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Step 3: Installing the Steering Servo & Linkage
❑
Using a piece of double-sided tape, mount your steering
servo to the side of the battery tray, keeping it as far down
and forward in the tray as possible. Make sure that the servo
output shaft is toward the back of the servo tray, as shown.
☞
You will need to use a modeling knife to cut away a
portion of the battery tray to accommodate your servo. Try to
keep the hole as small as possible.
❑
Center the nose gear and use a pencil to mark where the
pushrod wire crosses the first hole out from the center of the
servo horn.
❑
Remove the steering arm assembly and make a Z-Bend
in the pushrod wire at the mark you drew.
❑
Reinstall the steering arm assembly. Attach the servo
arm to the Z-Bend, then attach the servo arm to the servo,
making sure it's centered. Install the servo horn retaining
screw to secure the servo arm into place.
❑
Make the steering linkage out of scrap elevator pushrod wire. The easiest way to do this is to make a Z-Bend in one
end of the wire and attach the Z-Bend to the predrilled hole (nearest the servo) in the steering arm. (You will need to
remove the steering arm to do this.) After doing that, follow these procedures to hook up the linkage:
●
Cut a small slot in the front of the battery tray where the pushrod wire will slide through. The slot should be located
so that it lines up with the pushrod wire when the steering arm is reinstalled.
●
Slide the pushrod wire through the slot and reinstall the steering arm. Using a pencil, place marks on the pushrod
wire where you need to make bends in the wire so that it will line up with the servo arm.
●
Remove the steering arm assembly and make the necessary bends in the pushrod wire using a pair of pliers.
●
Reinstall the steering arm assembly, then pivot the nose gear back and forth to ensure there is no binding present.
●
Center the steering servo and install a small, single-arm servo horn onto the servo, making sure it's centered.
Special Tip:
You will most likely need to use a short servo extension so that your steering servo lead will reach
through the radio tray and to your receiver. We suggest carefully cutting a groove in the side of the intake duct to lay
the servo lead into (just like with the battery wires). This will keep the intake duct as smooth as possible.
❑
With the flight battery installed, set the airplane on its wheels on your work table.
❑
Using a ruler, measure the distance that the leading edge and the trailing edge of the wing are from your work table (at
the glue joint). The leading edge of the wing should be about 1/8" higher than the trailing edge. If it is not, adjust the height
of the nose gear strut until you are satisfied with the alignment.
Special Tip:
It's important that when the airplane is on its landing gear the wing has positive incidence in relation to
the ground. This will help the airplane rotate off the ground easier. If the wing is level (zero incidence) or pointing
down (negative incidence) the airplane will have difficulty rotating - and it may never rotate at all.
