Great Planes Lancair 60 ARF - GPMA1347 - Manual (Page 29)

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1. Test fit the cowl onto the fuselage. You will see that a
cut out needs to be made in the cowl to accommodate the
nose gear. Mark the location for the clearance slot. Then, cut
an opening in the cowl approximately 1/2" x 1" [13mm x 25mm].
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2. Locate the 1/8" [3mm] plywood baffle. This baffle has
been made to fit the O.S. .61 two-stroke engine. As stated
during the engine installation, this baffle is only required if
you are using the in-cowl muffler system from Top Flite.
Because of the tight engine and muffler installation it is
important that proper air flow is achieved over the head of
the engine. If you are using a different engine and adapting
it to the Top Flite in cowl muffler, you may have to change
the inside shape of the baffle. If you have chosen to use a
standard muffler or are installing a four-stroke engine, you
will have to make cut outs in the cowl to allow the head of
the engine to clear the cowl or for muffler clearance. In this
case there is no need for the baffle. If you are not using the
in-cowl muffler system, skip ahead to step 6.
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3. The photograph shows the position of the baffle over
the engine when it is installed inside of the cowl. If you have
any part of your engine or throttle linkage that conflicts with
the baffle, make those adjustments now.
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4. Place the baffle into the cowl. The baffle should be
approximately 3-3/8" [85mm] from the trailing edge of the
cowl. Roughen the inside of the cowl with 220-grit
sandpaper where the baffle makes contact with the cowl.
Clean the area with alcohol. Re-position the baffle. Use a
couple of small drops of CA to temporarily hold it in place.
Slide the cowl onto the fuselage. Looking through the
openings in the front of the cowl, check to be sure that the
baffle is placed properly over the engine. Turn the radio
system on and operate the throttle to be sure that it is
clearing the baffle properly. If there is any adjustment that
needs to be made to the baffle, do it now.
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5. Once you are satisfied with the placement of the baffle,
mix 1/2 ounce of 6-minute epoxy and microballoons. Make
a filet of glue where the baffle and the fuselage sides come
together. Set the cowl aside, allowing the glue to cure.
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6. Place the cowl in position on the fuselage, making sure
the engine is centered in the opening in the front of the cowl.
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7. Mix 1/2 ounce of 6-minute epoxy. Apply a thin layer
over the front and rear of the baffle with an epoxy brush.
This will fuelproof the baffle.
INSTALL THE COWL
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