Choosing a power system:
Power system can be chosen based on the type of flying ex-
pected of the model and all up weight of the aircraft. Sedate flying
from a hand launch requires 35 watts per pound(W/Lb). Taking off
the ground needs approximately 50W/Lb. Aerobatics and good
climb performance, 75W/Lb. Anything more than 75W/Lb will
result in excellent performance. Based on the weight of the model
and the flying desired, the power require can be calculated. Se-
lect the voltage of the battery being used. It is best to use a loaded
voltage of about 90% of nominal. Now, calculate the current re-
quired. From the chart, pick a motor at the voltage you intend to
use and find the prop that pull the required current.
Propeller selection:
Use the chart to start with propeller selection. It is a starting point
and we recommend testing several props on the model to find the
best performing prop.
Verify current draw when testing props.
A 3D model will use a prop very different than a model intended to
fly very fast. Generally, 3D models will use a prop that has a pitch
to diameter ratio(P/D) of 0.5 or less, like 10x5 or 12x5. Most sport
models will use a prop with a P/D or 0.6-0.8. Models that are
designed to fly at high speed or have other special requirements
will use props in the 1.0 P/D range. The highest static thrust will
be available from the 0.5 P/D props, but they have limited top speed.
Highest speeds can be attained with 1.0 P/D props, however low
speed thrust and acceleration is limited.
Warranty:
Himax motors have a two year limited warranty to the original
owner, excluding gearboxes. All motors are guaranteed to be free
from manufacturing defects within two years of date of purchase.
Not covered under warranty is crash damage, customer abuse,
improper use, or overheating. Warranty claims should be handled
directly with Maxx Products, 815 Oakwood Rd, Unit D, Lake Zurich,
IL 60047. Be sure to include contact information and a descrip-
tion of the problem including which ESC, battery, and prop was
being used. If possible visit www.maxxprod.com to obtain a ser-
vice form.
Service:
Himax motors in need of service should be sent to Maxx
Products, 815 Oakwood Rd, Unit D, Lake Zurich, IL 60047.
Please include a note explaining the problem. Return shipping
for repair estimates must be prepaid.
Removing or Reversing the Shaft:
1. First of all, never use a hammer or heavy object to pound or tap
on the motor. Sharp impact will damage ball bearings and other
components.
2. Use an allen wrench to remove the setscrews in the endbell
and the wheel collar. The setscrews may be tight because
thread locker is used to secure them.
3. Separate the stator assembly and rotor assembly. This may be
tight because thread locker sometimes seeps between the shaft
and ball bearing.
4. In order to maintain critical balance, the shaft fits tightly in the
rotating endbell. Use an arbor press or drill press to exert steady
pressure to push it out of the endbell. Before applying pressure,
make sure the press and shaft are aligned. Avoid using a vise
because it is difficult to maintain proper alignment with a vise.
5. There are flats on the shaft. Align the flats with the set screws,
and tighten.
6. Put the rotor and stator assemblies back together and reinstall
the wheel collar. If you wish to use thread locker, use only a
removable type.
Maintenance:
Brushless motors are almost maintenance free, so minimal care
is required for long life. Keep the motor clean free of dust and dirt,
especially the bearings. Dirty bearings wear quickly. Lubricate
the bearings regularly with light oil. Do not immerse the motor in
water, or solvents. Do not bend the wires excessively and secure
wires to prevent breakage due to fatigue from vibration. Always
used balanced propellers to reduce loads on bearings, to reduce
noise, and reduce stress on the airframe.
Reading the Chart
The graph represents the HC3510-1540
operating range. Current ratings are noted
on the front of this manual. The suggested
props are not a recommendation for any
specific airframe or flying style. The graph
does give a range of props to work with and
an idea of the current draw. The chart as-
sumes APC Electric series propellers. First,
approximate the operating voltage, 1-1.1
volts per NiXx cell or 3.3 volts per Lithium
cell. As an example we are using an 8 cell
NiMH pack. 8x1.1= 8.8V. Follow along the
9V line up the chart. If using a 9x4.5 prop
this motor will draw approximately 33A, a
little less at 8.0-8.8V. This would be accept-
able for full throttle continuous flight. If a
9x6 prop were used, current would be about
40A. This would allow 15 second bursts of
full throttle with enough power off time to
allow the motor to cool.
