Impress your friends and neighbors. Be the only person on the block to have a flying coaxial lawn sprinkler.
Simply connect one end of your garden hose to the fitting on the sprinkler's high-pressure area, Then connect the other end to the water tap. The more you turn on the tap the higher the sprinkler will fly.
Description of Operation: Water from the hose enters the high-pressure area. It then exits this area via the Roots-type-blower lobe gears. These gears drive the pinion gears which drive the two ring gears, which drive the two counterrotating rotors. The water exits through ports along the trailing edge of the blades and sprinkles the lawn.
Also Make Money: On a sunny day, set up lawn chairs and charge people for watching the rainbow.
On a windy day, charge your neighbor for watering his lawn.
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Alternate Application from the Department of Demented Designs:
OTHER: Miscellaneous - Thoughtless Ideas - Engine for Coaxial Rotor