The Locomotive Project
16mm on Gauge 1
Inspired by the new information
on the Elk Firebrick "Dinky"
locomotive the smaller scale project is a 1/19th scale version for 16mm
on Gauge 1 track. This will have the option of the enclosed cab and brakes as
per the "Dinky".
More information and drawings
will be added as I progress this project.
Byers locomotive builder's photograph (ex. libris
Susan Parker).
The Byers 0-4-0 locomotive prototype is an interesting little industrial
engine capable of useful work on both standard or narrow gauge track, and can
negotiate very tight radius curves due to the extremely short wheelbase. This
model would be able to negotiate the tightest radius curves and this will make
it very suitable for a small exhibition layout as well as a space restricted
garden railway/railroad.
In the prototype the motive power is provided by a pair of vertical "bottle" style
steam engines, more commonly used in stationary power plants, and a geared drive
to both front and rear axles. This model can use either conventional double
acting scale steam engines with Stephenson's valve control as in the picture or
the simpler oscillating type (either double acting (and thus self starting) or
single acting, in which case a discrete push will be required to get the loco
moving.
Note: for
1/19th scale there are some
clearance issues with the back-to-back of the rear wheels and the base of the
vertical section of the boiler which would need to be checked carefully if
1-3/4" OD tube was used ( 1-5/8" OD is fine ). As shown, my drawings
have provision for boiler lagging (dotted lines) so there is some leeway (a
1/19th scale drawing to be added soon).
Technical
Specification
Byers Geared Locomotive - Table of scales for 16mm
|
| Locomotive |
16mm Scale Dimensions |
Prototype Dimensions |
|
|
| Driving wheels, diam |
32.08 mm |
24 ins. |
| Journals, driving axles |
3.93 x 5.34 mm |
2 5-16 x 4 ins. |
| Axles, diam |
3.93 mm |
2 15-16 ins. |
| Main shaft, diam |
2.84 mm |
2 1/8 ins. |
| Countershaft, diam |
3.26 mm |
2 7-16 ins. |
| Wheelbase |
53.47 mm |
3 ft. 4 ins. |
| Length over all |
195.18 mm |
12 ft. 2 ins. |
| Width over all |
96.25 mm |
6 ft. |
|
| Cylinders |
7.35 x 9.36 mm |
5 1/2 x 7
ins. |
| Distance c. to c. |
65.51 mm |
4 ft. 1 in. |
| Piston rod, diam |
1.34 mm |
1 in. |
|
| Valve Gear |
|
Link Motion |
| Steam ports |
0.75 x 6.02 mm |
9-16 x 4 1/2 ins. |
| Exhaust ports |
1.34 x 6.02 mm |
1 x 4 1/2 ins. |
| Lap of valves |
0.42 mm |
5-16 in. |
| Lead of valves |
0.08 mm |
1-16 in. |
| Max. travel of valves |
2.67 mm |
2 ins. |
|
| Boiler; type |
|
Tee |
| Vertical leg |
42.78 x 80.21 mm |
32 x 60 ins. |
| Barrel |
32.08 x 85.56 mm |
26 x 64 ins. |
| Tube sheet and barrel plates |
Do NOT scale |
1/4 in. |
| Height from rail to centre line |
60.16 mm |
3 ft. 9 ins. |
| Length of smokebox |
26.74 mm |
1 ft. 8 ins. |
| Working steam pressure |
T.B.D. |
120 lbs. |
|
| Firebox |
|
Circular |
| Diameter inside |
37.43 mm |
28 ins. |
| Depth inside |
34.76 mm |
26 ins. |
| Side plates |
Do NOT scale |
5-16 in. |
| Crown sheet |
Do NOT scale |
3/8 in. |
| Grate area |
T.B.D. |
4 sq. ft. |
| Staybolts, diameter |
Do NOT scale |
3/4 in. |
| Water space, width |
2.67 mm |
2 ins. |
|
| Tubes; material |
|
Steel |
| Number |
N.A. |
32 |
| Diameter, outside |
N.A. |
2 ins. |
| Length between tube plates |
96.25 mm |
6 ft. 0 ins. |
|
| Heating surface - |
| Tubes |
T.B.D. |
88 sq. ft. |
| Firebox |
T.B.D. |
14 sq. ft. |
| Total, with exterior tube area |
T.B.D. |
102 sq. ft. |
|
| Exhaust nozzle, diam |
2.26 mm (will need adjusting) |
1 11-16 ins. |
|
| Smokestack, smallest diam |
10.62 mm |
8 ins. |
| Height |
53.47 mm |
3 ft. 4 ins. |
| Height from rail to top |
131.01 mm |
8 ft. 2 ins. |
|
| Tank capacity |
T.B.D. |
100 gallons |
| Coal capacity |
N.A. |
250 lbs |
| Brake Friction disk, |
|
operated by hand. |
|
| Gearing: |
| Driving pinion; diam., |
7.77 mm |
5 13-16 ins.; |
number of teeth 12 |
| Intermediate pinion; diam., |
16.04 mm |
12 ins.; |
number of teeth 25 |
| Axle gear wheel; diam., |
23.10 mm |
17 9-32 ins.; |
number of teeth 36 |
|
|
Note: This table is for exact 1/19th scale from the prototype.
Some dimensions will need to be tweaked.
The Project
CAD Drawings
I am working on a
set of CAD drawings for this locomotive. This is a background "as and when I am
able to find the time" project and I will add further information as I am able.
All my
drawings are 12" to the Foot scale i.e. full size, and are then scaled as
appropriate. These are based on the images from the Geared Steam site. I am
redoing the drawings with the higher resolution scans I now have.
Variations on a theme:
Dual gauge locos for Gauge 3 and Gauge 1 or Gauge 1 and O Gauge
The following drawings are "true-scale" and show the overall
size and basic dimensions for 2-1/2" (Gauge 3) and 1-3/4" (Gauge 1) at 1/20.5th
scale, or 1-3/4" (Gauge 1) and 1-1/4" (O Gauge) track at 1/32nd scale.
I have juggled the drawing slightly to rationalise the
dimensions. Some additional tuning is obvious, for example the wheel spacing in
the first drawing can readily be a whole inch instead of 31/32nd. I am
wary however of departing too far from true scale as part of the overall visual
effect is determined by the harmonic relationships between dimensions, not just
their gross overall sizes.
The boiler in both cases is shown with a monoflue for gas
firing, but coal firing should be possible with the larger of the two designs.
The boiler construction has been normalised for material size and thickness
determined by what copper tube is available for pressure vessels from model
engineering suppliers (in the UK). If in doubt always go for the thicker
material, if nothing else it will add to the adhesive weight.
Locomotive for Gauge 1 or Gauge 3 track - 1/20.5th scale
Locomotive for O gauge / Gauge 1 track - 1/32nd scale
3D Rendered Images - Boiler and Frames
Although the boiler is quite
small the steam collection space is at the top of the vertical tube section of
the boiler and the horizontal tube is always full in normal operation.
Flue is sized to use a radiant
burner. See the Southern Steam Trains article
Notes - Radiant Poker Burners for more information.
Additional References & Links
 |
The Association of 16mm Narrow
Gauge Modellers
"We run narrow gauge trains in the scale of
1:19 which represents 16mm: lft running on 32mm gauge track (O
Gauge) giving a prototype 2ft Narrow Gauge, or on 45mm gauge
track (Gauge 1) representing 2ft 6" and 3ft Narrow Gauge
prototypes." |
|
 |
The Berkley Loco Works 'Cricket'
This popular model was
based on the original information available for the
Byers Locomotive, primarily the advertisement woodcut engraving
shown above. |
|
|
Link images in this section are linked from
their respective websites - please let me know if they disappear. |
|
