|AHTS (Anchor Handling - Tug - Supply)|
|Electrics and Main Motors.|
|Initially I had intended
using plastic reduction gears for the main motors,
but on testing (installed in the hull) found them to be VERY noisy so removed the complete drive set up
and installed 2 new motors with direct drive,
each powered through its own Electronic Speed Control (ESC).
|To get a better turning
circle with the scale rudders, I have fitted an electronic mixer,
which is connected to both main motor ESC's and the rudder servo, when running straight,
both motors work normally, but as the rudders are angled the mixer alters the speed of each motor,
speeding up the outside (of the turn) motor and slowing the inside one.
This gives a very much better turning circle without the need to have
separate radio control of each ESC, (so saving one transmitter function).
|All motors are running
through ESC's, with the bow tunnel and bow swing down thruster
propeller motors using the same ESC, a micro switch on the swing down unit
diverts the power.
One transmitter function operates either unit.
|The servo used to lower and
raise the Swing Down Thruster, is controlled via
an electronic 'Servo Slow' unit, purchased as a kit.
|ESC Units (4): Mtroniks Viper Marine 15|
|Main Motors (2): Electronize 545 - 12|
|Electronic Motor Mixer (1): Barry's Model Control|
|Servo Slow Down (1): Ken Hewitt Electronics|
|Links to all the above are on my | Links Page ||
|Thruster Motors (3): Graupner Speed 400 (available from many model supply outlets).|
|Progress pictures, more will be added as the model advances|
|Click on thumbnail to enlarge picture|
|Aligning Main Motor|
|Motor with Coupling|
|Main Motor Speed Control|
|Main Fuse Board|
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|Material Copyright © 2007 Alan Rose|