Strana 18
To be continued with
MiG-21bis ground attack
ordinance.
TECHNICS / EQUIPMENT
nozzle from contamination and damage to the
membrane, the nozzle cover must be removed
before takeoff, and it is colored red.
Cable, connects the pyro cartridges stored
in the front cover to the aircraft’s electrical
system.
Aerodynamic cover, a thin-walled, hat-shaped
aluminum container, its task is to protect the
electrical wiring from damage.
Nut, used to secure and tighten the rear cover
to the grate.
Protective cap, designed to protect the
front cover from mechanical damage during
transport and storage, also painted red.
Igniter, used to safely ignite the solid fuel of
the RATO unit, consists of 350g of coarse-
grained, black powder, which is enclosed in an
aluminum hermetic case.
Pyro cartridges, type DP-1-4, used to initiate
the igniter, two pyro cartridges are inserted
for safe and reliable operation.
Fuel, consists of NMF-2D solid propellant,
cylindrical in shape with a longitudinal cavity.
The Principal behind the RATO
System’s Functionality:
The two RATO bottles, suspended from the
aircraft, are activated by sending an electrical
signal to the pyro cartridge contacts, after
which the electrical impulse is applied to the
filaments of the double heating bridge of the
pyro cartridges. The heating filament ignites
the pyrotechnics and the pyro cartridge
initiates the igniter. The igniter ignites the
solid propellant. The powder gases generated
by the burning of the fuel create pressure
inside the RATO bottle, which is converted into
reactive force by the flow of gases through
the nozzle. After the bottle burns out, the pilot
activates a pneumatic cylinder, which ensures
the jettisoning of the front attachment node
from the aircraft. Due to the effect of its own
weight and the action of aerodynamic forces,
the RATO bottles separate from the aircraft
and fall to the ground.
SPRD-99 RATO bottle, overall view of the installation method under the right side of the fuselage.
Photo: Ing. Martin Janousek
#2151
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Product Page
INFO Eduard18
May 2025