Compatibility Slo-mo: low speeds just like the real thing
Slo-mo adds inertia and momentum to small live steam locomotives for
more realistic running. Watch the video to see what is possble with
More information and videos on the Slo-mo from SSP: http://smallsteamperformance.com.au
Fitting is a relatively straight forward job following the
instructions on the SSP internet site for a Roundhouse Katie and Billy. It's not
really necessary to remove the body. However as there are steam pipes
underneath a Riverdale boiler two extra steps are needed before fitting
First the steam pipe coming down from the boiler and going to the
steam-tie of the cylinders has to be bent about 2mm away from the
Slo-mo to create ample room for adjustment of the chain later when
fitting the Slo-mo (see drawing). To have enough room doing this, set
the front wheels maximum outwards, loosen the steam pipe nut from the
steam tie and remove the central frame spacer (which needs to be
removed for the Slo-mo anyway). Bending steam pipe needs to be done
before fitting the Slo-mo and with care preventing too tight curves.
Best is to bend the pipe with your fingers as your fingers are nicely
soft and round. Start with bending back bend 1, next make bend 2 and
finally adapt radius of bend 3 for which I fitted temporarily a Regner
M5 nipple to have some length to apply force with my fingers. The steam
pipe of the Billy/Elke is more easily bent in place since the boiler
sits higher. So loosening the steam pipe nut and applying the Regner M5
nipple is not absolutely necessary.
The trick with re-adjusting the Roundhouse weigh shaft as described on
the SSP internet pages for a Katie will just not work for a coal-fired
Irene. As a second step it's wise to exchange the weigh shaft with a
new one. A new weigh shaft is easily made by yourself by bending a
piece of 1/8 inch stainless steel rod in your vice (see drawing below,
dimensions in mm). Make sure that both rod ends are nicely aligned and
the weigh shaft is minimal 4.8mm deep. I used a 3mm rod as I had
nothing else available. Works fine but play is a bit much.
As the Billy/Elke has a straight weigh shaft all this is not necessary
when fitting a Slo-mo on a Riverdale
For Elke you have to find a solution for
the whistle because
the Slo-mo took its place.
A good solution is to fit the whistle inside the right side tank and
between displacement lubricator & boiler. See drawing below: 1 =
whistle valve; 2 = whistle pipe; 3 = whistle; 4 = M5 union nut. For a 1:1 PDF
drawing that can be used as guidance to bend the new whistle pipe open
and download this link
Print the drawing at 100%. Shown are front, side and top view of the
new whistle pipe. Eventually you need a new clamp nipple for the Regner
whistle kit as you have to alter the steam pipe.
best results you need to exchange the exhaust nozzle. A set of new smaller
exhaust nozzles is available optimized for running at realistic
speeds to get the most out of the Slo-mo. Under damper control you
can run extremely slow without losing the draft (see video).
Because water usage is lower, running time will be upto 25 minutes compared to 20 minutes without Slomo. Running 25 minutes the boiler has to be kept on temperature longer resulting in a higher coal usage. So make sure you have enough coal in the firebox!
The new smaller nozzles, the Regner M5 nipple and a new Regner clamp nipple are available now.
However not tested yet, the Slomo for the Darjeeling "B" and Lady Anne should fit the
coal-fired Darjeeling "B" and Amy respectively.