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MV Arne Christiansen
Forward
Note:
This is a future model. The current status is that I am
finished drawing the plans (see bottom of this page) by measuring photos as there are no plans
available. Construction is in the queue, which will be
after the PT boat.This model of the twin screw 3,800 HP (1,900 each engine) Southern Towing Corporation towboat Arne Christiansen, which will be built to 1/35 scale. The original's dimensions are: 120' long, 34' wide, and 10.6' deep (hull), and was built by Steiner Shipyards as hull number 504 in 2009. (The other azimuth drive boats are no. 501, 502, & 503.)
The model should be 42" long, 11.75" wide. Loaded weight should be about 20 pounds. Autosketch drawings were made by Lew using photographs. As the model azimuth drives (next paragraph) are not exactly to 1/35 scale for this particular towboat, the hull will be deepened slightly to compensate for the slightly deeper drive.
The unique thing about the Arne Christiansen
(and several other towboats built by Steiner) is that the
propellers are mounted as azimuth drives. Some people call
incorrectly them z-drives. The drives for this model will
be the Graupner 2335 Schottel drives (left). (Graupner stopped
all productiion in late 2012 so these will be more difficult to
get as time goes on.)
The azimuth drives operate as both the drive
(propeller) and steering (rudder) eliminating the need for the
aft and flanking rudders. Rather than divert the thrust by
using rudders (which at most can diver thrust to the side at
about 40-45 degrees), the entire drive (propeller mounted in a
kort nozzel) turns, so full power or thrust can be exerted
directly to one
side or the other and any angle with 360-degrees of movement.
The Graupner model drives have a 180-degree limitation on
rotating, but the propellers can be ran in reverse so in effect,
it would have the same performance as the real azimuth drives.Each drive can be ran independantly of the other, both in steering and throttle. One could be pointed 90-degrees to the side at half speed and the other straight back at full speed. The photo at the right is a boat builder's model showing the azimuth drive and short shaft to the diesel engine.
Status (January 2017): Drawings are done and plotted. Model costruction is expected to start in mid 2017. I have the critical two schottel drives and two Futaba HD servos, plus the electric motors.
More later as the model is constructed.