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9ZAP 9Z World Champion Model 2 Manual

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DESCRIPTION
O
F NEW FUNCTIONS
DESCRIPTION OF NEW FUNCTIONS
FUEL MIXTURE CONTROL (FMC) FUNCTION
Adjustment of the maximum speed of an ordinary engine outside the specified range
is extremely difficult, even if adjustment is possible. Adjustment of even carburetors
with a special adjustment mechanism is limited to about two points. Therefore, ob-
taining a stable speed matched to the model is extremely difficult and engine (carbu-
retor) adjustment takes a long time, especially with a helicopter, when the mixture
ratio differs when landing, hovering, and flying, and because there is a large change
depending on the fuel used.
The Fuel Mixture Control system solves this conventional carburetor problem by
independently controlling the fuel and air mixture fed to the carburetor. The engine
can be operated from low speed to high speed with a suitable mixture ratio by using
needle control to control the fuel and air mixture regardless of the carburetor.
There are also problems that cannot be solved with these carburetor systems alone.
These problems are knocking, choking, and flooding caused by sudden operation.
When accelerating, the fuel supply is temporarily delayed and the mixture becomes
lean. When decelerating, the fuel supply becomes excessive and flooding occurs eas-
ily. Both cases are connected to engine stalling. Stable operation can be realized by
using an acceleration function that temporarily increases the fuel amount and a decel-
eration function that temporarily decrease the fuel amount when accelerating and
decelerating, respectively.
Actually, CH3 controls the air adjustment throttle and AU2 (CH8)controls the needle
for fuel adjustment. The needle works in conjunction with the throttle.
NEEDLE (AU2) FUNCTIONS
-Needle curve (9 points)(helicopter/airplane)
-CH8 function (helicopter only)
-Needle trim/needle high trim (helicopter/airplane)
-Needle low rate (helicopter only)
-Needle hovering (helicopter only)
-Needle hold (helicopter only)
-Needle acceleration high (airplane only)
-Needle deceleration low (airplane only)
-Needle engine cut (helicopter/airplane)
… 14 …


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