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Paint the crankcase (EC2) dark grey but keep the paint off the surfaces that mate with other
parts. Epoxy the cylinders into the crankcase. Paint the crankcase rear (EC5) light gray and
epoxy to the crankcase. Take care that the pins for the spark plug wires are aligned as shown
on Sheet E.
Make the crank shaft (EM1) (5/32 (4mm) dia, 2.00” (51mm) long) and spacer (EM2) (7/32’
(5.5mm) dia, .46 in (11,6mm) .long). Position the spacer on the shaft so that when inserted in
the crank case front (EC1) and rear (EC5) the engine rotates freely on the shaft. Glue the
spacer to the shaft and then the front on the crankcase aligning it so that when the engine is
spun around the shaft it runs in a single plane. You can paint the front light gray, but do not
paint the shaft where the propeller mounts. See Figure 5.2
Figure 5.2 Engine Details
Paint the intake manifold portion of (EC4) bright copper and the valve train portion, black. Glue
in place on each cylinder.
Make the push rods (EM4) from 1/16” (1.6mm) brass rod and glue in
place.
They are about .75” (19mm) long, but need to be cut to length. And add the spark plug
wires, EM5 (.016 (.4mm) wire). Both of these parts are shown in detail drawings on Sheet E.
The front and rear mounts (EC10 and 11) yet need be attached to the shaft. Do not do these
yet, they will be added in the next stage.
Make the carburetor assembly as shown in the figure on Sheet E by cutting the intake tubes
(EM3) to 1.25” (32mm) long. Glue the tubes to the carburetor body (EC9) which has been
painted gray. Do not connect the carburetor to the shaft yet. This too will be done in the next
stage.
B.
Propeller
Part #
Name
Count
Material
EP1
Propeller hub
2
.020 Photo etched brass
EO1
prop bolts
16
0-80 x .25 hex bolt
PW1
propeller laminate 1
1
1/16 bass
PW2
propeller laminate 2
1
1/16 walnut
PW3
propeller laminate 3
1
1/16 bass