Figure 14. "Off the runway" ejection sequence.
area, the hydraulic fluid is pressurized to
propellant contained in the chamber. As
3,000 psi as the piston is stroked. The
this propellant burns, it ignites the main
fluid is forced through the actuating
propellant charge (sustainer) contained in
mechanism (5) and the spent fluid is
the series of tubes which makes up the
returned to the opposite side of the piston
gas generator. The walls of the propellant
at a low pressure. When the piston
grains are inhibited so the propellant must
bottoms, the shift valve (2) exhausts the
burn from end to end as a cigarette. As
high pressure gas and reverses the
the stub end of the propellant stick burns,
direction of the gas piston. The hydraulic
it ignites a primer cord which ignites the
fluid becomes pressurized in the opposite
propellant in the next tube, and so the
direction, and these cycles continue until
burning continues for 8 minutes.
burnout of propellant in the gas generator
(5) Figure 16 shows the entire auxiliary power
occurs (approximately 8 minutes).
supply system. The gas produced by the
(6) The surge accumulator (6) absorbs surges
burning propellant passes through a filter
of fluid and maintains a constant flow
in the gas generator, through an external
when the pump reverses direction. The
filter and pressure release valve, into a
oil reservoir (7) contains the fluid
shift valve (2), where it is directed into
displaced when the piston rod is in the
one end of a double-acting pump. The
pump chamber and provides back
double-acting pump transforms gas
pressure in the system.
energy (3) to hydraulic fluid energy (4).
By means of a 2 to 1 differential piston
17
