Dremel US40 Instruction Manual download pdf (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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Dremel US40 Instruction Manual Page 4

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