Roco Dv 12
Dv12 is the most common diesel
engine in Finland. In years 1963-1966 68 units Sv12-engines were
manufactured (from 1977 named Dv12), numbers 2501- 2568. In years
1974 - 1984 were manufactured other 64 engines, numbers 2601 -2664.
2600-series engines had different cooling system, causing also
visual changes to the front part of the engine. In parallel to
these engines were also built in 1965 - 1972 60 engines equipped
with additional steam generator and called Sr12 (from 1976 called
also Dv12, numbers 2701 - 2760), which were slightly heavier and
the exhaust pipes were bigger on both sides of the steering cabin.
All engines are still in use.
The boggies of Dv12 are designed
by Krupp in Germany , and the same boggies are also used in german
BR215, BR216 ja BR218 diesel engines. Almost every model train
manufacturer have one of these models in the product line.
Building starts with Roco's model
53463, Roco has made many different BR 215, BR 216 ja BR 218 -models.
The body plate is milled from brass
. The plate is modelled with 3D-Cad ( Pro/Engineer) and the drawing
is here as PDF-file.
Only the drive boggies and transmission
with motor is used from the original loco.The drive shafts have
to be shortened.
The motor has fixing screw holes
on the sides.
Parts have been manufactured with
a rapid prototype mashine.
To avoid light glowing in the white
material, the light holes are painted black.
The parts are glued together with
zap-glue and painted with Humbrol red 19 and cream 41.
The lamps are 1,5V/15mA diameter
1,2mm from Miniatronics. Because of the low rated voltage a resistor
is needed to limit the current. There are four lights each end.
Here the lights are connected in
series in both ends, which is the best way, as the power loss
in the resistor remains low and only a 0.5W resistor is needed.
Also the wireing is rather simpel.
The decoder is installed in the
steering cabin.
Handrails are done with 0.5mm brass
wire and the bridge is painted with medium grey Revell 77.
Silta ja kaiteet maalataan keskiharmaalla,
esim. Revellin no. 77. Kaiteet juotetaan 0,5mm messinkilangasta.