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Archive for the ‘NQD 20mm Jet Drives’ Category

I'm lowering the top BTW

The engineering in the boat the cooling fan circulates air blowing it out between the motors. This wee fan moves lots of air on 7.4 Volts

Arduino Inputs from RX

Ch3   Throttle                       Arduino pin 4
Ch1   Steering                       Arduino pin 5
Ch5   Throttle limit                Arduino pin 6
Ch2   Steering on Throttle       Arduino pin 7

Arduino analogue inputs

Anin 0  Ambient temp sensor                      Anin 1  Hall effect current sensor

Arduino outputs

Pin 8    Left jet
Pin 9    Right jet
Pin 10  Cooling fan speed
Pin 11  Steering

Mixing of the outputs

  int SterringOnThrottle = (long)map((int)ch4v, 1500, 1100, 0, 1000); 
  if(SterringOnThrottle < 0) SterringOnThrottle = 0;
  SteeringBias = (long)map((int)ch3v - (int)ch3vWOZ, 0, 1000, 0, SterringOnThrottle); 
  int SteeringAngle = (long)map((int)ch3v, 1100, 1900, 1000, 2000);
  //Limit fan speed for 11.1 V
  FanSpeed = map(FanSpeed, 1100, 1900, 1000, 1500);
  //Update the outputs
  Servo1.writeMicroseconds((int)Throttle - (int)SteeringBias);
  Servo2.writeMicroseconds((int)Throttle + (int)SteeringBias);

The cooling system

The fan is a 27 mm EDF should keep the air moving with a 10A ESC

There is a big heatsink and fan on the 30 AMp ESC's


Scratch built 30 mm Jet Pump Area Ratio 2.8:1

jet pump, NQD 20mm Jet Drives, scratch built jet, water jet Commenti disabilitati su Scratch built 30 mm Jet Pump Area Ratio 2.8:1 

Development continues on the bigger jet for Yellow Boat 3 short tank test shows peak 27 amps didn't measure the thrust but it was lots, nearly emptied one end of the bath. Should be interesting to run it on the water will be building yellow boat 3 soon

Turnigy 450 H2218 Brushless outrunner 2100KV

This motor is specifically designed for the 450 helicopter range and a perfect fit for any of our HK450 helicopters.

Model: 2218 
Turns: 6
Cells: 2~4S
Kv: 2100rpm/V
No load Current: 1.9A/10V
Max power: 500W
Weight: 67g
Shaft diameter: 3.17mm
Dimensions: 27.2 x 36.5mm
Recomended ESC: 2~4S/50A

Moulded my own Jet 30 mm Reduction ratio 2.8:1 maintained the same are reduction ratio as the NQD jet and turned down a 35 mm prop for an impeller.
Its metal loaded car filler and one layer of woven roving glass fiber. have a bearing mounted in a brass stator which I will locate with. the wear ring will be part of the nozzel housing, so it will be a duct and pump design like some jet skis 

The 28-mm-JET is currently the smallest of the SWEEPER JET SERIES. He achieved at a speed of 13,000 - kp 4-20000 rev / min has a thrust of 2.5. Measurements of power and road tests of the Johnson-700-neodymium motor was at 12 - 14 cells thanks to its power output a favorite of light boats with jet propulsion. For boats with double / triple-jet propulsion is usually the 12-volt version or the Johnson-800 with 14 - 20 cells cheaper. As a rough guide to determine the size and the number of jets should correspond to the weight of the thrust of the boat. 
As an example: 6 kg boat = 2 x 28-mm-JET or 1 x 33-mm-JET. The operating speeds should be between 15,000 - below 20,000 U / min. 
The power consumption is approximately equal to that of a 42 to 45 mm propeller pitch 1.5.

Drop In Jet Module

The idea with the NQD Jet Module is to integrate steering servo, motor, jet pump and ESC into a single drop in module for Yellow Boat 2

Module ESC and transmitter mounted on a dummy transom

The aluminium mount acts as a water cooled heat sink for the ESC

NQD jet assembly integrating steering ESC motor and jet pump is a slot in module,Adding steering servo and ESC.


Yellow NQD Jet Boat Sumner Surf at high tide jumping clear of the water, going vertical

11.1 V Lipo, 2200mah, AE-30A Brushless ESC, NQD 20mm Jet Drives, surfing Commenti disabilitati su Yellow NQD Jet Boat Sumner Surf at high tide jumping clear of the water, going vertical 

Shore cam

Going vertical
Chasing a wave
Climbing the wave
Over the crest

Running along a wave

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