The Dynacool System-
All helicopters and many fixed wing aircraft are powered
by turbine engines. These engines differ from the thrust
jet engines seen on commercial aircraft in that they
power a rotating output shaft that ultimately drives a
rotor or propeller. Turbo-shaft engines are extremely
powerful for their size. Power outputs of 1,000 to 15,000
hp are common.
During manufacture and after overhauls, these engines
must be tested under simulated flight conditions. The
tests are performed in cells where the engines are
connected to dynamometers that provide a variable load
that consumes the power output.
During testing, all of the engine's vital statistics are
recorded. This data usually includes fuel consumption,
exhaust temperature, torque and horsepower, power
takeoff (PTO) shaft speed, and compressor and power
turbine speeds. If an engine fails to perform as specified,
it is re-worked and re-tested before being installed in the
The load on the engine's PTO shaft is usually provided
by a device called a water brake. These comparatively
small machines utilize a rotating element, apposed by a
stationary element, to convert the engine's torque and
speed into heat in a stream of flowing water. Early
installations used water on a once through basis to
consume the engines power. They soon evolved into
complex recirculating systems that included primary
pumps, secondary pumps, hot wells, and evaporative
Then late in the 1980's Futuretech Design developed a
simple, but large, recirculating system to consume the
huge amounts of heat produced by the turbine and water
brake. These systems bear the trade name "Dynacool".
They are completely closed. There is no direct contact
with the environment. The Dynacool system includes a
reservoir, pump, and cooling coils as its functional
elements. They conserve our precious supply of water.
They are quiet. And, they provide the water brake with a
clean predictable water supply to do its work.
The two original units have been in continuous use at
Petroleum Helicopters' Evangeline Air-motive Division in
Lafayette, Louisiana for nearly a decade. And still others
found their way to the Persian Gulf area to help in
Operation Desert Storm.
Although Dynacool systems have been used with water brakes from several
different manufacturers, they are used most extensively with Honeywell
brakes (formerly Lycoming brakes). Today, these viscous shear water
brakes are manufactured by the Aerospace Support Equipment, Technologies Services group (ASETS) within
The Dynacool dynamometer heat rejection system is an
excellent example of the commitment to solution
simplicity at Futuretech Design.