Handleiding Graupner MC 22S (pagina 140 van 180) (Engels)

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»MIX-only channel« (page 108)

M I X O N L Y C H A N N E L

M I X o n l y

n o r m a l

1 2

3 4

5 6

7 8 9 1 0

1 1 1 2

… so that the associated servo is not also operated

by the elevator stick!

Many years ago the author operated a model delta

with the mc-20, programmed exactly in this way, with

a butterﬂ y (crow) system as landing aid, exploiting the

“Brake  5 aileron” and “Brake  6 ﬂ aps” wing mi-

xers to provide complete compensation for pitch trim

changes. In this case the term “ailerons” means the

outboard wing control surfaces, and “ﬂ aps” the in-

board pair of control surfaces. To achieve the same

effect with the mc-22s, move back to the menu …

»Wing mixers« (page 84)

… and enter the values for the up-aileron travel and

the down-ﬂ ap travel in the “Brake  5 aileron” and

“Brake  6 ﬂ aps” lines in such a way that the pitching

moments which occur in ﬂ ight cancel each other out,

Programming examples – Fixed-wing models

i.e. the model’s ﬂ ight attitude remains stable. Howe-

ver, do take care to allow the control surfaces enough

“elbow-room” for the elevator function: this means,

don’t exploit the full servo travel for the butterﬂ y / crow

system alone.

You can ignore all the other settings in this menu.

A modern sweptback ﬂ ying wing can also be opera-

ted in the same way. Many of these models also fea-

ture inboard and outboard control surfaces: the for-

mer forward of the Centre of Gravity, the latter aft of it.

Deﬂ ecting the inboard control surface(s) down incre-

ases lift and produces an up-elevator effect. Deﬂ ec-

ting them up creates the opposite effect. In contrast,

the outboard ailerons have the reverse effect: a down-

deﬂ ection produces a down-elevator effect, and vice

versa. In this case there are really no limits to what

you can achieve with careful thought and the sophisti-

cated mixers of the mc-22s. This could extend to set-

ting up curve mixers which pass just a small degree

of up / down travel to the outboard pair of control sur-

faces, and only at fairly extreme stick travels. For his

own model this writer uses a curve mixer deﬁ ned by a

total of four reference points, i.e.:

In this example the two reference points 1 and 2 are

set to 0%, the left end-point to +60%, and the right

end-point to -65%; the curve is then rounded by pres-

sing the ENTER button.

Please note that you should be extremely careful

when setting differential travel with such a conﬁ gura-

tion, regardless of the type of servo arrangement you

are using. This is because differential travels tend to

produce an asymmetrical elevator effect on a tail-less

model, rather than the desired adverse yaw reduction.

For this reason it is advisable to start with a differenti-

al setting of 0%, at least for the ﬁ rst few ﬂ ights. When

you are familiar with the model and feel the need to

experiment, it may then be feasible under certain cir-

cumstances to try differential settings deviating from

zero.

For larger models it may be advisable to install wing-

lets ﬁ tted with rudders, i.e. small vertical surfaces at

the wingtips. If these are actuated by two separate

servos, the rudder signal can very easily be “split” by

using a mixer in the menu ...

»Dual mixers« (page 110)

… in which case you can also apply “split” or differen-

tial travel, with the second rudder servo connected to

a free receiver output socket. If you have programmed

the “Delta / ﬂ ying wing” tail type at an earlier stage,

receiver output “5” should still be free. If you have se-

lected the “normal” tail type, output “3” (ELE) should

still be free; this is the one we will use in the following

example.

Select the »MIX-only channel« menu (see above),

or the »Control adjust« menu (if the second ser-

vo is connected to one of the outputs 5 … 12), and

de-couple the “wrong” control function from the cont-

rol channel to which you have connected the second

rudder servo.

The differential travel is necessary in this case, since

the outside rudder turns through a larger radius than

the inside rudder when the model is ﬂ ying a turn; this

is broadly analogous to the effect of front wheel toe-

A il e r o n d i f f e r e n c e + 0 %

F la p d if f e r e n c e + 0 %

A il e r o n s 2 > 4 R u d d e r + 0 %

A il e r o n s 2 > 7 F la p s +

5 0 %

B r a k e > 3 E le v a t o r + 0 %

B r a k e > 6 F l a p s - 5 0 %

B r a k e > 5 A i le r o n s - 6 0 %

E le v a t o r 3 > 6 F la p

s + 0 % + 0 %

E le v a t o r 3 > 5 A il e r o n + 0 % + 0 %

F la p s 6 > 3 E le v a t o r + 0 % + 0 %

F la p s 6

> 5 A i le r o n s + 0 % + 0 %

R e d u c t io n o f d if f . + 0 %

S E L

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