Gauteng Model Boat
Club - Latest News
Summary of Work done for Howard
16 August 2018
Howard is a long-time member and
supporter of the Gauteng Model Boat
Club. Alas, like many of us, he has boats gathering dust in the garage and
needed help in making them seaworthy again. I gladly agreed to help and I am
going to explain briefly what I did and why.
Graupner Wiesel Torpedo
was built decades ago by his son and has not seen action for decades too. This
boat needed a new speed controller, and as it has two motors, the HobbyWing
Quickrun 860 was ideal. The major problem was that both motors were using
left-handed screw propellors, which meant that the torque of the motors turning
in the same direction made the boat lean badly. Solution was to buy from
overseas a set of left-and right-handed propellors.
RC was upated using the Hitec 27 MHz cheaply sold at Aerial Concepts. A bracket
to hold two sets of 7.2 V 4600mAh NiCd was made. Also, the couplings were
improved to run smoother and quieter.
boat kit was bought by me from Aerial Concepts. I then got as far as adding the
running gear and starting on the deck. I lost interest a bit and Bruce Tandy was
keen to work on a torpedo boat that just needed the scale part done (the part I
lose interest in).
it needed was the new RC installed and a new 2S Lipo battery to run for longer.
I also added weights to the front so that the steering and stability was
Graupner Weser Fire Boat
is a very old and classic kit. This boat required the most repair. Firstly, I
removed all the old Mabuchi motors and their mounts and replaced them with three
550SH fan-cooled motors bought from RC Edge. I replaced the middle shaft as it
was rusted in and repaired the Kardan couplings. Again, the boat required two
left-hand and one right-hand propellors, three new motor mounts, and a water
pump for the three water monitors.
these were bought from Cornwall Model Boats. A speed controller, HobbyWing
Quickrun 860, was bought and a 6V 12 Ah lead acid battery. A peculiarity about
this boat is that only the outer drive trains have rudders, and the middle
rudder is not there. This means that the middle motor does not add to the
steering and so I decided to put the middle motor on a microswitch to only turn
on when the boat is going at speed.
means that the boat can run quite slowly and steer well. As the speed controller
is a dual one, I used one of the motor connections to run the outer motors and
the second motor connections to run via a microswitch mounted on a servo
connecting to the middle motor (which I also gave a larger propeller than the
second micro switch on a servo was used to turn on the Graupner water pump,
being supplied by a 6V NiCd set. To run all this via the 6 channel radio, I also
built a new servo tray. All batteries have an inline fuse. The most challenging
bit was on the superstructure. The superstructure is removable, but also
contains two fire monitors.
means I needed to redo the plumbing so that the water pump also supplied them
yet did not make the superstructure unwieldly to remove. The best was to use
silicon tubing and T-pieces from Midas for the window washers. A nice feature of
the original build was to rotate one of the fire monitors and a search light. I
had to rebuild that and also fix all the numerous leaks. I added about 3kg of
lead weights to get it down to the water line.
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