The Gravitational Energy Company (http://gravityassistedpower.com/) is generating gravity assisted power for water pumping and electricity using the Feltenberger pendulum which has two advantages: reducing friction at the pivot point of the pendulum to near zero and thus reducing the occasional force needed to maintain motion and using a double-reciprocating mechanism so that the pendulum swings back and forth as well as sliding in and out of a piston.
Their first production model,
...the GP210 is a General Purpose piston pump that is used to pump water for irrigation or through a filtration system to produce safe drinking water. GEC donated a GP210 to help the earthquake victims in Haiti where it easily produced daily drinking water for around 4,000 people with only three hours of operation a day.
The pendulum on the GP210 weighs just 40 lbs. and is 48 inches long. It is a hand-powered machine that allows its operators to pump up to 1,000 gallons of water per hour. A selector pin on the axle alters the length of the linear stroke to change the flow rate/pressure of the water being pumped. This allows the operator to pump pressurized water, up to 60psi, through a reverse osmosis system with nearly the same effort required to maintain the swinging pendulum with no water pressure. There is NO other HAND-OPERATED pump in existence today that can pump water at these volumes or pressure.
A selector pin on the axle alters the length of the linear stroke to change the flow rate/pressure of the water being pumped. This allows the operator to pump pressurized water, up to 60psi, through a reverse osmosis system with nearly the same effort required to maintain the swinging pendulum with no water pressure. There is NO other HAND-OPERATED pump in existence today that can pump water at these volumes or pressure.
Here's the GP210 at work in Haiti:
Gravitational Energy Company (GEC) is scaling their Feltenberger Pendulum up to generate electricity: