Top Flite TOPA0965 - Manual (Page 22)

22
INSTALL THE COWL & DUMMY ENGINE
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1. Locate four 1/2" x 1/2" x 1" [13 x 13 x 25mm]
hardwood cowl mounting blocks. On each block mark
a line 1/4" [6mm] from the end of the block.
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2. Epoxy each block to the front of the fuselage. Use
the line you made as a guide for positioning the block.
The line should be fl ush with the fuselage. One block
should be mounted at each of the twelve, three, six
and nine o’clock positions on the front of the fuselage.
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3. Position the cowl onto the front of the fuselage.
As you place the cowl you may fi nd that you will
need to make cut outs in the cowl to accommodate
the cylinder head, muffl er, needle valve, etc. Cut
openings in the cowl as needed.
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4. Once the cowl fi ts over the engine, position it on
the cowl mounting block so that the engine is centered
inside. To allow for proper clearance you may fi nd it
helpful to place a propeller onto the engine. Once you
are satisfi ed with the placement of the cowl, mark the
location of the cowl mounting blocks on the cowl with
a fi ne tip felt marker. Hint: The cowl mounting blocks
are very close to the back edge of the cowl. You should
be able to easily see the location of each of the blocks
from behind the cowl, allowing you to properly mark
each position onto the cowl.
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5. Start with the top cowl mounting block. Double
check the position of the cowl. Then, on the mark you
made on the cowl, drill through the cowl and into the
mounting block with a 3/32 [2.4mm] drill. Install a #4 x
5/8" [16mm] screw and a #4 fl at washer into the hole
you drilled. Repeat this for each of the four mounting
blocks. As you drill each hole double check to be sure
your cowl remains centered on the engine. Remove
the screws and cowl. Apply a couple drops of thin CA
into the holes to harden the threads.
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6. Cut away the portion of the dummy engine that
will be in front of the engine cylinder. This is needed
for proper cooling of the engine. When determining
the exact location to cut, note that cylinders should
be oriented as shown in the picture. We were able to
cool the O.S. .91 by only cutting away a small portion
of the cylinders as shown in the picture.
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7. Drill a 1/8" [3mm] hole into each of the cylinder
heads as shown.