Firstly , you put this in the wrong Topic section !
I seem to recall doing some tests with my brother about the efficiency of 2 , 3 and 4 blades ........... The higher the torque , speed . 4 blades worked out the most efficient. The smaller the motor less blades as resistance is less.
Payload is the buoyancy less weight to make it neutral in other words the 20 kilos of weight needed to make it neutral.
The easier the water Flows THROUGH the vehicle is better for Commercial use for one main reason which is accessibilty to units for replacement or service which means less downtime. An Enclosed ROV .... meaning an ROV which is 'Streamline' .......... If every 'Chunk' / 'Block' / Edge is smoothed over to get less resistance usually involves extra Covers to make it so. or the buoyancy shaped around the main frame. Bloody time consuming and easy to crack or weak points.............. Fibreglass or Plastic moulded sheeting ..... No difference !
You say 20 amps but what size Shaft are you using ? What Voltage is supplied to the motor , what length of Umbilical are you intending the ROV to pull , what depth rating ? Send me a PM . I'm interested to know.
I seem to recall doing some tests with my brother about the efficiency of 2 , 3 and 4 blades ........... The higher the torque , speed . 4 blades worked out the most efficient. The smaller the motor less blades as resistance is less.
Payload is the buoyancy less weight to make it neutral in other words the 20 kilos of weight needed to make it neutral.
The easier the water Flows THROUGH the vehicle is better for Commercial use for one main reason which is accessibilty to units for replacement or service which means less downtime. An Enclosed ROV .... meaning an ROV which is 'Streamline' .......... If every 'Chunk' / 'Block' / Edge is smoothed over to get less resistance usually involves extra Covers to make it so. or the buoyancy shaped around the main frame. Bloody time consuming and easy to crack or weak points.............. Fibreglass or Plastic moulded sheeting ..... No difference !
You say 20 amps but what size Shaft are you using ? What Voltage is supplied to the motor , what length of Umbilical are you intending the ROV to pull , what depth rating ? Send me a PM . I'm interested to know.