Simple Motorized Hovercraft (Make It Fly Contest)

I am Aron and i'm from Northridge Middle School. I recently wanted to build a hovercraft so I designed my own using Fusion 360.

Mechanics

Hovercrafts work because air is pushed down under the base which forms a cushion of air for the hovercraft to float on effortlessly. A motor can then be added to the top for propulsion. Professional hovercrafts use a skirt to increase the efficiency of their hovercraft but this simple hovercraft can do without one.

Supplies

1 old CD
1 ballon
one AAA battery holder (should only hold a single battery)
A drone motor with the fan
Hot glue
A 3D printer
Filament
Wire
2 coffee stirring sticks / 2 skewers (each around 10 cm long)

Tools

Fusion 360
Calipers/Ruler

Step 1: Attaching the Attachment for the Ballon

Download the "Ballon Attachment For Hovercraft.stl" and 3D Print it.

Next add hot glue to the bottom of the rim of the model and center it on the CD (shiny side up for aesthetic reasons), so that air can pass thought the model and the hole in the CD.

Ballon Attachment For Hovercraft.stl
Download View in 3D

Step 2: Sketching the Motor Housing Part 1

Because all motors are shaped differently we will have to design an individual housing suited to the motor.

Open up Fusion 360 and create a sketch on the horizontal plane.

Create a circle with a diameter equal to the diameter of your motor plus your usual clearance between parts (I recommend 0.2 mm)

Next create another circle with the diameter of your fan for the motor plus 10 mm.

After that make a concentric constraint with both circles so that their center is on the same point

Step 3: Sketching the Motor Housing Part 2

Offset the smaller circle by a value of +1.5mm

Offset the larger circle by a value of +2.5mm

Draw a line from one side of the largest circle through the middle and all the way to the opposite side (basically drawing the diameter of the largest circle).

Offset this line by the values of +1 and -1

Step 4: Extruding the Motor Housing

Extrude shown shape in the following picture by an amount that is a bit more than half of your motor height and print this shape

Step 5: Attaching the Motor Housing

Press the motor into the smaller circle and secure it with hot glue.

Then attach the fan to the motor.

Finally using hot glue attach the motor housing to the front of the hovercraft with the fan facing forward as shown.

Step 6: Attaching the AAA Battery Holder

Using hot glue attach the AAA battery holder behind the ballon attachment as shown.

Step 7: Soldering the Wires Onto the Motor

Attach some wires between the AAA Battery holder and Motor as shown (IMPORTANT : Make sure the motor would push air away from the CD rather than to the center of the CD when the battery is place in the battery holder).

Step 8: Attaching the Ballon

Attach a ballon to the Ballon Attachment on the center of the hovercraft.

Step 9: Attaching the Holder for the Ballon

Using hot glue attach the coffee stirring sticks/ skewers rotated at an angle of 120 degrees and -120 degrees from the motor housing as shown in the picture.