Feature 2
in the same manner as existing catapults;
the eMALs system
after launch, the electric current in the
uses a long linear
motor will reverse to brake the shuttle electric motor to
to a complete halt without the use of a accelerate aircraft
water brake; over the flight
•
Power conversion electronics: the power deck. (photo:
conversion electronics derive power from Us Navy)
the energy store and convert this power
to a travelling wave of energy of the
appropriate voltage and current to drive
the shuttle along the launch stroke. Based
on solid-state technology, the power
electronics are packaged as compact
modules in cabinets below deck;
•
Launch control: EMALS uses an
advanced control system to manage
the current into the launch motor in
real time. More precise end speeds are
achievable over a wider range of aircraft
types and weights over those of steam
catapults; and
•
Energy storage: energy for launch is
drawn from the energy storage devices Equipment (PMA-251) programme safely operate if executing a launch during
during each two- to three-second launch. manager, initiation of HCT-2 is the next the sudden, unexpected loss of power.
The energy storage devices are recharged critical demonstration phase for the Once a launch has been initiated, the fully
from ship’s power between launches. EMALS test programme. redundant systems ensure the carrier is
“This effort will test the readiness of still able to launch aircraft.”
According to Captain Randy Mahr, the system for further operations,” he To ensure EMALS power train
NAVAIR’s Aircraft Launch and Recovery explained, adding: “EMALS is designed to testing operates efficiently and reliably
Apart from eMALs, Uss Gerald R Ford has a host of other planned improvements, and is due to commission in 2015. (photo: Northrop
Grumman Newport News)
Warship Technology May 2009 23
p22-23-24_WT_May09.indd 23 16/04/2009 11:59:26
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