MULTIPLEX Kit ParkMaster 3D Operations Instructions download pdf (Page 13)

The basics of flying - using a model aircraft as an example

Any aircraft - full-size or model - can be controlled around three primary axes: the vertical (yaw) axis, the lateral (pitch) axis and the

longitudinal (roll) axis. Operating the elevator produces a change in the model’s flight attitude around the lateral axis (nose up

or down). External influences such as air turbulence constantly tend to divert the model from its intended flight path, and it is the

pilot’s job to control the model actively in such a way that it flies where he or she wants it to. The aircraft’s altitude is controlled

using the power system (motor and propeller). In our models the rotational speed of the propeller is usually controlled

proportionally by means of an electronic speed controller. Although applying up-elevator will make the model climb, it is important

to understand that it will also make it slow down, i.e. the aircraft will only continue to climb until its airspeed falls to the minimum

flying speed (stall speed). Opening the throttle (increasing power) will enable the model to continue climbing, i.e. the power of

the motor dictates the maximum climb angle.

The wing section

The wing features a cambered cross-section (known as an

airfoil) which affects the air as it passes through it: within a

given space of time, the air flowing over the wing has to cover

a longer distance than the air flowing under the wing. This

generates a low-pressure area on the top surface of the wing

which tends to create lift, holding or raising the aircraft in the

air. Fig. A

The Centre of Gravity

If your Mentor is to fly safely and stably it must balance at the

correct point - just like every other aircraft. It is absolutely es-

sential to set the correct CG (balance point) before you fly the

model for the first time.

The stated CG position is measured from the root leading

edge of the wing (on either side of the fuselage). Support the

model on your fingertips at these points, and it should balance

level. Even better: use the MPX CG gauge, # 69 3054. Fig. B

If necessary, adjust the position of the flight battery until this is

the case. If you still cannot set the balance point correctly, add

ballast (lead, plasticene, modelling clay) to the nose or tail to

correct it. If ballast is needed, fix it very securely. If the model is

tail-heavy, the ballast must be fixed in the fuselage nose. If it is

nose-heavy, the ballast is fixed at the tail end of the fuselage.

The longitudinal dihedral (difference between the wing and

tailplane incidence) is also important. Provided that you attach

the wing and tailplane to the fuselage exactly as described in

these instructions, this parameter will automatically be correct.

If both these settings - centre of gravity and longitudinal dihedral

- are correct, you will have no problems flying the model, and

the test-flying process will be straightforward. Fig. C

Control surfaces, control surface travels

The model will only be able to offer safe, accurate flying

characteristics if the control surfaces move freely, deflect in the

correct directions, and move to the appropriate angles. The

control surface travels stated in the building instructions have

been established as a result of practical flight testing, and we

strongly recommend that you keep to them - at least initially.

You may wish to adjust them later to suit your style of flying,

and this is a straightforward procedure.

Transmitter control function arrangements

The transmitter is fitted with two primary sticks which control

the servos in the model; the servos in turn move the control

surfaces. The arrangement of the control functions shown here

corresponds to Mode A, but other stick modes are possible.

The transmitter is used to operate the control surfaces as

follows:

The rudder (left / right) Fig. D

The elevator (up / down) Fig. E

The ailerons (left / right) Fig. F

The throttle (motor off / on) Fig. G

The throttle (motor control) stick must stay in the set position

by itself, i.e. it must not be self-centring. For this reason the

throttle stick is usually set up with a ratchet. If your transmitter

is not set up in this way, please read the operating instructions

supplied with the RC set to find out how to set up the throttle

ratchet.

Lateral (pitch)

axis

Vertical (yaw)

axis

Longitudinal (roll)

axis

Elevator

Tailplane

Fin

Rudder

Right wing

Left wing

Fuselage

Canopy

Aileron left

Aileron right

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MULTIPLEX Kit ParkMaster 3D Operations Instructions Page 13

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