Page 3
Rev 508jf
EQUIPMENT SELECTION
Engine: The Pacific 27% Gee Bee “Y” is very light for it’s size and it will fly very well with a mid-
size gasoline engine. It was designed to use a classic, heavy 43 to 62cc engine (with tail-weight
added), or one of the new, light 40 to 50cc engines, (with nose weight added). NOTE: Using an
engine larger than the top of this range could overstress the airframe. It will also void your warranty.
Propeller: The cowl is 12” in diameter. You will probably want to use at least a 20” diameter
propeller to generate enough thrust outside the cowl.
Cooling: Do not omit the dummy engine. Leaving the cowling fully open will slow down the air
that passes over the engine and could cause your engine to overheat.
Safety: The first and second most common causes of in-flight radio failure are the battery and the
switch. We STRONGLY recommend that you install dual batteries and dual switches in any giant
scale model. Many events and clubs are now requiring a throttle-down failsafe in all giant scale
models. We agree. If you have a PCM radio, make sure the failsafe is set for low throttle, and if you
are using FM (PPM), get and use one of the new after-market failsafe devices.
Servos: You will need 6 or 7 servos. The aileron and elevator servos should have at least 70 oz/in
of torque. The rudder servo should have at least 100 oz/in of torque. Use proper mechanical linkage
setup to get the control travels you need. Using your transmitter’s EPA function instead of the
proper mechanical setup to reduce the travels will also reduce the effective torque of your servos and
may invite control surface flutter, possibly resulting in loss of control of the airplane.
Servo extensions: You will need (2) 12” extensions, (2) 18” extensions and (2) 24” extensions. If
you use one channel for both elevator servos, you will also need (1) reversing “Y” adapter.
Spinner: The full scale Gee Bee “Y” did not use a spinner. It had a large bullet shaped prop hub
instead. The closest thing we have found that will fit the 27% Gee Bee is the Tru-Turn # TTH-1750-
A prop hub. This hub is available from Tru-Turn or Pacific.
ASSEMBLY INSTRUCTIONS
REMOVE THE CONTROL SURFACES FROM THE WINGS, STABILIZER AND
VERTICAL FIN. The factory has temporarily attached the control surfaces, but
the hinges are
not glued in place
. This is done to make it easier to re-shrink the covering if necessary, and also
so that you can be SURE that the hinges are glues in properly. The first assembly step is to
detach the control surfaces and remove the hinges.
NOTE
that one of the hinges in each aileron
has been shortened. This hinge goes in the position closest to the tip and the short end goes into
the aileron.
RE-SHRINK THE COVERING. If we could control the weather, we could make sure that the
covering wouldn’t bubble and sag after you take the parts out of the bags. But we can’t, and the
temperature and humidity at our factory are probably different from where you are. This makes
bubbles and sags almost inevitable. First, use a covering iron to go over the seams and color
separations. (
NOTE:
Keep the iron away from the flat black “NR 718 Y” on the wing and
rudder. It is low temp material and high heat will distort it. The glossy black trim is normal,
