Garden Railway Forum

Looks fantastic Dave. Wish I could smell it also. Are you going to film it having a run please....

FWLR wrote: ↑Tue Nov 10, 2020 6:58 am Looks fantastic Dave. Wish I could smell it also. Are you going to film it having a run please....

It smells good Rod. A film will be done

Here we are lads! Had a great run on the line yesterday. The second run around the whole loop. BBQ briquettes are up to the job. I got two laps eventually on one firing before putting the loco to bed - to run the fire right down. Interesting video, an over full boiler with water coming out of the safety and funnel after one lap. And some slow shunting showing where I had previously had a derailment

Lovely run Dave. Beautiful engineering. Thanks for sharing.

Love it Dave. You have done a really brilliant bit of engineering. To have a loco that powerful and completely scratch built is a truly fantastic achievement. WELL DONE..

Thank you Rod!

This fuel is lovely and clean burning, no need for tube sweeping, just a puff of air will do

Superb Dave, now that's what I call clean..

Better than having to get the cleaning gear out and spending far more precious time not being able to be doing other far more enjoyable things.

I'm really looking forward to another run Rod, but the weather is against me

If it's not raining it's blowing a gale. In the meantime have I made another cover for the real steam dome. The old one leaked at the thread when using my gentle thread sealant or PTFE tape, it was visible at steam raising, heaven knows how much it leaked when the boiler was up to pressure. This cover needs to be removable to be able to remove the regulator. I had previously used a medium strength thread sealant but on this diameter (21mm) it was very hard to remove the cover when needed. The other day I made another screwed cover with a flange, hopefully this will fix it

Hi All
I am new to 16mm railways and new to Garden Railway Forum so forgive me if I a going over old ground. I am building Wild Rose using drawings from 16mm association but have recently become aware of a version with oscillating cylinders. I wonder if it is possible to obtain drawings of this revision as it seems to run well and will be somewhat simpler to build than the slip eccentric valve gear as on the original design.
Thanks BOBL

Hi
I did a bit of digging on t'internet and discovered this ....

The original 'Wild Rose' was built around 1986 and described in the Association of 16mm scale Narrow Gauge Modellers Journal, SMT issue 40. I started from an outline drawing of a quarry Hunslet by John Foulds in SMT 17. John also wrote another article in SMT 36 about how he built quarry Hunslets driven by an oscillating cylinder with geared drive.

I have a few old back issues of SMT but I'm not at home at the moment so no idea if I have SMT 36 among them. I'll take a look when I get back and let you know.

Rik
PS Just remembered as a member of the 16mm Assoc I can download back issues of SMT from their website. I've just looked through issue 36 but can't find any mention of Wild Rose. I'll do a bit more searching and let you know

Hi
Yes, it was in issue 36. But tucked away - just a one page entry about building Quarry Hunslets. Not much detail, I'm afraid ...

John Foulds

I have now built, with the help of my son Andrew, ten
"Small Hunslets" with more under construction. They are
all pot boilered with the saddle tank acting as ducting. The
boilers are now copper, si lver soldered and after many
experiments the pressure is now 40lb/sq .in. The main
variation in the models has been the drive train.
The first model was Mamod band drive. This was
replaced with gearing and never repeated. The second
model was a Mamod single acting oscillator, driving a 6: 1
worm with a flywheel ; this was very satisfactory. It did
however need a flick start to get the engine over T.D.C .
The next design to overcome this was a home-made single
acting oscillator and a 4:1 spur gear train. The 4:1 to give 4
beats per rev. This loco also proved very good and on one
trial just managed 1 mile on my end to end track. The gears
on this however were sintered and designed for electric
aircraft and failed after quite a few miles. The loco is now
direct drive double acting cylinder between the frames.
About the time "Cross Foxes" appeared and I decided to
build a loco that would run without much attention at scale
speed. Once again the small oscillator ¼" bore x 5/26"
stroke, double acting in the smoke box. A very simple
starter, and 12:1 worm gear drive . This loco will crawl or
flat out will only do a scale 20 mph . The boiler will allow a
good 30 min. running and the loco has been run at many
exhibitions .
The next design of drive was direct acting oscillator
between the frames. At first 3/s " bore x ½" stroke was tried
but this needed 60lb/sq.in. pressure and a high load on the
valve plate to maintain pressure. By building next a 7/ 16"
bore cylinder, then V2" bore cylinder, the ½" bore was
chosen as standard. The boiler pressure was dropped to
40lb/sq.in ., still rather high but it allows one to blast up
short hills in a cloud of hissing steam.
Lubrication on all locos to date is by displacement
lubricator. The cylinders are brass and the pistons steel and
aluminium. On all the latest models I only drill ½6" dia .
ports or smaller to reduce gas flow and the throttling also
reduces condensation problems. Only a small amount of
steam drying is done . Too much super-heat gives
lubrication problems and reduces exhaust steam effect.

Sorry, no draings or photos. All the other articles are about Wild Rose in its later form

Rik

Thanks for that John.

Seems that you are something of an expert having built 10. I am still on my first but with no knowledge of oscillating engines I think I will stick with the original slip eccentric design at this stage.

I wonder if oscillating engine design is covered in more detail in any of the back issues the magazine.

Thanks again for your help

Bob Lilley

John Foulds hunslets were a bit of a legend apparently. I remember at the Ffestiniog's Hunslet 125 event in 2018 someone (I think one of John Fould's relatives) brought a box load to display on the 16mm layout we were running on. Gareth even steamed one up - 'Tizzy' was a model of Louisa (an early small quarry hunslet) - it ran superbly....

I've managed to find a few pictures - not sure of the drive train in these examples - they look direct drive but maybe they had oscillating cyclinders between the frames?
Four Foulds Hunslets (the front one is a Finescale I think).

Winifred is a Finescale Hunslet I think, Lady Madcap is the Foulds hunslet.

Tizzy at speed: