Manual Graupner MC18 (page 37 of 56) (English)

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The latter set-up is also called “butterfly” or “crow”

function. In some cases separate ailerons and plain

flaps are replaced by one-piece full-span flaps, which

are simultaneously operated as ailerons and plain

flaps (called flaperons). Performance flying means

flying at very low drag, in any flight situation and

attitude, including turns and circling flight.

Lowest drag is achieved only when the airflow hits the

model head-on, that is when side-slipping (with the

flow having a component along the lateral axis) is

avoided. This condition is simplified by differential

ailerons used in conjunction with the aileron – rudder

mix, whereby the negative yawing moment is

compensated for. Additional mixers increase the

effect of the control surfaces (plain flaps – ailerons),

ensure uniform lift distribution (ailerons – plain flaps),

increase manoeuvrability (plain flaps – elevator) and

adjust elevator trim for deflection of the flaps.

In addition to the normal actuation of the plain flaps,

via slider-type potentiometer or a step switch, the F3B

programs offer storable pre-sets for plain flaps and

elevator adjustments for any flight task and for take-

off, all of which can be called via a switch. Which of

the operating elements is to be used for in-flight fine

tuning of the flaps settings can be determined

separately for any of the presets.

The change of the flap and elevator settings when

switching from one preset to another one is not made

abruptly, but achieved using separately adjustable

time constants. Other sensible options, such as

reduction of aileron differential (for butterfly function),

co-switchable PROFITRIM-module with optional

storing of adjustment data, etc., simplify handling of a

model for the demanding contest flyer and assist him

in his endeavour to achieve optimum performance.

The two F3B programs differ only in that model type 6

is meant for flaps which are operated by a common

servo, while each aileron is operated by a separate

servo (in all 3 wing-mounted servos), while type 7

refers to a set-up where each flap and aileron is

operated by its own servo (4 wing-mounted servos).

In the case of type 6, the flaps can be moved only in

unison, so the aileron flap mixer is omitted. All

other options are alike for type 6 and type 7, so the

two programs may be described together.

Model types 6 and 7 provide nearly all of the options

of types 1…5, with the sole difference that those

functions which are needed for power models only

are omitted, such as throttle reduction (code 17) and

automatic manoeuvre (code 66). As opposed to types

1…5, seven freely programmable mixers are

available for type 6 and 7. Code 23 (switch allocation)

takes the expansion of the F3B program into account

when compared to normal types.

In addition types 6 and 7 provide the following

functions (listed in sequential order of their

descriptions:

Code Display Meaning Page

23 SWITCH FUNCT. External Switch Allocation 38

52 STRT-SPD-DIST Flight Trim: Start, Speed, Distance 39

53 FLAP TRIM ASS Flap Trim Assignment 39

92 SMOOTH SWITCH Servo Transit Time Set -up 39

41 AILE RUDD Aileron to Rudder Mix 40

42 AILE FLAP Aileron to Flap Mix 40

49 FLAP AILERON Flap to Aileron Mix 40

91 AN. TRIM SW Set-up for PROFITRIM 42

48 FLAP ELEV Flap to Elevator Mix 42

47 ELEV FLAP Elevator to Flap Mix 42

44 BRK ELEV Spoiler to Elevator Mix 43

45 BRK FLAP Spoiler to Flap Mix 43

46 BRK AILERON Spoiler to Aileron Mix 43

54 DIFF REDUCT Reduction of Aileron Differential 43

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Graupner MC18 User Manual - German - 188 pages

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Graupner MC18 Manual

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