Top Flite TOPA0705 - Manual (Page 30)

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between two 3/8" Ч 3/8" Ч 5/8" [10mm × 10mm ×
15mm] hardwood blocks.
INSTALL THE COWL
NOTE: After this manual was completed we made a
change to the cowl mounting blocks. The following
instructions correctly explain how to mount the cowl
however the pictures may differ slightly.
The cowl installation is not diffi cult but will require you
to work carefully and patiently to get a good fi t. Take
your time and you will have good results.
❏
1. Slide the cowl over the engine and muffl er. With
a high-speed motor tool, make cutouts in the cowl to
allow clearance for the switches, muffl er bolts and
muffl er exhaust. Work slowly and make small cuts,
enlarging them as you need to as the cowl gets into its
fi nal position. The engine installation we have shown
here will only require clearance on the left side of the
cowl. After you are satisfi ed with the cowl fi t, remove
the cowl from the airplane
❏
2. From the center of each of the cowl mounting
blocks, draw a line back 1-1/2" [38mm] with a fi ne tip
felt pen.
❏
3. Cut a piece of card stock or paper 1"× 9" [25mm
× 229mm]. Tape the paper to the top of the fuselage
in line with the top mounting blocks. Make a mark on
the piece of paper indicating the center of the block.
Do this for both of the top cowl blocks.
❏
4. Place the cowl over the engine, making sure that
the two paper references are on top of the cowl. Slide
the spinner backplate onto the engine crankshaft. With
the spinner tight against the engine thrust washer,
position the cowl 1/8" [3mm] back from the back plate.
Align the markings on the cowl with the markings on
the fuselage. Using the lines you made as a reference,
measure forward from the end of the line 1-1/2" [38mm]
and make a mark. Starting on one side of the cowl,
drill a 3/32" [2.4mm] hole through the cowl and into
the mounting block. Install a #4 × 1/2" [13mm] screw
and #4 fl at washer into the hole to secure the cowl.
Do this for all of the cowl mounting blocks. For the top
two blocks use the paper reference to determine the
drilling location. As you work your way around all of
the blocks be sure to stop between each hole you drill
and double check the positioning of the cowl making
sure it is aligned with the spinner backplate and the
reference lines on the fuselage.