Category: Horse Thief & Never Mine

Building the Big Thunder Dynamite Shack

 

Howdy folks! In today's blog and video, I'll walk you through the planning and building for my version of Big Thunder Mountain's Dynamite Shack - AKA: the "goat trick" scene! It's a fun scene I've always wanted on the On30 Thunder Mesa layout and I'm happy to share the details here.

That pesky dynamite chewing goat on Big Thunder. Locals call this scene the "Goat Trick," because if you keep your eyes on the goat while your train rounds the sharp curve, you can get a dizzy feeling like you're spinning super fast. The effect works best in the last train car.

I drew these plans based on photos and observations of the structure in both Anaheim and Orlando. The one on the ride is actually quite tiny, so I scaled mine up to O scale person size. Note the built-in sag in the roof.

A planning model for the dynamite shack. This was used to make sure everything looked right at scale and would fit in the scene. It was also used to plan the laser-cut parts that would be used to build the finished model. The side lean-to shed was later omitted for the final version.

Here are the basswood laser-cut parts being assembled. Everything was stained with an alcohol and black shoe dye mixture before assembly and the signs were created with acrylic paint and custom stencils.

Here's a nifty trick. The look of antique rippled glass was created by painting Woodland Scenics Realistic Water onto the acrylic glazing, then drying it quickly with a hair dryer.

The roof was made from 1/16" thick illustration board, trimmed with stained basswood. The shingles are laser-cut paper - a future product from Crescent Creek Models.

The entire scene was built and detailed on a removable piece of Extruded Polystyrene Foam scenery that serves as one of the access hatches for Rainbow Caverns. 3mm yellow LEDs were added inside and out, and the front porch lantern has a built in flicker.

Detailing the scene was the most fun. The goat is from a set of O scale farm animals that I picked up, and the dynamite sticks are short pieces of red wire insulation. Tools and barrels come from various manufacturers, and the Lytum & Hyde dynamite boxes were designed by me and printed out on heavy paper. These are available as a free paper model download here.

More details are visible in this overhead view, including the hidden Mickey made from gears and junk from my scrapbox. The desert plants are from Woodland Scenics, Scenic Express, Pegasus Hobbies and others.

The finished scene. Future plans are to add the Big Thunder goat sound effects with and ITT Products sound module. These can be activated by a passing train, or by pushing a button on the layout fascia.

Big Thunder Camp

The dynamite shack sits on the outskirts of Big Thunder Camp, along the right of way for the On18 Horse Thief & Nevermine mining tram. It makes a nice addition to this scene, where its placement makes logical sense among all of the mining activity at Big Thunder. I'll have more on the mines there in a future update.

That's it from Thunder Mesa. Until next time, adios for now!


Thanks for following along, amigos. Registered users can leave questions and comments below so, please, join in the conversation!

All the best,
Dave

Building a Miner’s Shack

Be it ever so humble

This little miner's shack was built for Big Thunder Camp and sits along the right-of-way for the On18 Horse Thief & Never Mine Ry. Made from wood, foamcore, and a few Grandt Line castings, it was a fun and relatively simple project to build. The footprint is about 16x12 scale feet (4x3"). The shack was basically designed as an elaborate lamp for flickering LED lanterns, and I'll show just how to build and install those in the photos and captions below.

A black foamcore box forms the basic shell of the structure that will be clad in wood siding. The ridge line dips on purpose for a built in sag in the roof. The doors and windows are modified Grandt Line castings. The wooden siding is coffee stir sticks from my local craft store, and I purposefully made them a little uneven. Each board was stained with a 10:1 alcohol and shoe-dye mixture and custom fit to its place the structure.

The Grandt Line doors and windows were primed and then drybrushed with craft acrylics to match the distressed look of the wood siding. The clear glazing has been "fogged" with Avery inkjet labels - a nifty trick I picked up. With the walls finished, I tested the fit in its intended location before starting on the roof. Roofing on the shed portion is black gaffer's tape, which does a good job of simulating tarred canvas in this scale. I also installed a cardstock ceiling to prevent light leaks around the roof.

The built-in roof sag was accomplished by carefully scoring and then folding the cardstock roof panels to match the ridge line. Excess material at the top was then trimmed away to match the sag. I drew lines on the roof 3/8" apart and applied the Bar Mills paper shingles with yellow glue. The smoke-jack is another Grandt Line casting.

With the structure complete, it was time to move on to the lighting. The basic materials for a flickering lantern are shown above. I purchase the 3mm yellow flickering LEDs in bulk on eBay. I like the yellow color for kerosene lamps, and flickering amber LEDs for simulating fire. On these newer LEDs the flicker is already built in and no special circuitry is required. The liquid latex is sold as Liquid Electrical Tape at the local hardware store. I used it to insulate the diodes and copper wires inside the barrel where the space is too small for tape or heat shrink tubing.

These photos show the complete lantern assembly for the front porch. A 1/8" hole was drilled through both barrel and the porch. The barrel is a resin casting from Rusty Rails. It was painted with acrylics and glued in place on the porch. The lantern pieces were painted red and assembled atop the barrel as shown. Because of the tight space, bare copper wire was soldered to the diode leads and then threaded through the barrel and porch. Thus the need for the liquid latex. A 510 Ohm 1/4 Watt LED resistor was soldered to the positive lead and then 20 AWG wires were soldered to bring power. After soldering, everything was protected with heat shrink tubing.

In the finished lighting set up, the wiring runs down through gaps cut in the foam base. One flickering and one non-flickering LED light the interior of the cabin. An interior black foam-core box was created to house the lighting and prevent light leaks, and the shack slides down on top of this black box. The last two photos and the video below show how the lamps look when illuminated. A 9v DC transformer provides power for these and other lights on the layout.

 

Flickering Lanterns in the Miner's Shack


Thanks for following along, amigos. Registered users can leave questions and comments below so, please, join in the conversation!

All the best,
Dave

Calico Canyon Unit of the Horse Thief & Never Mine Ry.

A Simple On18 Loop

This may be a case of the name of a model railroad being longer than the line itself, but I had to call it something, right? The Calico Canyon Unit of the HT&NMRy is a simple loop of 9mm gauge track about a foot below the Thunder Mesa mainline in Calico Canyon. It emerges from a mine tunnel, crosses Calico Creek on a high trestle, then passes behind a waterfall before ducking back into another tunnel. Round and round it goes, bringing a little more kinetic energy to the canyon scene. The circle is 11" radius and uses Peco HOn3o track for the visible areas, and Atlas N scale snap track for the hidden parts of the loop. Power comes from a well used Kato DC power pack under the layout.

The idea began with earlier plans for Calico Mountain and evolved into a loop inside the canyon when I started roughing in the scenery there. I started by creating a circular sub-roadbed from pink extruded polystyrene foam, and then building the canyon walls up with more foam around it. Midwest HO cork roadbed was glued to the foam with yellow carpenter's glue and allowed to dry overnight before track laying began. Using sectional track in the hidden areas allowed me to leave some rail joints un-soldiered, always a good idea since nickle-silver rail shrinks and expands with changes in temperature.

Calico Creek will cascade down the canyon in a series of dramatic falls, over and under the On18 and On30 tracks. Up top on the TMMC mainline, a new mine headframe and hoist house will be built near the backdrop, giving the illusion that the On18 tracks below are part of a large mine complex.

Progress on this little loop is tied in with progress on the larger scenes of Calico Canyon and Calico Mountain. The next big jobs will be building a mine complex trackside and all of those bridges across the canyon. Then there's the canyon scenery itself to finish and the cascades and falls of Calico Creek. In the meantime, here's a quick video of the On18 loop in action. Stay tuned, Amigos!


 

Adventures in On18

The Horse Thief & Never Mine Ry.

Plans for an On18 mining tram to feed the Thunder Mesa mainline have gone through several evolutions over the years. Most recently, I've settled on a simple point to point design that operates between Never Mine tunnel through Baxter's Butte, and some as-yet-to-be-built ore bins at Horse Thief Canyon. In between, the tram will serve the richest diggings in the territory; Big Thunder Mine and the camp of shacks and outbuildings that have sprung up around it. Earlier versions had the tram extending all the way to Calico, and even included a portable On18 module at Calico Mountain. This plan was scrapped, mostly due to esthetic reasons since I decided a long On18 trestle in front of the backdrop would detract from other scenic features there like Horse Thief Canyon and the balancing rocks beyond.

An On18 Primer

Simply stated, On18 is O scale trains running on N gauge track. The "N" in N gauge stands for 9mm, and that scales out to about 18" in 1/4" O scale. 18" was a common track gauge for mining trams in the American West so the result of this scale/gauge alchemy is On18. I'm sure that readers of this blog don't need reminding about the esoteric differences between scale and gauge, but just in case you do, there's a post on it here.

To make things just a little more complicated, On18 trackage on the Thunder Mesa layout is represented using Peco HOn30 flextrack and turnouts which are, of course, also 9mm gauge. HOn30 uses N gauge track and mechanisms to model 2' gauge or 30" prototypes in 1:87 scale - but that's a story for another day. Suffice to say that this Peco track also has the perfect look for a light On18 mining tram.

On18 uses parts and materials from N, HO, S, and O scales to represent 18" gauge equipment in 1:48. Vertical boiler engine #2, the Walter Knott uses a 3D printed shell from Shapeways atop an N scale Kato 11-103 mechanism. 


Earlier Track Plans

As mentioned above, fitting an On18 line into the world of Thunder Mesa has been an ongoing process. Several plans were created and then later set aside as the line as it currently exists evolved somewhat organically on its own. Here are a few of those On18 plans, all of which incorporate Calico in some form or another. Though none of these are presently being built, each could work on their own in some future project.

Building the Horse Thief & Never Mine

The point to point On18 HT&NM Ry runs on a level between 5 and 6 inches above the On30 tracks of the TMMC. It starts at some ore bins at Horse Thief Canyon before quickly ducking into a tunnel and emerging at Natural Arch Bridge where it crosses the TMMC mainline. From there it's on to Big Thunder Camp, which sits directly above Rainbow Caverns, and into Never Mine Tunnel which passes through the heart of Baxter's Butte. The line terminates at the combination dump trestle and loading dock above Saguaro Siding. The sharpest curve on the line is about a 12" radius and control is standard DC. In the future, point to point operations may be automated using photic detection and a Circuitron AR-2 unit.

Track and roadbed being laid through Big Thunder Camp and across Natural Arch Bridge. Midwest products HO scale cork roadbed and Peco HOn30 track were the products used.

Track was primed and painted with artists acrylics. The trestle above Saguaro Siding was originally built for On30 rails, but it works just fine for On18. The scratchbuilt jib crane is used to bring supplies up to the mines from the TMMC siding below.

Ground cover is Polyblend sanded grout, and the ballast is red dirt collected near Sedona, AZ. Plants, weeds and bushes come from Scenic Express and Woodland Scenics. Cacti are from Pegasus Scale Models. 

The miner's shack was scratchbuilt from wood and Illustration board and features flickering lantern lights.

At least two more locomotives will join the HT&NM Ry roster, a tiny Shay, and a Porter-like 0-6-0, both currently under construction. The 0-6-0 is mostly being built from scrapbox parts, but the Shay has a 3D printed shell  from Marsh Creek Miniatures and runs on a Kato 11-103 chassis.

What's Next

Most of the track for the On18 line has now been completed and the rest is details and structures. One of the main features will be the Big Thunder Mine complex. This will be a combination of kit-bashed and scratchbuilt structures sitting on a high ledge above Rainbow Caverns. A below ground view into the caverns will also reveal the main shaft of the mine and an animated lift beneath the headframe. At the Horse Thief Canyon end, ore bins and a short trestle need to be built for the transfer of ore to TMMC trains. Also, if I can find the room, there may be a small turntable and engine shops in Big Thunder Camp. 

Summing up, I was a little sad to let go of the whole Calico mini-layout idea, but part of the creative process is knowing when things just aren't going to work and making the proper adjustments. I haven' given up on Calico Mountain, far from it, it just won't be a part of the On18 layout. But there'll be much more on that in an upcoming post. 

As always, I'll do my best to answer any questions in the comments below - so ask away! Just keep in mind that the WordPress platform is a spam magnet so it may take a little while for me to weed through and get to an answer. Thanks for checking in, amigos. Adios for now!