3
OUR RECOMMENDATIONS
RADIO SYSTEM
The Wattage Whisper will require a minimum 3 channel radio control system that includes two servos. For this
we recommend the Hitec Focus 3 channel radio with two standard servos. If you already own a radio system, or
want to purchase a radio system that will be more upgradeable in the future, a four or more channel radio with
two standard servos will work fine. Our recommendation would be the Hitec Flash 4X FM Computer radio.
This is a very good system that offers the ability to grow as your experience grows. A standard size receiver will
fit in the Whisper with no problems, so the purchase of an aftermarket micro or mini receiver is unnecessary.
MOTOR CONTROLLER
To operate the motor, we highly suggest using a proportional electronic speed control that features B.E.C. cir-
cuitry, auto-cutoff and a brake. B.E.C. circuitry allows you to eliminate the receiver battery and uses the motor
battery to control both the motor and the servos. Eliminating the receiver battery provides a great weight savings
which effectively increases performance. The auto-cutoff feature turns off the motor when the voltage in the
battery drops too low to operate the radio system safely. This guarantees safe operation throughout the entire
flight. The brake feature electronically causes the motor to stop rotating allowing the folding propeller to fold
properly. This will prevent excessive strain and current draw in the electronic components, specifically the
motor controller. To obtain all of these features, we suggest using one of the Wattage Electronic Speed Controls
available for 540 and 05 size motors. If you opt not to use a proportional electronic speed control, an electronic
switch such as the Hitec Motor Controller SP-1003 (part # 41003) is an economical way to turn the motor on and
off. This switch does not offer any proportional speed, only off or full power.
MOTOR BATTERY
The battery you choose should be a 7 cell (8.4v) Nickel Cadmium battery pack. Choose a battery pack between
1100Mah and 2000Mah. A premade R/C car battery such as the Trinity 1400Mah flat pack (part # 842010)
works very good. A 6 cell battery pack will fly the Whisper, however climb out will be slower than if you use a
7 cell pack. Today's new generation of Sub-C 3000Mah Nickel Metal Hydride batteries also perform well,
however require a linear charger featuring adjustable peak cutoff voltage.
BATTERY CHARGER
Because the battery powers both the motor and the radio system, we suggest using an automatic Delta Peak
charger such as the Promax Black Widow Peak Charger (part # 35036) or the Promax Activator Digital Peak
Charger (part # 885650). It is vital to the Whisper's flying performance that the battery pack be fully charged
every flight, so using a peak charger is very important.
METRIC CONVERSION CHART
To convert inches into millimeters: Inches x 25.4 = MM
1/64”
=
.4mm
1/32”
=
.8mm
1/16”
=
1.6mm
3/32”
=
2.4mm
1/8”
=
3.2mm
5/32”
=
4.0mm
3/16”
=
4.8mm
1/4”
=
6.4mm
3/8”
=
9.5mm
1/2”
= 12.7mm
5/8”
= 15.9mm
3/4”
= 19.0mm
1”
= 25.4mm
2”
= 50.8mm
3”
= 76.2mm
6”
= 152.4mm
12”
= 304.8mm
18”
= 457.2mm
21”
= 533.4mm
24”
= 609.6mm
30”
= 762.0mm
36”
= 914.4mm
The following items are our recommendations to help you in deciding which types of accessories to purchase for
your new Whisper. We have tested all of these items, and many others with the Whisper, and found that these
will offer the best in performance, reliability and economy.
