Great Planes Profile 38 - GPMA0487 - Manual (Page 23)

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6. Position the right main boom as shown.
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7. Locate the die-cut 3-ply 4° engine gauge. With the
right main boom flat on your building table, position the
engine gauge at the aft edge of the engine mount. Raise the
aft edge of the engine mount until it is aligned with the
embossed line on the gauge. You may need to lightly sand
the engine mount to allow it to be rotated in the main boom.
Note: The right main boom has right thrust and the left main
boom has left thrust.
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8. Once the engine mount is in position, use epoxy to
glue it in the main boom. Make sure the forward end of the
engine mount is flat on your building board and the aft end
is set to the line on the engine gauge. Wipe off any excess
epoxy with a paper towel dampened with denatured alcohol.
T-pins can be used to hold the engine mount in position until
the epoxy cures.
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9. While the epoxy is curing on the right main boom,
position the left main boom flat on your building table.
Position the engine gauge at the front of the engine mount.
Raise the forward edge of the engine mount until it is
aligned with the embossed line on the gauge. You may need
to lightly sand the engine mount to allow it to be rotated in
the main boom.
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10. Use leftover 1/16" [1.6mm] balsa sheet to fill in behind
the engine mount. Sand the sheeting flush with the main boom.
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1. Lay the fin and rudder over the plan. Lightly mark
the hinge locations on the leading edge of the rudder and
the trailing edge of the fin.
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2. Cutting hinge slots can be simplified with the Great
Planes Slot Machine ™ . This simple electric tool cuts a
perfect width slot for CA hinges.
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3. To cut the hinge slots, first locate the centerline of
the leading and trailing edges using the Great Planes
Precision Hinge Marking Tool (GPMR4005). Place the
blades of the Slot Machine on the wood where you want the
slot. Lightly press the teeth into the wood. When you are
satisfied with the location, press the button on the handle
and the blades will cut easily into the balsa wood.
Attach the Rudder to the Fin
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