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ROYAL evo 7 - Instructions

Page 57

ENGLIS

3. The value for tail rotor compensation for climb can

now be set using the

Coll.+ parameter.

Move the collective pitch stick to the “climb” posi-

tion (collective pitch maximum) and set an initial

value at which the distance between the tail rotor

blade tips is approximately doubled.

Now move the collective pitch stick to the “de-

scend” position (collective pitch minimum) and set

an initial value at which the distance between the

tail rotor blade tips is about 0 … 5 mm.

For the other flight phases start with the values you

have just set. Fine adjustment of tail rotor compen-

sation (

Coll.+, Coll.-) for the individual flight

phases can only be carried out during flight-testing.

In the Auto-rotation flight phase (

AUTOROT) no tail rotor

compensation is required, as there is no torque to be

allowed for since the motor is either stopped or idling.

Set the value

OFF for the Coll.+ and Coll.- para-

meters. Set the

Offset parameter so that the tips of

the folded tail rotor blades are in line with each other

( blade pitch angle 0°).

Step

w Setting up and testing the gyro

The model templates are designed on the assumption

that a gyro system (normal / damping or heading-hold

type) - nowadays a standard feature - is used, with gyro

gain remotely variable from the transmitter via a sepa-

rate channel.

In the

HELImech and HELIccpm model templates the

simplest method of gyro gain control is selected for the

ROYALevo 7; this is the gyro mode

Control (Î

15.6.1.). This provides for manual adjustment of gyro

gain (same gain for all flight phases) using the

Gyro

control (slider “E”). Later you can set up flight phase de-

pendent gyro control (

Damping or Heading mode).

The first step here is to determine the position of the

Gyro control at which maximum gyro gain is obtained.

This is done by moving slider “E” to one end-point and

rotating the model around its vertical axis. At maximum

gain you will see the largest corrective tail rotor move-

ment. If maximum gain is at the opposite position of the

slider, the direction of the Gyro channel must be “re-

versed” (Î 16.1.1.).

The optimum gain settings for the gyro can only be

found through flight testing. For initial test-flights we

recommend a gain of around 50%. Increase the gain

gradually during the first few flights until the tail starts

to oscillate. You should then reduce gain just to the

point where the oscillation ceases. This is the optimum

gyro gain setting.

! Caution!

Before you fly the model it is absolutely essential to

check that the gyro is working correctly, i.e. that it is set

up to correct any unwanted yaw movement. If it is set

up in the opposite direction, the gyro will exaggerate

any yawing tendency, rendering the helicopter uncon-

trollable. Please read the notes on this subject in the

gyro’s operating instructions.

Step

W Getting to know the method of working

of the throttle limiter and direct throttle

Throttle limiter

The throttle limiter function limits the maximum speed

of the motor to a variable value in the range idle to full-

throttle, and thereby makes it much safer to start and

adjust the motor. The control for the throttle limiter is

slider F.

If the throttle limiter is at the idle position, the motor

runs at the speed set using the

Min. parameter (Î

14.1.12.) (the collective pitch stick now has no effect on

throttle). In this position you would, for example, start

the glow motor (idle speed can be adjusted using the

collective pitch trim buttons). Only when the model is

standing on the launch pad at a safe distance, and you

have checked that the collective pitch stick is at collec-

tive pitch minimum, should the throttle limiter be

gradually moved to the full-throttle position. The motor

now accelerates to the set throttle value for collective

pitch minimum (

P1 on the throttle curve Î 14.1.11.).

The throttle curve is now active, and throttle is con-

trolled by the collective pitch stick.

max.

+100%

+50%

min.

Throttle

Collective pitch stick

Range blocked by

throttle limiter

Helicopter throttle curve

Programmed

throttle curve

Actual course

of throttle

! Note: Changing the neutral position

If the throttle limiter is to work properly it is necessary

to set up the neutral position of the Throttle Limit con-

trol to suit your personal preference:

Throttle limit min. (= idle or OFF) forward or back

This setting is made in Menu L

Setup, Control

(Î 13.3.4.).

Direct throttle (DTC = Direct Throttle Control)

For testing and adjustment work the ROYALevo7 offers

the Direct Throttle facility. Direct throttle means that the

motor can be controlled over the range idle to full-

throttle using the throttle limiter, independently of the

collective pitch stick. For example, the motor can be run

up to full speed on the ground for test purposes, and be

subjected to negative collective pitch (collective pitch

minimum) to give it a “load” - keep a safe distance away!

The switch “DTC” (N) is used to activate the direct throt-

tle function.

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