The X-tinguishers are going to build a jet powered boat. The main piece they'll need is a jet pump, or impeller. An impeller is basically a propeller in a tube. Water is sucked in one end, spun round by the propeller and thrown out a smaller tube at the other end. The result is a jet of water that will push the boat through the water. They will have to be concerned with bouyancy and water resistance which will slow their boat down.

The Body Snatchers are going to build a platform of oil-barrels with an engine mounted fan that will blow them up the river. They will also have to be worried about fighting water resistance from their blunt ended platform, a high center of gravity, bouyancy...um...looks like they have to worry about everything.

The X-tinguishers l to r; Morley, Captain Westy & Fergy inset; expert Alan Pickard	The Body Snatchers l to r; Gerry, Captain Tim & Debbie inset; expert Colin Poole
The X-tinguishers are building a boaty looking white water racer	The Body Snatchers are building a platform of oil barrels
That horse-trailer roof looks like a boat	One drum down, 8 to go...
Boat. Check.	Having only 6 drums, the Body Snatchers are building a catamaran racer
Jet ski impeller unit. Check.	That fan, when mounted, to...
...this massive engine will push their boat along quite well	A Body Snatcher gets ready to do some major cutting
Judge Steve Curtis	The X-tinguishers need this water tight compartment to house their jet
Ooh! Not the best place for an errant welding spark to land!	Holes in your boat should be patched
These prows will hopefully make the boat more stream-lined	Cathy tells Robert that the Body Snatchers' expert isn't sure their boat will float since it will weigh a full ton
Fire! Fire!	The Body Snatchers take time to install a safety cage over their fan

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