Great Planes Super Decathlon 40 Kit - GPMA0185 - Manual (Page 5)

DECISIONS YOU MUST MAKE NOW
ENGINE AND MOUNT SELECTION
The recommended engine size range is as follows:
.40* - .46 cubic inch displacement 2-cycle
.48 - .70 cubic inch displacement 4-cycle
*NOTE: Performance may be marginal if a non-schneurle-
ported .40 cu.in. 2-Cycle engine is used.
NOTE: If you install a 2-Cycle engine, we recommend
using a muffler that can be completely enclosed inside
the cowl. The muffler shown in the instruction book
photos is a Tatone #11434 Pitts Style Muffler for .45 - .80
engines.
The engine you select will determine how you build the
fuselage, so it is important that you have the engine close at
hand while building.
This kit includes a Great Planes MM40 engine mount
that fits most .40 - .45 (2-Cycle) engines (only slight modifi-
cation of this mount is required to mount the OS40SF and
OS45SF). If you are installing an OS48 SURPASS (4-cycle),
you may purchase a Great Planes MM60 mount. If you are
planning to install the OS70 SURPASS (4-cycle), you may
purchase the Great Planes MM60L mount. If you prefer, you
may purchase a custom engine mount for your engine, or you
may choose to install shock-absorbing rubber-cushioned
mounts.
NOTE: If you choose to power your Super Decathlon 40
with a 4-cycle engine, keep in mind that the RPM of your
engine will be considerably less than that of a 2-Cycle
engine; therefore, you should select a higher pitch
propeller to keep the speed and overall performance
roughly equivalent to that of a 2-Cycle engine. For
example, a 10x6 or 10x7 prop would be used with a .40
(2-Cycle) engine; but a 12x8,11x9 or 10x10 prop may be
the best choices for a 4-cycle engine.
SELECTION OF WHEELS
For maximum scale realism, 2-1/4" diameter main
wheels and a 1" diameter tail wheel may be used. However,
for better handling, we recommend 2-1/2" main wheels and a
1-1/8" or 1-1/4" tail wheel. For operation from a rough grass
field, leave the wheel pants off and use 2-3/4" or 3" main
wheels. To save weight, we recommend using lightweight
foam rubber wheels.
OTHER ITEMS REQUIRED
Four-channel radio with 4 servos
Propellers (see engine instructions for recommended size)
Spinner (2-1/4" diameter)
Fuel Tank (10 or 12 ounce)
3/32" Wheel Collars - 2
Iron-on Covering Material (red & white for scale)
1/16" and 1/8" Striping Tape (blue for scale)
Silicone Fuel Tubing
Wing Seating Tape (or silicone sealer... see instructions)
Latex Foam Rubber Padding (1/4" thick)
Dubro "E-Z Connector" (optional)
SUPPLIES AND TOOLS NEEDED
2 oz. Thin CA Adhesive
2 oz. Medium or Thick CA Adhesive
2.5 oz. 5-Minute Epoxy
2.5 oz. 30-Minute Epoxy
Hand or Electric Drill
Sealing Iron
Heat Gun
Drill Bits: 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32".
11/64". 3/16", 13/64". 7/32", and 1/4"
Hobby Saw (Xacto Razor Saw)
Xacto Knife. #11 Blades
Pliers
Screw Drivers
T-Pins
Straightedge
Masking Tape
Sandpaper (coarse, medium, fine grit)*
T-Bar Sanding Block (or similar)
Waxed Paper
Lightweight Balsa Filler
1/4-20 Tap, Tap Wrench
Vaseline Petroleum Jelly
Isopropyi Rubbing Alcohol (70%)
Dremel Moto Tool or similar (optional)
*NOTE: On our workbench, we have four 11" T-Bar
sanders, equipped with #50, #80, #100 and #150-grit
sandpaper. This setup is all that is required for almost
any sanding task. We also keep some #320-grit wet-or-
dry sandpaper handy for finish sanding before covering.
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