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Li-Po Battery
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1000 to 1350 mAh
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2S (7.4 volt) or 3S (11.1 volt)
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20C or higher recommended
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130 grams (4.5 oz.) maximum weight
APC 7x5 Thin Electric Propeller (APC p/n LP07050E)
Qty (3) 6 to 8 gram (0.2 to 0.3 oz) ultra-light servos
Qty (3) micro control horns
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Du-Bro #919 or #848 Micro Control Horns or equivalent
Qty (3) micro control horn keepers
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Du-Bro #849 Micro EZ Link for .032 wire
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Du-Bro #920 Micro EZ Link for .047 wire
.032” or .047” diameter wire
Qty (1) 6” servo extension for the elevator servo - 32 gauge micro wire preferred
Qty (1) “Y” harness for aileron servos or (2) 3” servo extensions if your receiver
allows one aileron servo to be plugged into an alternate channel - 32 gauge micro
wire preferred
(4) #64 rubber bands (#64 Rubber bands are available at any office supply store.)
Hinge Tape
Velcro or double-sided tape
2” or 3" wide strapping tape
5-minute epoxy
Foam safe thick CA and/or low-temp hot glue
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Caution: Foam safe thin CA will generate too much heat when it cures
and will melt the foam
Introduction:
The BLUE RAY is intended to be a simple-to-build club project. Micro servos, receivers
and electric motors are available at very affordable prices. Now is the time to start club
pylon racing!
The completed weight of the BLUE RAY is 8 to 8.5 ounces (228 to 240 grams) without a
battery! The battery adds from 2.2 to 4.0 ounces (62 to 115 grams) for a total ready-
to-fly weight of 10.2 to 12.5 ounces (310 to 355 grams). Typical foamy planes in this
weight class do not do fly well in the wind; however the BLUE RAY handles well in a 10
mph breeze. It has good wind penetration, especially with a 3-cell battery and the
throttle up.
A 1000 to 1300 mAh battery is recommended for racing. A smaller battery can be
used, but the flight duration is shorter. With the recommended battery, you can get 3
two-minute heat races with a single charge. The BLUE RAY has been flown with a 1700
mAh 3-cell Li-Po battery and it still flies well, but pylon turns get to be sluggish.
If this is to be a club project, the simple fixtures shown in these instructions will make
the assembly quicker and easier. If you are only building one or two airplanes,
assemble the fuselage on a flat surface and use a carpenters square or right triangle to
make sure the fuselage sides are perpendicular with the fuselage bottom.
