.
Additional Items Needed
The following items are not supplied in this kit but are needed to complete the airplane. Because of the wide variety of brands
available and the influence of local preferences, the final choice of these items is left to you. In most cases, we will list what
worked well for us in our prototype models. You should select equivalent items.
BRUSHLESS OUTRUNNER ELECTRIC MOTOR
200-300 watts with a kv specification suitable for turning a 9x6E propeller. Motor should also include prop adapter
hardware and a radial-style motor mount.
ELECTRONIC SPEED CONTROL (ESC)
3S1P LITHIUM-POLYMER BATTERY PACK
1800-2400 mAh
BATTERY CHARGER
For maximum performance from your battery pack, you MUST use a proper battery charger! Make sure your charger is
designed for the type of cells in your battery pack. Using the wrong battery charger can be very dangerous! We
recommend that you use a quality peak detection lithium-polymer battery charger with cell balancing.
SPINNER (if desired)
2" to 2-1/4" diameter spinner is optional. You could also use an "acorn" style prop nut alone. Your choice.
2-1/4" dia. MAIN WHEELS
4-CHANNEL RADIO CONTROL SYSTEM with 4 SERVOS
"Standard" size radio gear is not recommended for an airplane as small as the Four-Star 20EP. The Four-Star gets its
great flight performance from many factors, but two of the most important factors are its light weight and generous wing
area. The lighter the final weight is, the better this airplane will fly! The radio equipment you install will have a great effect
on the flight performance of your airplane. Maximum performance can only be achieved with light weight components.
RECEIVER
a small or micro size receiver should be used in this model. In our flight tests we have used the Hitec
Electron 6 (weight: 19 grams) and the FMA M5 (weight: 11 grams). Both are dual conversion receivers.
SERVOS
standard size servos, the ones that come with most sport radio systems, are too big and too heavy for the
Four-Star 20EP. You will need smaller servos. In our prototypes airplanes, we used Hitec HS-81 Micro Servos, which
have a torque rating of 36 oz/in and weigh .58 oz each. Any other brand of servo that is in the same size and torque
range will also work just fine.
SERVO CHORDS
You will need one Y-Harness chord to connect the two aileron servos together inside the wing.
Every radio manufacturer has Y-Harness chords available for their radio systems. If they have an option for a short Y-
Harness or a long Y-Harness, you can probably use the short one due to the small size of the airplane. In addition,
you will also need a short standard Servo Extension Chord to plug into the receiver and connect to the aileron Y-
Harness.
COVERING MATERIAL
Any brand of quality iron-on plastic covering material is suitable for the Four-Star 20EP. If the manufacturer has a
"lite" version, use it to save a little weight. The color choice is entirely up to you. It will take approximately 1 to 1-1/2
rolls of covering material to cover the Four-Star 20EP, depending upon how many colors you elect to use.
Matched to your motor - typically 35 amp.
* We use and recommend the Maxx Products Co. Combo 19A
(www.maxxprod.com), which is a packaged motor system that includes
their Himax 3510-1100 Brushless Outrunner Motor, a Castle Creations
Thunderbird 36 amp ESC, a radial motor mount, an APC 9x6E
propeller, a prop adapter, and mounting screws.
Himax 3510-1100 Motor specs:
Diameter
35.2mm (1.39")
Length
32.2mm (1.27")
Shaft Diameter 4.0mm
Weight
89g (3.1 oz.) motor only
Max. Power
250W
Kv=1100 Rm=.055 lo=1.2
Any other brand of outrunner motor and speed control of equivalent
size and specifications would also work.
Summary of Contents for Four-Star 20EP
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