Lockheed YC-
V-SPEEDS:
Vmca =
112 KCAS
ENGINE OPERATION
NOTES.
Throttles:
Engine power
is controlled by a single lever, the throttle, which coordinates fuel flow with
propeller governor setting (propeller RPM).
Reverse
thrust is available by a mouse click on reverse lights or by pressing the
"F2" key. In VC, reverse power can be controlled by the reverse
levers attached to throttle levers. To cancel reverse power, you can press the
“F1” key, click again on reverse lights or advance throttle in the positive
range.
The throttle
quadrant has three basic positions: Ground Idle, Flight Idle and Take Off. In the
Flight Idle position there is a detent to avoid going below this position in
flight. The Flight Idle power is adjusted to give zero thrust at 85 KIAS.
In FS9 there
is no possibility to simulate the Flight Idle detent, so the throttle idle
position yields Flight Idle when airborne and Ground Idle on ground. On ground,
the throttle range from 0% to 6% is equivalent to the range from Ground Idle to
Flight Idle in the real airplane.
Propellers:
The engines
are equipped with full-feathering, reversible pitch propellers, incorporating
synchronized or constant speed governor control. The normal RPM range is from
91% to 100%. In Ground Idle, RPM is 71-75%.
The governor
controls the engine RPM according to throttle position, in the range from 91%
to 100% RPM.
Propeller Synchronizer:
Provision
for synchronisation the four propellers through a limited band (2%) of RPM is
provided for by an electronic controller. Either engine #2 or engine #3 may be
selected as master engine. A two positions synchronizer
switch is located in the FE panel, placarded
ENG 2, OFF and ENG 3. The synchronizer is operating only if propeller condition
lever is in the RUN position.
Propeller condition levers:
Four
propeller condition levers are located in FE panel. The levers have three
positions: FEATHER, UNFEATHER, and RUN.
Fuel Shut-Off Levers:
Four fuel
shut-off levers are located in FE panel. The levers have two positions: OFF and
OPEN.
Negative Torque Control:
A Negative
Torque Control (NTC) is installed in each engine to automatically provide an
increased pitch (decrease RPM) whenever a condition of negative torque
(propeller driving the turbine) exists, to reduce the windmilling
propeller drag. When a negative torque is detected, the pitch is increased to
reduce RPM to about 60%. The system is armed when airspeed is below 270 KTAS.
If engine
power is restored prior to feathering, normal propeller operation is restored
automatically.
Fuel pumps:
Electric auxiliary
fuel pumps are installed in each tank, supplying fuel to main fuel manifold. To
avoid cavitations in engine driven main fuel pumps, the auxiliary pumps of
tanks in use should be switched on as long as the engine runs. Four low fuel
pressure warning lights are installed in FE panel, illuminating if there is not
enough pressure to feed the engine fuel pumps safely.
PERFORMANCES
SUMMARY (from USAF Flight Manual):
RATE
OF CLIMB.
When holding at low weights, it is recommended not to
reduce power below 30% of Normal Rated Power (about 10 psi
TP at S.L.), allowing speed at low altitudes to be higher that indicated in the
table above for weights below