Handleiding Graupner MC 22S (pagina 153 van 180) (Engels)

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Programming examples – Model helicopters

done so, adjust the mechanical linkages to the rotor

head so that all the blades are set to a collective pitch

angle of 4° to 5° positive for the hover. All known heli-

copters will ﬂ y at this approximate setting.

Now push the collective pitch stick fully forward to the

maximum collective pitch point (we have already set

collective pitch minimum to the “back” position). The

solid vertical line in the graph indicates the current

stick position. You can now adjust this point “H” (high)

on the collective pitch curve using the rotary control,

with the aim of producing a collective pitch maximum

setting of around 9° at the main rotor blades. Point “H”

will need to be around 50%.

Note:

A rotor blade set-up gauge, e.g. the GRAUPNER

item, Order No. 61, is very useful when setting up bla-

de pitch angles.

Now pull the collective pitch stick right back to the col-

lective pitch minimum position: point “L” (low). Set the

blade pitch angle for this setting to 0° to -4°, depen-

ding on the pilot’s ﬂ ying ability. This process produces

a slightly “bent” line (known as the “collective pitch

curve”) at the hover point, and the graph may well

look something like this:

P it c h

I n p u t + 5 0 %

C u r v e O u t p u t + 2 5 %

o f f P o in t

At this point you should round off the curve by simply

pressing the left ENTER button again.

If you now switch to the auto-rotation phase – you will

see the name of the ﬂ ight phase “Autorot” at the bot-

tom of the screen – you will ﬁ nd the “old” collective

pitch curve once more. In this phase you should set

the same values as in the normal phase, with the fol-

lowing exception: increase the collective pitch ang-

le by about 2° at “H”, i.e. the extreme forward position

of the stick. This gives slightly more rotor blade pitch

for ﬂ aring the model when practising “autos” at a la-

ter (!) date.

Once you have set up the collective pitch curve, press

ESC to return to the Helicopter mixers menu list, and

move to the “Channel 1  throttle” line where you

can set up the throttle curve.

The ﬁ rst step here is to deﬁ ne the idle trim range by

adjusting point “L” on the throttle curve; it should be

set to around -65%.

With the throttle limiter closed and the idle trim fully

open, pull the collective pitch stick to the “fully back”

position, and move it slightly to and fro. The thrott-

le servo should not respond to this movement. This

arrangement gives you a seamless transition from

idle trim to the throttle curve. You will probably need

to make further adjustments to the throttle curve, but

this must be carried out later as part of the ﬂ ight-tes-

ting process.

If you temporarily switch from this graphic display to

the auto-rotation ﬂ ight phase (AR), the display “Chan-

nel 1  throttle off” appears, i.e. the throttle servo is

switched to a ﬁ xed value which can be set up as fol-

lows:

Select ESC to return to the menu list. You will ﬁ nd that

certain new sub-menus now appear in the list, but

only as long as you stay in the auto-rotation phase.

The new menus are:

P it c h = >

T h r s e t t in g A R

- 9 0 %

T a ilr o t o r o f f s e t A R 0 %

G y r o s u p p r e s s io n 0 %

S w a s h p la t e r o t a t io n 0

« A u t o r o t »

The important line here is “Thr setting AR”. The va-

lue on the right of this line should be set to either ap-

proximately +125% or -125%, depending on the di-

rection of rotation of the servo. If you are not sure of

this, call up the »Servo display« menu to help you.

This setting ensures that the motor is reliably stop-

ped in the auto-rotation phase (to cope with an emer-

gency). Later, when you have gained sufﬁ cient expe-

rience to practise auto-rotation landings, the setting

should be changed to a value which provides a reliab-

le idle.

At present the remaining sub-menus are of no impor-

tance. Switch “AR” off, and we move back to the ﬁ rst

menu list.

Call up the “Channel 1  tail rotor” line, in which you

can set static torque compensation for the tail rotor.

Here again, it is better to keep to just three reference

points; anything more elaborate is strictly the province

of experienced pilots. For the moment you can safe-

ly accept the pre-set values of “L” = -30% at the bot-

tom end of stick travel and “H” = +30% at the opposite

end, although you may ﬁ nd it necessary to correct the

settings slightly later.

Now switch back to the AR phase for a moment. The

set-up curve is disabled here, with the result that the

tail rotor servo no longer responds to collective pitch

commands (when the main rotor is not powered, the-

re is no torque to be corrected). All the other sub-

points are of no importance for the moment.

If your gyro features gain control from the transmitter

– unlike the model we are using in this example – you

can safely store the standard gain value in the mo-

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