20
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2) With the motor loosely in the motor mount,
twist the motor so the wires on the back of the motor
are perpendicular to the mounting tabs on the motor
mount. Slide the motor back so the front edge of the
motor is 3/4” in front of the motor mount halves.
Tighten the two machine screws to hold the motor
securely in place. See photo # 27 below.
Photo # 27
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3) Place the motor assembly up against the front
of the firewall. The motor wires and tabs should slide
through the precut slot in the firewall and the motor
mounting tabs should be vertical.
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4) To properly align the motor, center the motor
from left to right on the firewall. For the proper height,
center the back of the motor in the middle of the pre-
cut slot in the firewall. See photo # 28 below.
It is normal for the motor to be angled down.
The term for this angle is down-thrust. The
Whisper has 5º of down-thrust built into the firewall.
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5) While holding the motor in position, mark
the locations of the four mounting holes onto the front
of the firewall.
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6) Remove the motor from the firewall. Using
a 1/8” drill bit, drill four holes through the firewall at
the mounting hole locations.
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7) Mount the motor to the firewall using four
3mm x 18mm machine screws, four 3mm flat wash-
ers and four 3mm nylon insert nuts. Slide the ma-
chine screws through the mounting tabs and holes in
the firewall, then install a flat washer and nylon
Photo # 28
Photo # 29
insert nut onto each screw. Tighten the screws com-
pletely to hold the motor mount securely in place.
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8) Using a 1/4” drill bit, carefully drill three
holes through the firewall. These holes should be
located 3/4” up from the bottom of the fuselage. Two
of the holes are located 5/8” in from the fuselage
sides and one hole 1-1/8” from the fuselage side.
See photo # 29 below.
PARTS REQUIRED
COWL AND PROPELLER
INSTALLATION
JOINING THE COWL HALVES
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{2} Molded Plastic Cowl Halves, Right & Left
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{1} Nylon Propeller Hub
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{1} Nylon Spinner Cone
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{2} Propeller Blade Halves
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{1} Tapered Aluminum Hex Adapter
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{1} Threaded Adapter
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{1} Propeller Washer
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{1} Propeller Nut
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{3} 2mm x 12mm Smooth Shank Machine Screws
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{4} 2mm x 12mm Wood Screws
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1) Test fit the cowl halves together. One half
has a molded recess that the opposite half glues on to.
When aligned properly the front and back edges of
the cowl should be even and the seam should be flush.
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2) Hold the cowl halves together using strips of
masking tape taped along the outside of the entire
seam, both on the top and the bottom of the cowl. It
is important that the tape covers the entire seam.
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3) Using Kwik Bond Thick C/A, glue the cowl
halves together from the inside. To do this prop-
erly, run a thin bead of glue along the entire seam
while allowing the glue to seep into the seam and bond
the parts together.
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4) Allow the glue to thoroughly cure, then re-
move the masking tape.
Mounting
Tab
Motor
Wire
Mounting
Tab
Motor
Wire
Motor
Mount
Firewall
Drill
Holes
Firewall
3/4”
Motor
Machine
Screw
