Great Planes Yak-55M 50-55cc Sport / 3D ARF - GPMA1230 - Manual (Page 21)

21
Tuned Pipe Installation
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1. Remove all of the covers from the bottom of the fuselage.
Glue the balsa fl oor and side walls in place in the back of
the tunnel.
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2. Refer to the instructions for the canister. The procedure
is the same except that you will use four pipe holders instead
of two that are used for the canister installation.
MOUNT THE COWLING
AND DUMMY ENGINE
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1. The kit includes six 5/8" x 5/8" x 3/4" [16mm x 16mm x
19mm] hardwood cowl mounting blocks. Depending on the
muffl er you chose to mount, you may not choose to use all
of the blocks. As shown for the canister installation we glued
fi ve of the blocks to the front of the fuselage as shown here.
Determine how many of the blocks you will use and where they
will be positioned. Then, glue them to the fi rewall with epoxy.
After the epoxy has cured be sure to fuel proof the blocks.
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2. On the back side of the fi rewall make reference marks
for the location of the blocks. On the remaining blocks, tape
a piece of masking tape over the block, extending back onto
the fuselage. From the center of the block make a line 1"
[25mm] long.