Great Planes Ultra Sport 40 Kit - GPMA0410 - Manual (Page 4)

DECISIONS YOU MUST MAKE NOW
ENGINE AND MOUNT SELECTION
The recommended engine size range is as
follows:
.40 - .46 cubic inch displacement 2-cycle
.60* - .70 cubic inch displacement 4-cycle
*NOTE: Although not included in the
above engine size range, the OS MAX 48 SUR-
PASS also provides sufficient power to fly this
airplane.
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 modification of this mount
is required to mount the OS40SF and OS46SF).
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 Ultra
Sport 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 an 11x9 or
10x10 prop may be the best choices for a 4-cycle
engine.
LANDING GEAR CONFIGURATION
The Ultra Sport 40 may be built with either
a "taildragger" or "tricycle" landing gear
configuration, and a retractable main gear
may be installed if you want to really "clean
up" this airplane for ultra-smooth and precise
aerobatics.
There is not. however, room for a nose gear
retract; therefore, if you want retracts, you'll
have to use the "taildragger" configuration.
OTHER ITEMS REQUIRED
• Four-channel radio with 4 servos (additional channel and
retract servo required if retracts are being used).
• Propellers (see engine instructions for recommended
size)
Spinner (2-1/4" diameter)
Fuel Tank (10 or 12 ounce)
Main Wheels - 2 (2-1/2" dia. for fixed gear. 2-1/4" for
retract)
Nose Wheel -1 (2-1/4" diameter, required fortrike only)
Tail Wheel - 1 (1" diameter, required for taildragger
only)
• 5/32" Wheel Collars - 4 or 6
• 3/32" Wheel Collars - 2 (required for taildragger only)
• Iron-on Covering Material
• Silicone Fuel Tubing
• Wing Seating Tape (or silicone sealer... see instruc-
tions)
• Latex Foam Rubber Padding (1/4" thick)
• Dubro "E-Z Connectors" (or equivalent) - 2
• Main Gear Retracts (Dave Brown 2-Gear Main, or
equivalent)
• Plastic Pilot (Williams Bros. 2" scale) (larger 2-5/8"
scale pilot may be used, but requires modification)
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