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The recommended RimFire .32 is rated for 50 A constant
current and 80 A surge current, so you want to load (prop)
the motor to operate within that range. The closer to 50 A the
longer you can fl y full-throttle and the closer to 80 A the less
you can fl y full-throttle until the motor gets too hot.
For starters, an APC 13 x 8 E (on a 4S LiPo) draws about 58 A
static and momentary, maximum peaks of about 50 – 55 A
in the air, but averages a little less than 20 A with "normal"
throttle use. This is a suitable propeller choice and fl ies the
Zero well—it can be zoomed around boreing holes in the sky,
or cruise at lower throttle settings for more scale-appearing
fl ight and extended air time.
We've also fl own the Zero with a 13 x 10 E on 4S which peps
up the Zero noticeably. Then, the static current rises to about
68 A with momentary, maximum in-fl ight peaks up to around
70 A and averages around 50 A with normal throttle use. The
13 x 10 E is another suitable propeller, but prudent throttle
management must be used so as not to overheat the motor
and if necessary, it may be a good idea to allow the motor
to cool between fl ights.
Finally, we fl ew the Zero on a 12 x 12 E prop. It produces
about the same numbers as the 13 x 10 E, but the Zero fl ies
a little faster and loses a little thrust.
With all the props, fl ight time depends greatly on how you
use the throttle. Average current draw can be as low as 13
Amps up to as high as 50 Amps if you're REALLY hard on
the throttle.
In any case, use a fl ight timer initially set to a conservative
time (4 minutes for example). When the timer sounds, land.
Resting (unloaded) voltage should not be below 3.75V/cell
measured with a volt meter after you land. When you charge
the battery note how much capacity it took to recharge
(indicating how much was used for the fl ight). Strive to use
no more than 80% of the battery's capacity. Adjust your timer
according to the voltage and capacity used for the fl ight.
You can also use the worksheet on page 23 to determine
optimum fl ight times based on your fl ying style and battery
capacity.
CAUTION: Never run the motor on the ground for more
than a few seconds. Otherwise, you may overload the
motor, battery or ESC.
Battery Precautions
Before mounting the motor and setting up the ESC and
battery, read the following important battery precautions:
IMPORTANT: If using multiple battery packs that are
connected with an adapter, never charge the batteries
together through the adapter. Always charge each
battery pack separately. Charge the batteries, then read
the following precautions on how to connect multiple
packs for fl ying the model:
Battery Precautions:
There are two ways to connect multiple battery packs: In
Series and in Parallel.
These are two 3200 mAh batteries (one 11.1 V and the
other 7.4 V ). When joined in SERIES, the result will be
a 18.5 V, 3200 mAh battery.
This is a SERIES battery adapter
that connects two batteries in series.
1. Connecting batteries in "Series" means to connect the
+'s to the –'s and the –'s to the +'s. This combines the
battery's Voltages, but the capacity remains the same.
These two 1500 mAh batteries (both 11.1V) are being
joined in PARALLEL. The result will be one 11.1V,
3000 mAh battery.
11.1V
(3-Cell) 1500 mAh
This is a PARALLEL battery adapter that
connects two batteries in parallel.
11.1V
(3-Cell) 1500 mAh
2. Connecting batteries in "Parallel" means to connect
the +'s to the +'s and the -'s to the -'s. This combines the
battery's capacities, but the Voltage remains the same.
19
11.1V
(3-Cell) 3200 mAh
7.4V
(2-Cell) 3200 mAh
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