Install The Cowl - GREAT PLANES ultimate! Instruciton Manual

Note: If using fuel line barbs (as recommended for gas
engines), replace the aluminum fuel tubes with 1/8" [3.2mm]
brass tubing (not included). Cut the brass tubes to the correct
length, and then solder the barbs onto one end of the tubes.
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2. Install the tank into the fuselage with the neck of the
tank through the front former. Hold the tank in place with two
#64 rubber bands included in the kit.
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3. Install silicone fuel tubing onto the aluminum tubes
from the fuel tank. (If this is a gasoline engine installation
substitute neoprene or Tygon
tubing. Silicone is not resistant to gasoline!) The line with the
fuel clunk will feed to the fuel inlet at the needle valve and
the other will attach to the pressure tap on the muffler. If you
choose to use some kind of an external fuel valve, follow the
instructions with your particular brand of fuel valve. You can
also install a third line to the tank and use it for filling the
tank. The method you use is your choice but make your
decision before moving onto mounting the cowl.

Install the Cowl

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1. Epoxy five 1/2" x 3/4" x 3/4" [13 x 19 x 19mm] hardwood
cowl mounting blocks to the front fuselage former. Use two
blocks on each side and one block at the top center.
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2. Place masking tape onto the side of the fuselage
aligned with each of the mounting blocks. Draw a line from
the center of the mounting block back 3" [76mm]. Do this for
all five mounting blocks.
® fuel tubing for the silicone fuel
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2. The following instructions are for assembling a cowl
alignment tool that you will find helpful in centering the cowl
onto the engine shaft. Parts are included for making this tool
for use with the O.S. 1.60 and the Fuji-IMVAC BT-43 EIS
engines. The tool may be used for other brands of engines if
you make minor adjustments to the parts.
Included are four 1/8" [3mm] disks with an outside diameter
of 2-11/16" [68mm] and a 1-1/2" [38mm] inside diameter.
The inside diameter of these disks is designed to fit over the
drive washer of the O. S. 1.60 two-stroke engine. Also
included are four 1/8" [3mm] balsa disks with an outside
diameter of 2-11/16" [68mm] and a 2" [51mm] inside
diameter. The inside diameter of these disks is designed to
fit over the drive washer of the Fuji-IMVAC BT-43 EIS
gasoline engine. Use the appropriate disks for your engine
choice when proceeding with the following instructions.
Glue the four smaller disks to each other, forming a 1/2"
[13mm] thick disk. Glue the two larger disks together,
placing the large disk with the embossed circle onto the
large disk with the small hole.
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3. Glue the 1/2" [13mm] thick disk onto the large disk,
centering it inside of the embossed lines. In the future this
will be referred to as the cowl tool.
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