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head screws 7 and washers 8. Ensure that the motor is moun-
ted on the correct side of the bulkhead. File an area on the top
of the motor case perfectly clean, so that the suppressor capa-
citor can be soldered easily. Attach the suppressor capacitors
to the motor.
The power wires 36 should be soldered to the motor terminals
at this early stage.
Solder the grease tube 10 to the stern tube 9 as shown on the
plan. Drill a 3 mm Ø hole into the stern tube through the grease
tube once the joint has cooled down. Remove all drilling swarf.
Fit the locknut 12 and the propeller 13 on the shaft 11.
Fit the prepared stern tube through the hole in the hull from the
inside, then slip the propeller shaft into the tube from the rear.
Fit the tube support 14 under the stern tube, and check that it
rests on the support over its full length without being under ten-
sion. You may need to adjust the hole in the hull slightly.
The motor can now be installed. Place the spacer sleeve "D" on
the propeller shaft and over the threaded motor shaft. Measure
the distance between the stern and the bulkhead, then glue the
bulkhead and stern tube in the hull, using plenty of Stabilit to
form a fillet round the joints.
The stern tube can now be glued in place: withdraw the pro-
peller shaft 11 slightly, and loosen the motor a little so that the
spacer sleeve can be removed. Fit the collet 15 on the shaft.
Connect the motor to the propeller shaft using the articulated
double-cruciform coupling 16, and tighten the retaining screws.
The coupling consists of parts 1 DK - 4 DK.
Fit the two O-rings 18 and the brass bush 19 on the shaft of the
Kort nozzle 17; note that the rings must fit in the annular chan-
nels. Slide the Kort nozzle and bush into the hole in the hull from
the underside, holding it at a slight angle to the rear.
Fit the lower bearing 20 on the bottom spigot of the Kort nozz-
le and align the system so that its underside is in line with the
keel. Check that the propeller is in the centre of the Kort nozz-
le when viewed from the rear. Glue the lower bearing 20 in this
position, and secure it carefully while the glue is hardening,
packing up the Kort nozzle to keep it in place.
Now invert the hull and apply a generous fillet of Stabilit round
the brass bush 19 where it meets the hull. Check that the Kort
nozzle still swivels smoothly.
Push the collet 22 into the steering lever 21 and fit the socket-
head screw 23. Fit the completed steering lever on the rudder
shaft and tighten the screw.
If you intend to install a battery other than the lead-acid or
seven-cell Nickel pack recommended, you may need to adjust
the opening in the mounting plate 24. These instructions des-
cribe the installation of the lead-acid battery shown on the plan.
RC installation
Note: if a modern speed controller is used, the suppressor filter
shown on the plan and in the exploded drawing is not required,
and can be omitted. The receiver battery cradle 37, the receiver
battery 38 and the switch 41 are also no longer required.
If you wish, you can glue a hardwood stiffening strip (not inclu-
ded) to the underside of the mounting plate 24. Glue the plate
24 in the hull, and weight it down until the glue has set hard.
Assembly and operating instructions
Neptun
Hold the servo mount 26 on the servo mounting plate 25, drill
suitable pilot-holes, and fix it in place using the screws 27 and
nuts 28.
Note the angle of the servo mount as shown in the plan view,
and take care to maintain it accurately.
The prepared servo mount assembly can now be glued in the
hull in the position shown in the plan view. Fix the servo 29 in
the mount when the glue has set hard.
The steering pushrod is made up from parts 30 - 32.
Cut the steel steering pushrod 31 to approximate length, and
solder a clevis 30 to one end. Screw the second clevis onto the
threaded coupler 32. Connect the soldered clevis to a hole in
the steering lever as shown, and connect the clevis and threa-
ded coupler to the servo output arm, after cutting it down as
shown on the plan. Cut the pushrod to exact length, then sol-
der the cut end in the socket of the threaded coupler.
Final adjustment of the pushrod is carried out at a later stage,
as part of the check of the working systems.
Place the drive battery 33 and the speed controller 34 in the
hull.
During the wiring procedure please keep to the instructions pro-
vided with the speed controller. The red and black wires atta-
ched to one end of the speed controller are those which should
be connected to the drive battery. Attach an AMP-Faston plug
35 to each wire, and push them into the corresponding con-
nectors on the drive battery. The use of connectors allows you
to remove the battery at any time for charging.
The receiver 39 can be secured on the mounting plate using
double-sided adhesive tape. Cut the plastic sleeve 40 to length
and tack it to the inside of the hull just below the flange at the
points marked "x" on the plan; use drops of cyano for this.
Thread the receiver aerial into the sleeve.
The RC system can now be connected. At this point it is possi-
ble to make final adjustments to the steering system, and test
all the working functions. Give the drive battery a full charge
before you do this.
Adjusting the steering system, testing the working systems
Switch on the transmitter and connect the speed controller to
the battery. The rudder stick and trim lever should now be at
centre. The rudder servo will now also be at "neutral" (centre).
Screw the clevis in or out on the threaded coupler until the stee-
ring pushrod is at right-angles to the line of holes in the steering
lever. The Kort nozzle should now be at "neutral" (straight
ahead). If not, loosen the socket-head screw 23 and adjust the
Kort nozzle.
With these adjustments completed, check the movement of the
Kort nozzle including trim travel: the Kort nozzle must be able
to deflect through the same angle on both sides of centre,
without the nozzle or the steering pushrod binding or fouling at
any point.
The throttle function should be assigned to a non-neutralising
stick on the transmitter. Check the system as follows: move the
stick forward (away from you), and the propeller should rotate
to the left (anti-clockwise) when viewed from the rear.
If it spins in the reverse direction, swap over the connections
between the motor and the speed controller.
14
No.
1030
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