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Section 7: Installing the Elevator, Control Horns, and Linkages
Step 9. Install the other stabilizer half onto the tubes on the
other side of the fuselage. Carefully slide the stabilizer onto the
tubes until it contacts the side of the fuselage. When both
stabilizer halves are touching the fuselage sides, make a mark
through the hole for the 4-40 cap screw onto the tail tube located
near the trailing edge of the stabilizers. We suggest using a
1/16" drill bit to make the mark. If you use a larger drill bit, use
caution not to round out the hole.
Step 10. Remove the stabilizers and drill and tap the long tail
tube. Reinstall the stabilizers and thread the 4-40 cap screws and
split washers into place, securing the stabilizers to the fuselage.
Caution: Check the security of the screws before each flight.
Step 11. Remove the servo arms from the elevator servos and
replace them with Hangar 9
heavy-duty 1" arms. The arms need
™
to face up as shown in the photo below. Be sure to use a drop of
blue Locktite on the servo arm screw if using metal-geared servos.
Step 12. Screw a 4-40 ball link five to six turns onto a
4
1
/
" long 4-40 linkage. Screw the opposite end of the linkage
2
into the swivel control horn on the elevator. Adjust the linkage
length until the hole in the ball link lines up with the outer hole
in the servo arm when the elevator is neutral and the servo arm
is centered.
Step 13. Using the 4-40 screws and nuts included in the
Rocket City package, attach the ball link to the outer hole in the
arm. The correct sequence is 4-40 screw, ball link, servo arm,
and 4-40 nut. (Don't use the spacer/standoff.) Be sure to use
blue Locktite.
CONTINUED
21
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