PART I - DESCRIPTIVE
11. Throttle/H.P. fuel cock
The high pressure fuel cock (26) is controlled by the
throttle lever. When the lever is fully back in the H.P.
COCK gate the fuel supply to the engine is cut off. When
the lever is moved forward of the gate, sufficient fuel
is available to maintain idling r.p.m. A spring-loaded
trigger on the throttle lever prevents the throttle being
returned through the H.P. cock gate, once it is forward
of that position A throttle damper is aft of the control.
12. Automatic variable swirl vanes
(a) The first row of stator blade in the engine compressor
consists of variable swirl vanes which assist in imparting
swirl to the incoming air. When normal flight r.p.m.
are reached, the swirl vanes move progressively to the
minimum swirl position which occurs at about 7,000
r.p.m.
(b) The swirl vanes have no noticeable effect on engine
operation. However, until the swirl vanes reach the
minimum swirl position at about 7,000 r.p.m. the com-
pressor is not operating at maximum efficiency.
13. Starting system
(a) Starting is by means of a liquid fuel starting system.
This type of system is similar in operation to a cartridge
starter system in that the gases from the burning monofuel
drive the starter turbine and thus rotate the engine.
Instead of starter cartridges, liquid isopropylnitrate,
stored in a tank, is fed to and ignited within the starter
motor.
(a) The main control switches are:-
(i) The battery master switch (68).
(ii)The ignition switch (adjacent to 63) which controls
the current to the igniter plugs. It should normally
be locked in the ON position.
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