Manual Graupner MC 32 HOTT (page 268 of 345) (English)

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268 Program description - Ring limiter

Ring limiter

Control of Voith Schneider propellers in model ships

Scroll with the selection keys on the left or right touch

pad to the menu option »Ring limiter« in the multi-

function menu:

MIX active/phase MIX-only channel

Dual mixer Fail-safe adjust

Teacher / pupil Tx. output swap

Profi trim Trim memory

Telemetry Channel sequence

Multichannel Ring limiter

MIX-only channel Dual mixer

Swashplate mixer Fail-safe adjust

Teacher / pupil Tx. output swap

Profi trim Trim memory

Telemetry Channel sequence

Multichannel Ring limiter

Tap brieﬂy on the centre SET key of the right touch

pad to open this menu option:

RING LIMIT

SET

Input

X Y

Output

OFF



This »Ring limiter« is primarily intended for the con-

trol of up to three so-called Voith Schneider propellers

in ship models. These are positioned beneath the

ship where they are exposed to a free ﬂow of water

in all directions. The control of these drives and turn-

ing their vertically oriented propeller blades is done

with two servos per Voith Schneider propulsion unit

whereby, for mechanical reasons, the propellers of

this type offered by Graupner under order nos. 2358

and 2358.BL have a maximum control travel limitation

of 4 mm each.

As long as the sticks for forward/reverse and left/

right are operated individually (see section "Column

Input") this is no problem because travel for the two

servos can be appropriately adjusted, both mechani-

cally as well as in the »Servo adjustment« menu.

However, this becomes problematic when, for ex-

ample, one stick is 100 % forward and, at the same

time, the other stick is pushed completely to the right

to arithmetically produce a 141 % sum for the two

servo travel vectors. The mechanical controls of the

Voith Schneider propellers will collide with their limits;

in best case only drawing an unnecessary amount

of electric current, in worst case causing damage or

even bursting the linkage..

In order to avoid this problem, the mc-32 HoTT

transmitter has a maximum of three "ring limiters"

available in the "SET" column of this option's ﬁrst

display page (see ﬁgure at left) that can be switched

"ON" or "OFF" individually. In the ﬁrst line on the set-

ting page for a given "ring limiter", its maximum travel

can then be set for a range of between 25 and 125 %.

The second line provides a setting for the size of

limitation of overall deﬂection between:

0 % circular limit ()

100 % no limit ()

(limitation is strictly a matter of the given stick's

mechanical stop)

Important notice:

When this function is used, leave the

respective setting values in the

»Dual Rate / Expo« and »Servo

adjustment» menus at 0 and 100 % or reset

them back to their default values.

The adjacent sketch illustrates the

effect for a 0 % setting. The cross-

hatched area of travel is curtailed

and appears as a "dead zone".

Column, "Input"

With the standard preset control mode 1, all three

ring limiters are pre-assigned to inputs 3 (forward/re-

verse) and 4 (left/right) which are actuated by the left

stick. However, this pre-assignment can be replaced

anytime by any other transmitter control combination.

Use the selection keys on the left or right touch pad to

move the marker frame to the desired value ﬁeld then

brieﬂy tap the centre SET key of the right touch pad:

RING LIMIT

SET

Input

X Y

Output

OFF



Select the desired control channel (1 … 12) for the

value ﬁeld now displayed in inverse video by using

the  or  selection keys. However, do not for-

get that if a control channel in the range of 5 … 12

is selected, it must also be assigned to a control in

the »Control adjust« menu, see page 118. Brieﬂy

tap the centre ESC of the left touch pad or the centre

SET key of the right touch pad to conclude your entry.

In principle, the other inputs are to be handled in the

same manner.

A tap on the  or  keys of the right touch pad

at the same time (CLEAR) will reset the active value

ﬁeld back to its given default value.

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Graupner MC 32 HOTT Manual

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