Handleiding Graupner MC16 (pagina 70 van 104) (Engels)

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Throttle and Collective Pitch curves:

Practical Procedure

70 Helicopter

Basic Adjustment

Although the pitch and throttle curves can be set

electronically over a wide range in the mc-1620

transmitter, the hovering point of the helicopter

should be at least approximately correctly preset

mechanically (see introduction). If you pay attention

to the instructions of the respective helicopter kit for

adjusting the controls this is usually the case.

The control of the carburettor must be so adjusted

such that the throttle servo can move during

operation of the throttle control stick, (including both

end positions of the trim lever), over the full travel,

without the carburettor hitting a mechanical stops.

The carburettor must be completely open with the

control stick in the full power position, and with the

control stick and trim at the lower end the carburettor

should be completely closed, without the servo

stalling.

This setting should be achieved as best as possible

mechanically by adjusting the control linkages and

changing of the position on linkages on the servo

and carburettor horns.

Only the remaining small adjustment should

thereafter be made electronically, with the servo

travel setting (“TRV ADJ”, “CH1”). This basic

adjustment is the basis for all further settings and

must therefore be completed as accurately as

possible.

With this basic adjustment the engine should be able

to be started and the idle speed adjusted using the

trim lever.

The model should then with the throttle / collective

pitch control stick in central position, take off and

with the intended RPM hover.

If that is not the case, then one proceeds as follows:

1.) The model takes off only with the stick

above the central position.

a) The rotor RPM is too low

Remedy: Using the “TM…” setting open

the carburettor slightly at the stick central

position.

b) The rotor RPM is too high

Remedy: Using setting “PM...”, increase of

the blade angle (collective pitch) for the

stick central position.

2.) The model takes off with the stick below the

central position.

a) The rotor RPM is too high

Remedy: Using the “TM…” setting close

the carburettor slightly at the stick central

position.

b) The rotor RPM is too low

Remedy: Using setting “PM...”, decrease of

the blade angle (collective pitch) for the

stick central position.

WARNING:

A long time should be taken over this setting,

ensuring the model hovers at the correct RPM with

the throttle / collective pitch expensive stick in the

central position. The correct execution the remaining

model parameters is dependent on this!

Climbing Flight Setting

The combination of the options “TM...” (hovering

flight throttle) with “PHN” (maximum collective pitch)

and “PMN” (hovering collective pitch) it makes

possible to achieve problem-free flight from hovering

to maximum climb rate with a constant rotor RPM.

To do this, proceed as follows:

First perform a long vertical climb, with the collective

pitch stick in it’s end position. Whilst doing this the

rotor RPM should not change relative to that during

hovering flight. This is dependent on the power of the

engine and on the model weight. If the rotor RPM

drops in the climb and the carburettor is already

completely open, thus no further increase in output

power is possible, using “PHN” (maximum collective

pitch) reduce the maximum blade angle; with rising

rotor RPM in the climb, increase the value of “PHN”.

If this setting is correct, bring the model back to

hovering flight, which should be achieved with a

central position of the collective pitch stick.

If the stick position for hovering flight has moved

away from centre towards the maximum point,

compensate for this using “PMN” (hovering collective

pitch), by increasing it’s value, until the model hovers

with the stick in the central position. In the opposite

case, with the model hovering with the stick below

the central position, the value of “PMN” is reduced

accordingly. It may also be necessary to reduce the

setting of “TM…” (hovering flight throttle), until an

constant rotor RPM for hovering flight and climb

results.

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