My first challenge was working out how to conect the engine flywheel to the lower wet of bearing blocks. From here it will be relativley simple to use pulleys to get the power up to the fan.

Using pro-desktop I was able to draw some scale designs around the bits I already have, I.E. a reliant robin propshaft, a set of beating blocks and of course the engine its self.

The yellow part is to attach the flywheel on the engine to the propshaft, the purple part is to hold the propshaft to the bearing blocks (light blue). It will also carry the lower pulley. Everything else in the middle is the propshaft.

The first challenge was to design and build the flywheel/propshaft adapter plate (yellow in the above image). Using prodesktop again I created this engineering drawing:.

(click on the photo for larger image)

The main part of the hovercraft which holds all the power transmission parts together is the fan frame. This has to be extra strong and as light as posible....

Using prodesktop I designed a suitable frame.

Once the design was drawn up I popped into Worcester and bought some 25x25mm steel box section.. After a lot of hacking, filing and welding I have a rather good looking fan frame.

(view from side)