WonderCraft

What is a hovercraft?

A hovercraft is a vehicle that can travel across land and water. It floats above the land or water on a cushion of air. The friction between the surface and the vehicle will become very slight. A hovercraft can move faster than an ordinary craft with the same power. Hovercrafts are widely applied in commerce, military, recreation and many other fields.

Materials you need

• Plastic foam (for hull, 40 * 40cm)
• Plastic bags (for skirt, 30 * 40cm)
• Wood boards (2 mm thick)
• Electrical (Insulating) tapes
• Hot melt glue and hot melt glue guns
• Screws and nuts
• DuPont Lines (Wires)
• Radiator fan x 1 (12V,1.5A)
• Electronic speed controller x 2 (ESC, 30A is enough!)
• Brushless motor x 2 (XXD KV1000)
• Propeller x 2 (diameter: 6.4cm)
• Servo x 1 (9g)
• Arduino UNO board x 1
• DC power socket for Arduino x 1
• Battery x 1 (2200mAh, Li-Po battery)
• PS2 wireless joystick & Receiver x 1

We purchased those materials on Taobao.com. You can purchase similar ones on ebay.com.

Tools you need

• Craft knife
• Screwdriver
• Scissor
• Electro drill

Time requirement

• Preparation: 2 weeks
• Installation: 2 hours
• Testing and debugging: 3 hours

Difficulty level

Recommended age: 13 years old and above

• Cut out a piece of 40 * 40cm plastic foam into the shape of a 20 *30 cm rectangular.
• Cut the front of the rectangular into a semicircle of radius 10cm.
• Cut out a circular hole of diameter 9cm at the center of the board.
• Cut two pieces of 2 *18 cm plastic foam and one piece of 2 *16 cm plastic foam.
• Stick the three pieces of plastic foam onto the edge of the hull.
• Cover the whole bottom of the hull with the plastic bag and cut a 16 *16cm square along the three pieces of plastic foam.

• Fix the radiator fan against the hole.
• Use screws and nuts to fix the fan to the hull.

• Cut out two pieces of wood of 4cm wide and 7.5cm long.
• Drill holes on the wooden board to fit the cross-shape metal.
• Fix the brushless motors on the wood boards with screws and nuts.
• Fix the propellers on the motors.
• Cut two 4cm * 3cm *2cm pieces of plastic foam and stick them onto the bottom of wooden boards
• Use the hot melt glue to fix the wooden boards on the hull.

• Attach the red wire on the motor to the VCC (positive) slot on the ESC.
• Attach the black wire on the motor to the GND (ground) slot on the ESC.
• Attach the yellow wire on the motor to the SGN (signal) slot on the ESC.

• Prepare a T-shaped interface adapter, a DC power interface adapter and two DuPont lines.
• Make your own adapter for the radiator fan and Arduino UNO
  
  • Cut one end of the T-shaped interface adapter off.
  • Attach both the DC power interface and the two DuPont lines to that end (in parallel connection).
  • Bind all the connections with the electrical tapes.
• Attach all the ESCs to the adapters.

• Use the electrical tapes to stick the receiver on one side of the radiator fan as shown in the picture.

• Upload the program to the Arduino.
• Connect the receiver and Arduino according to the instruction in the picture.
• Connect the white pins on the ESCs to one of the digital pins (we used #3 and #5) on the Arduino; connect the black pins on the ESCs to one of the GND pins on the Arduino.
• Plug the DC power adapter into the Arduino.

• Fix the servo in the middle of the two fans with hot melt glue.
• Connect the red wire to the 5V pin on the Arduino; connect the black wire to the GND pin on the Arduino; connect the orange wire to one of the digital pins on the Arduino.

• Fix the battery in the front of the radiator fan with electric tapes.
• Place the Arduino board on the battery. Bind them together with electric tapes.
• Attach the battery to the T-shaped interface adapter. The hovercraft will float up. Control the hovercraft with the PS2 joystick.
• Drive (or say, fly) at will!

If …

• The hovercraft fails to float:
  
  • Check the skirt to see if it’s broken.
  • Make sure the total mass of the hovercraft is less than 800g.
• The hovercraft rotates on itself:
  
  • Move the battery around on the hull. Try to balance the weight. Just place the battery where the hovercraft stops rotating.
• The hovercraft does not respond to your control:
  
  • Make sure no other PS2 controllers around are interfering your signal.