This challenge will require the teams to build a vehicle capable of extinguishing fires. In the ten hour time limit, the teams will be building fire trucks that must extinguish three different kinds of fires. The first is a dumpster/garbage fire. Next they will have to put out a 1988 Lincoln Town Car and finally, a "towering inferno" consisting of a stack of wooden pallets. The team who completes all of the tasks first wins. If either team should run out of water, they will have to drive all the way back to the start to refill their tanks.
 

Hackett wants to build what amounts to a giant fire extinguisher. An air compressor will pump air into a tank and pressurize it. This tank will be connected to a second tank which holds the water. The compressed air will force the water out under pressure. This will provide a really good stream of water that should put of the fires quite easily. However, it require two tanks, two sets of valves...just a whole lot of parts. The other downside is that this design will pump out a lot of water quickly. This could cause them to have to refill more often than Col Dick.
 
Col Dick just wants a "simple" pumper truck. A truck with water tanks will hold 2 engines on the bed. One engine will be connected to the other and power it. The powered engine will have a tree of valves on the top of the pistons. The natural action of the engine pistons is to pump (oil) so Col Dick wants to take advantage of this action. It's not ridiculously complicated but does it sound familiar? It should because its the same design Col Dick used to defeat The NERDS in the Series 3 final (Fire Boats). It should produce a steady, yet puny stream.
 

The Red Team One, Liam and Jason	The Blue Team Ray, Gevin and Major
Hackett's Fire Engine	Col Dick's Engine Pumper No1
Hackett deems this will be a perfect tank for holding lots of water	This freezer, while water tight, won't cut the mustard with the Colonel
A half ton truck should make a good base for Hackett's design	This badly smoking van will suit  the Colonel, once it loses the back
Hackett's team are cracking along with this air compressor	The blue's have also found a pump in this old engine, sans a few parts
And, this engine will turn over the other engine, creating a pump	An inlet and outlet must be cut into the propane tank for filling and spraying
Hackett give the Colonel a bunch of check valves, necessary equipment	Once this pipe gets squashed some, it will make an excellent nozzle
Hackett's back-up plan is a bucket on a stick for dumping water right on the fire	A differential will allow the blues to gear down their engine to regulate the flow from their pump
The water tank goes in	Blue's complex valve tree
The Blue's Pumper/Tanker	Hackett's High Pressure Truck

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