User Manual

3. System check.
4. Fine Tuning:
5. Maintenance:
6. Replacement Parts:
Part Number Description
Select phase 1 and carefully open the throttle. The motor should accelerate as usual with a
conventional prop set-up and provide positive thrust. Attention: For best performance it is
recommended to measure the motor current and to adjust the maximum pitch setting to avoid
exceeding battery / motor limits.
To check phase 2, start your system in phase 1 and run it up to full throttle. Switching to phase 2
should not cause any changes. Moving the throttle stick slowly towards the mid position should
reduce the prop rpm, reaching the minimum in mid position. Further movement of the stick should
cause the motor to spin faster again, but now the prop should start providing negative thrust. Prop
rpm should be about the same at positive and negative throttle / pitch settings.
After initial flight tests, you may want to re-adjust the maximum pitch values for best performance.
Raising the bottom of the V-shaped throttle curve in phase 2 will prevent the motor from stopping
completely at zero pitch setting. More kinetic energy will remain stored in the prop system, and initial
reaction on pitch changes are more aggressive.
Warning: Never run the motor at high power level and low pitch. Max. prop rpm must never exceed
10.000rpm.Changes to the set-up should be done in small increments and the results monitored
carefully.
Keep yourself and others away from the path of rotating blades. Never re-use a damaged, nicked or
bent prop.
Some of the design goals for the UPSIDEDOWN VP-Prop System were robustness and low
maintenance. In order to reduce the shock loads on the props mechanics and the pitch servo when
hitting the ground or walls, the high tensile blade screws (M2 x 12mm) are designed to bent. Even
light ground contact can cause extreme loads at high the prop rpm! Always check for vibrations.
Vibrations usually indicate that the blade screws are bent. Replacing the screws doesn’t take long
and should fix x the problem immediately. Vibrations can also be a sign of some mechanical damage
and / or a bad set-up. While the prop usually won’t fail under these conditions, a weak or damaged
fuselage / motor mount often does.
Ensure that your model is up to the job!
We hope that you will have fun exploring the new dimension of flight! (4D)
MAOUSD8 8" blades with (2) 2.0mm x 12mm screws
MAOUSD9 9" blades with (2) 2.0mm x 12mm screws
MAOUSDSPARE1 Plastic housing, holder and ring
MAOUSDSPARE2 Pitch arm / holder with (1) 1.5 x 4mm bearing and 1.5mm screw
MAOUSDSPARE3 2x5mm blade ball bearings (4)
MAOUSDSPARE4 Carbon mount (1 piece)
MAOUSDBLMOT BL-Outrunner Motor 1300KV 33g
DUB2114 2.0mm x 12 socket head cap screws (4)
Distributed exclusively in the US by Horizon Hobby, Inc.