❑
6) Use a sharp blade to separate the nylon Control Horn and
its Mounting Plate. With the wing panel upside down on the work-
bench, clip one of the control horns into the metal R/C Link on the
end of the aileron pushrod (use the second from the top hole of
the control horn). Then hold the base of the control horn down
flat against the aileron. Ideally we want the base of the control
horn to be right up against the front edge of the aileron, which
should put the R/C Link/Control Horn pivot point directly over the
aileron hinge line. If the base of the control horn is too far back or
forward, screw the R/C Link in or out on the pushrod as needed
to achieve the correct location for the control horn. When satisfied
with the pushrod length, use a pencil to mark the two holes in the
control horn base onto the aileron. The remove the control horn
from the metal R/C Link for the next step.
❑
7) At one of the marks just made, drill a 3/32” dia. hole all the
way through the aileron, perpendicular to the bottom surface. Slip
a M2 x 20mm Bolt through the appropriate hole in the nylon con-
trol horn and push the bolt through the aileron. Position the horn
and drill the remaining bolt hole, again perpendicular to the bottom
surface of the aileron. Thread another M2 x 20mm Bolt through
the control horn base and the aileron. Adjust the drilled holes as
needed to line-up with the holes in the nylon Mounting Plate. Align
the holes in the mounting plate with the tips of the bolts protruding
from the top of the aileron. With a small phillips screwdriver,
thread the bolts into the holes in the mounting plate, securing the
horn to the aileron. Do not over-tighten the bolts and crush the
balsa wood aileron. Repeat this procedure with the remaining
wing panel. When done, re-connect the R/C Links to the control
horns.
Skip this section if you are planning to use an electric motor. De-
tailed instructions on installing an electric power system begin on
page 11.
The basic design of the RASCAL 72 EG is intended for mounting
your glow engine inverted in the nose. Over the years there have
been stories about inverted engines and how they run, primarily
having to do with “flooding” during starting. In our considerable
experience with running engines in the inverted position, we’ve
found that both two and four-stroke engines work perfectly fine in
the inverted position, with no more tendency to “flood” than en-
gines mounted in other positions. The difference can generally
be found in the starting procedures used by individual modelers.
Flooding can be minimized by remembering to keep the carbure-
tor closed between flights and during fueling. When first starting
the engine, keep the throttle in the low position. Using an electric
starter is recommended. Avoid “choking” fuel through the line by
placing your finger over the carburetor. Allow muffler pressure
and your starter to draw a small amount of fuel to the carburetor.
Incorporating these simple precautions into your starting routine
should make it easy to start your inverted engine every time.
Installing your engine in the RASCAL 72 will require some custom
installation work, based on the particular engine you’ve chosen.
While the installation of either a 2-stroke or 4-stroke glow engine
is basically the same, there are small differences. The primary
difference will probably be in the throttle arm location (4-stroke
engines will usually have the throttle arm on the opposite side
compared to a 2-stroke engine). Also the muffler style and loca-
tion is different between the two types of engines. Notice that a
plastic throttle pushrod sleeve is factory-installed in the RASCAL
fuselage, but it is not yet glued in place. Also, note that there are
identical holes in the firewall and formers to allow the throttle
pushrod to be installed on either the right or left side of the air-
plane, depending on which side is correct for your engine.
Locate the following parts from the kit contents:
❑
(1) Right Glass-Filled Engine Mount
❑
(1) Left Glass-Filled Engine Mount
❑
(4) M3 x 20mm Mounting Bolts
❑
(4) M3 Flat Metal Washers
❑
(4) M3 Blind Nuts
❑
(4) M3 Split-Ring Lock Washers
❑
(1) 1/8” od x 16” Nylon Inner Throttle Pushrod Tube
❑
(2) M2 x 7/8” Threaded Studs for throttle pushrod
❑
(2) Metal R/C Links
❑
(1) 260cc (11.8 oz) Fuel Tank Assembly
❑
(1) 5/16" x 3/4" x 3-3/16" Balsa Stick
❑
(1) Cowling
❑
(4) M2.6 x 10mm PWA Screws for cowl mounting
❑
(1) Spinner Assembly, 2-1/4” dia., white
You will also need to acquire these items (not supplied):
❑
(1) R/C Engine and suitable Propeller
❑
(4) Socket-Head Engine Mounting Bolts
❑
(4) Lock Nuts for engine mounting bolts
❑
(4) Flat Metal Washers for engine mounting bolts
❑
(2) 6" lengths of Silicone Fuel Line Tubing
❑
(1) Silicone Sealer (common kitchen & bath type)
ENGINE AND MOUNTS
The engine shown in these instructions, is a typical .46 size
2-stroke engine. It is being mounted in the inverted position.
❑
1) There are four sets of “circled cross-hairs” etched on the
front of the plywood firewall to mark the locations of the mounting
holes for the glow engine mounts. These hole locations should
7
GLOW ENGINE INSTALLATION