Carl Goldberg GPMA0955 EAGLE 2 - Manual (Page 53)

52
SETTING UP YOUR ENGINE
Do not attempt to fly your model until the engine runs dependably.
It should idle without stopping and the transition through alt
engine speeds should be smooth.
WARNING! The turning propeller can cause serious injury, such
as deep cuts. Never reach across the propeller! Avoid wearing
loose clothing (such as neckties) or jewelry which could fall into
the spinning propeller, Small children should not be allowed near
a running engine for these reasons. No one (including spectators)
should stand in line with the propeller-a broken propeller blade
becomes a bullet and could seriously hurt someone.
There are four basic adjustments to make your engine run well.
Compare your engine's carburetor to the sketch at left and locate
the four parts below.
1. Throttle "barrel" opening. The rotating cylinder inside the
carburetor is called the throttle "barrel". It has a hole In
the middle to admit air. By rotating the barrel, the throt-
tle can be "wide open" or completely "closed." This con-
trols engine speed.
2. Idle Low-Speed Stop-Screw. This screw allows you to
set how much the barrel can close for idle (to fully
closed-engine stop).
3. High Speed Mixture (also called the Needle Valve) con-
trols the mixture of fuel & air at high engine speeds.
4. Low Speed Mixture (controls fuel/air mixture at Idle
speeds)
Now that you know where these parts are, let's make the adjust-
ments one-at-a-time. There are four basic steps to make your
engine run well.
SETTING THROTTLE (engine not running).
Start with transmitter throttle stick full open and trim full high.
Then move throttle stick full low (with trim high) 1/8" throttle
opening should show. Moving trim full down should fully close
the barrel. If any adjustment is needed for proper range of throt-
tle movement, determine best combination of hole positions for
the servo wheel and throttle arm.
ADJUST IDLE/CUT OFF.
We recommend you adjust idle stop screw to just allow throttle
to fully close, this will allow you to shut off the engine on com-
mand when throttle trim is moved full down.
HIGH SPEED MIXTURE ADJUSTMENT.
Temperature, humidity, fuel blend, etc. are variables that effect
mixture. You should always start adjusting by setting high speed
needle valve first, approximately three turns, then go back to
idle. Adjust gradually, going back and forth until a good general
setting is made. Once an engine is properly set, you should not
have to touch the carb except for a click or two on high speed
(needle valve) fine tuning.