clearly see that when PWM is 75% (1.5ms), the motor stops rotating, when PWM is 50% (1ms), the motor rotates in reverse, and when PWM is 100% (2ms) the motor rotates in forward.Of course ESC will not only make the motor turn forward and reverse, but can adjust the speed of motor rotation by the duty cycle size of PWM. When the PWM is gradually changed from 75% to 50%, the motor will keep reversing and accelerating from stop until the reverse rotation reaches the maximum. And when PWM is gradually changed from 75% to 100%, the motor is continuously accelerated from stop to forward until the forward rotation reaches the maximum value. That is, PWM is a signal that can be continuously varied, and the effective range is from 50% to 100%.

The frequency of PWM signal is 50hz, 100hz, 200hz or 500hz, etc. The higher the control frequency, the shorter the period, the shorter the control interval, and the faster the ESC and motor response speed The faster the ESC and motor response. Conversely, the lower the control frequency, the longer the period, the longer the control interval, and the slower the ESC and motor response.

U20 parameter specifications
Model U20
Motor outer diameter 121mm
Voltage 50V(12S)
Maximum current 25A
Maximum thrust 20Kg 
Power 1200W
Weight 2.3Kg
Line length 1米
Plug Specifications 4.0mm
ESC 100A

U20 test parameters
Advance  1.5-2ms Back 1.5-1ms
Voltage Current Thrust Voltage Current Thrust
12V 3.4A 2.1Kg 12V 3.1A 1.8Kg
16V 4.7A 3.1Kg  16V 4.2A 2.6Kg
24V 8.9A 6.2Kg  24V 7.6A 5.3Kg
30V 12A 9.7Kg 30V 11.6A 8Kg
48V 22A 18Kg 48V 22A 16.3Kg
50V 24A 20Kg 50V 21.7A 16.8Kg