Step 3: The Thrust Engine
So once you have a fan you need to build a duct. I used more lauan plywood to cut out the shape and screwed in a bunch of 1x2s to hold the two pieces together. Then I wrapped more aluminum flashing around the whole thing to make the duct.
The fan was mounted to a 1/2in shaft that ran through two brass bushings with a pulley on the other side. This was all mounted on a 2x4 and plywood frame. Then a smaller frame was made to hold the engine up so that the belt would fit. No type of clutch was used on the engine which is typical for most hovercraft. This finished the thrust engine and fan.