QuiQue's Aircraft Yak-54S Assembly Manual - page 31
Step 3
Draw a line that matches up with the
middle of the hardwood blocks and
back onto the masking tape pieces
you just placed on the fuse.
Step 4
Measure back one half inch from the
front of the fuse former and make a
vertical line. That is the distance of
the overhang of the engine cowling
over the fuselage. See Figure 53.
Figure 53
Step 5
Slip the engine cowling, on the
fuselage, remember with the canopy
hatch always in place, over the four
pieces of masking tape you have
affixed with the one half inch vertical
lines with the back of the engine
cowling on those vertical marks.
Double check to make sure the
engine prop hub is somewhere close
to the center of the hole in the
engine cowling. If not you may want
to make some slight adjustments by
shifting the engine cowling. However
it is probably more important to
check to see if the cowling overall
looks straight on the fuselage. Like if
the top of the cowling is parallel to
the canopy hatch behind it.
Step 6
Cut the holes needed in the engine
cowling for the clearance of the
engine head, muffler and any other
protrusions that will ultimately be
outside of the engine cowling.
Please read the second paragraph
from here for cutting out the holes in
the engine cowling for some helpful
hints. If you do this now before
making the final attachment of the
engine cowl, it will be easier to make
sure that the crank case will be
centered in the front of the engine
cowling. See Figure 54 as an
example of the holes to be cut in the
engine cowling.
Figure 54
Step 7
Slip the engine cowling on the
fuselage and put some masking tape
just in front of horizontal lines that
you put on the masking tape on the
fuse. Extend the horizontal lines that
you see in picture 53 on forward onto
the engine cowling.
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