VSP® Voith Schneider Propeller
Instructions for VSP
Order No. 2358
The Voith Schneider drive unit is a scale model of a full-size propulsion system using
a blade propeller; the unit provides both power and control of direction in the model
boat. In a sense it represents a perfect variable-pitch propeller, because its thrust can
be varied both in magnitude and direction. The amount and direction of thrust are
controlled solely by varying the cyclic pitch of the blades, and this makes it possible
to adjust the boat’s position quickly and accurately to suit changing conditions and
tasks. The integral electric motor is only required to run at constant speed and
direction, regardless of the manoeuvre; no speed controller or method of reversing
motor direction are required. The operating voltage must not exceed 12 V.
The Voith Schneider propeller is designed as a robust slow-running unit using a high
reduction ratio on the electric motor; this ensures reliability and long life even when
the system is subjected to considerable external forces in strenuous tug manoeuvres.
The rotational speed of the propeller wheel should be around 765 rpm, which
equates to a motor speed of N
nom
: 8040 rpm.
VSP Order No. 2358
At 12 V this rotational speed corresponds to a speed controller setting of around 60%
(Graupner RC system).
The Voith Schneider drive unit (single-propeller and twin-propeller systems) is
installed in the underside of the boat, with a free flow of water to and from it in all
directions.
The model Voith Schneider drive system is primarily made of glass fibre reinforced
plastic, and features special bearings made of water-lubricated plastic. Highly
stressed parts such as the control lever, the guide sleeve and the motor pinion are
made of metal. The propeller blades can easily be removed and replaced if
damaged.
The drive unit is controlled by two servos acting upon the central control lever, which
in turn swivels the five vertical propeller blades in order to change their pitch. It is
essential to install servos with accurate centring characteristics, i.e. digital servos, as
any slop or lack of precision in the servos makes precise control of the model
impossible.
The travel of the two servos must be restricted to 4 mm from the centre to both sides.
These exact travels can only be set using a programmable MC system.
It is essential to avoid the control lever fouling the inside of the guide sleeve. Any
contact will generate a rattling sound from the mechanism, and this indicates an
overload condition. If left uncorrected, this will result in damage to the mechanism
and leaks in the system.
Important:
check every time you switch the RC system on that the trim levers are at
the neutral position.
Repairing the VSP
Disconnect the motor from the power supply leads. Disconnect the servo linkages
from the control lever.
Unscrew the M3 x 3 grubscrew between the guide sleeve and the toothed belt pulley.
GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
No liability for printing errors. Technical modifications reserved.
10/2010
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