MVVS 4.6/840 - Manual (Page 2)

Dimensioned Sketch
A = 54,5mm B = 55,5mm C = 74,5mm
Dimensioned Sketch – SPORT
A = 58,8 mm B = 59,8 mm C = 78,5 mm
Motor Installation into a model
Drill a central hole 13mm in diameter and other holes for motor screws according to the sketch into the
motor bulkhead in the model nose, unless already provided by the manufacturer. In addition, drill at least 4 holes at
least 8 mm in diameter for cooling air supply, so that to be positioned directly opposite to inlets in the face of the
installed motor. Use at least 2 screws M3 for fixation, so that they penetrate min. 5mm and max. 7mm into the
motor. In case shorter screws are used, there is a danger of thread extraction. If longer screws are used, there is a
danger of motor seizure or mechanical damage. When only two screws are used, they should be located
symmetrically to the motor axis. For motors designed to be driven by a combustion engine use the bed for rear
assembly supplied as special accessories. Never forget about holes for cooling air outlet, which is the necessary
condition for correct cooling function!
By the SPORT versions is cooling supply solved thru the back plate and the output is thru the radial
opening on the cover. Here is recommended drilling the holes in vertical grain to the fuselage, so the warmed air
can go away thru the holes on the plane cover. Therefore is necessary cold air intake behind the motor’s back plate.
The rear motor cover is equipped with three connectors 3.5mm in diameter for connecting the motor to
the controller. In case the used controller is fitted with connectors of different diameters, or its female connectors
do not adhere firmly to the motor connectors, replace them with those supplied as motor accessories. Use of
incorrect connectors may cause damage to the motor and controller. Replace any two supply cables if the motor
rotates in the opposite direction.
Use high-quality chuck adapters of 5mm inside diameter for gripping the propeller. If an unsuitable or
poor-quality adapter is used, the rotating propeller may slip off and cause serious injury.
Drive Optimisation
By means of correct choice especially of propeller, accumulator and controller parameters it is possible
to change driving unit properties within wide range and thus flight behaviour and attained flight time. Use data
mentioned in tables as guidance for your decision-making. In case other propeller is used than that mentioned it is
necessary to check max. current using a clip-on ammeter. Use the controller that will supply current values
mentioned in specifications with reserve. We recommend use of the 40 – 55A controller. The regulator advance
should be set to 25° or higher and frequency to 8 kHz. As to supply accumulators do not exceed max. discharging
currents because there is a danger of destruction.
Do not overload the motor unnecessarily because there is a danger of damage or deterioration of
performance parameters. If the motor operates within the range recommended in technical specifications, its
lifetime is limited by mechanical endurance only.
Motor Maintenance
AC electric motors are not maintenance-demanding. The same applies to MVVS motors as well, as
maintenance only involves keeping the motor in dry and clean condition. If no accident happens, motor service life
is only limited by lifetime of bearings in hundreds of hours, depending on flying style and loading. Wear of
bearings shows by increased noise and radial allowance. Every accident may decrease bearing lifetime
significantly. We recommend entrusting the manufacturer with replacement of bearings.
If you decide to replace parts by yourselves, then always use original parts and MVVS tools only.
Note: Screws used for motor installation can be loosened using the Torx 9 spanner. Screws on the
crankshaft should be heated first to approx. 100 °C to disengage locking glue. Cover screws are treated with
special paste against seizure. Never wipe off this material to make possible next disassembly.
Safety Instructions
1)
Use the motor for designed purposes only.
2) When operating models, follow regulations and laws effective in your country.
3) The manufacturer is not responsible for possible damages caused by operation of models and devices driven
by the MVVS motors.
4) Use only original spare parts.
5) Never interfere into the motor structure.
6) Before every flight check tightness of the propeller screw or chuck. If the propeller cone is used, check its
fixation as well. When mounting the cone, always follow appropriate instructions.
7) Check attachment to the motor bed regularly. Never start up loosened motor!
8) Use well balanced propellers only! Immediately replace damaged propellers or propellers that touched the
ground!
9) Never stand so that parts of your body are in the plane with the rotating propeller. Apply the same principle
for bystanders.
10) Never wear loose drifty clothing (tie, scarf, etc) when operating the model.
11) Never try to stop the motor with any part of your body.
12) Before starting the motor secure the model from setting in motion.
13) Keep all small objects in the safe distance from the running motor and never throw any objects into it.
14) When operating the motor, pay attention to keep possible bystanders, especially children, at least 10 m away.
15) Never rectify the axis bent during an accident but provide its replacement. Do not start the motor
immediately after an accident but check it first. The contaminated motor should be delivered to the
manufacturer for repair.