18
you do not need access to that area. We recommend simply
tack gluing the hatch in place with a couple small tabs of glue.
Then seal over the seams with either clear tape or white
covering material (not supplied).
❑
43) 2-STROKE THROTTLE PUSHROD
a)
The first step is to install your throttle servo in the fuselage using
the rubber grommets, eyelets, and screws that came with the
servo. Mount the throttle servo in the front opening of the servo
tray, with the servo control arm to the front.
b)
The supplied throttle pushrod assembly consists of a wire pushrod
running inside a nylon pushrod tube. For a typical 2-stroke
installation we prefer to connect the Z-bend end of the pushrod to
the throttle servo arm. The plain end of the pushrod wire will
connect to the carburetor using a Metal Pushrod Keeper, which
allows you to easily adjust the overall length of the pushrod at the
carburetor.
c)
Install the Metal Pushrod Keeper on the engine's carburetor
control arm, with one hex nut on each side of the arm. Note: You
will probably need to drill out the hole in the carb arm with a 5/64"
dia. (or #47) drill bit to accept the threaded portion of the Pushrod
Keeper. Tighten the hex nuts securely against each side of the
carburetor arm. Be sure to put a small drop of thread locker on
the last hex nut. After the hex nuts are tightened against the arm,
the barrel of the Pushrod Keeper should still be free to rotate.
d)
Slide the plain end of the wire pushrod into the back side of the
firewall, through the hole you previously drilled in the firewall.
e)
Next slide the Nylon Throttle Pushrod Tube over the plain end of
the pushrod wire at the engine. Keep sliding the tube back over
the pushrod wire, through the hole in the firewall, and keep sliding
it back until approximately 1/2" of the nylon tube remains in front
of the firewall.
f)
Now slip the plain end of the pushrod wire inside the pushrod
keeper. Attach the Z-bend onto the servo arm and set the servo
in the middle of its travel. Set the carb in the middle of its travel,
and then tighten the set screw in the end of the pushrod keeper.
g)
Turn on your radio and check the operation of the throttle
pushrod. Make adjustments as needed to get full range of
carburetor travel. You can adjust the overall length of the pushrod
with the Pushrod Keeper. Use the EPA (End Point Adjustment)
feature of your transmitter to accurately dial-in the desired
amount of servo travel. Also make sure there is no binding in the
throttle linkage, which could cause unnecessary battery drain.
h)
When satisfied with the installation, glue the nylon pushrod tube
permanently to the firewall with epoxy or silicone sealer. Note:
You may find it necessary to support the servo end of the nylon
pushrod tube with a scrap of balsa, plywood, or foam - to keep the
pushrod from flexing.
i)
Ideally, this is the range of throttle moment you want to achieve:
STICK FORWARD STICK BACK STICK BACK
❑
44) 4-STROKE THROTTLE PUSHROD
4-Stroke glow engines typically have their carburetor on the back
of the engine. This puts the throttle arm very close to the firewall
of the airplane. They also often have the throttle arm on the left
side of the airplane, instead of on the right like most 2-stokes.
Note that the location for the throttle servo in the plywood tray
can be switched with the RASCAL 80. If you plan to use a 4-stroke
engine, simply move the throttle servo to the appropriate
opening in the servo tray.
❑
45) COWLING
You will most likely need to make a large opening in the bottom
of the cowling to clear the engine cylinder head and carburetor.
Don't be tempted to quickly dive in with a knife and start
removing large chunks of material. You will achieve a lot better
result if you take the time to develop a pattern and mark it on
the cowling for guidance when you are cutting.
Be aware that there are no hard and fast "rules" for the exact perfect
shape for openings in a cowling. Most important, make it big enough
to provide the access you need to the engine. The best method is to
"sneak up" on these openings, continually trial fitting the cowling over
the engine until it finally fits properly. Once the opening is big enough
for you to slip it over the engine and place it in correct location on the
model, then continue modifying the opening as needed to provide
access to the needle valve and the fuel line tubing at the carb.
TRIM FORWARD
HIGH SPEED
TRIM FORWARD
GOOD IDLE
TRIM BACK
KILL ENGINE
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