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Old 01-14-2014, 12:06 PM   #1 (permalink)
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Default Johnson 16 wheeler



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Old 01-14-2014, 12:24 PM   #2 (permalink)
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Default RE: Johnson 16 wheeler

Victor;

That is quite a contraption. It probably sounded like it was doing 100mph when it was barely crawling.

Thanks for the photos.

Best,
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Old 01-14-2014, 09:44 PM   #3 (permalink)
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Default RE: Johnson 16 wheeler

Didn't want to post anything until I was sure the dang thing would even work, so the teaser pics above. Heres the meat and potatoes cooking away:


Chassis of basswood, pilot wheels from Bachmann Bug Maulers




Wheel articulation, this WILL run on the 21" pizza!



This will be a non-powered pusher engine, with the motor in a trailing car pushing it around the pizza. this set-up allows me to build interesting engines that are not powere-able using conventional sources, more to come
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Old 01-14-2014, 10:00 PM   #4 (permalink)
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Well, this should be really interesting! I like how you got all those pilot wheels in there. :-)
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Old 01-14-2014, 11:00 PM   #5 (permalink)
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Default RE: Johnson 16 wheeler

I've always been intrigued by that beast.

I can't wait to see your build.
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Old 01-15-2014, 09:10 AM   #6 (permalink)
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Default RE: Johnson 16 wheeler

pilot wheels from Bachmann Bug Maulers
So that's why you've been looking for Big Hauler pilots! Looks great.
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Old 01-15-2014, 02:10 PM   #7 (permalink)
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Default RE: Johnson 16 wheeler

Vic, going where no man has ventured before him.
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Old 01-15-2014, 05:25 PM   #8 (permalink)
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Default RE: Johnson 16 wheeler

Another shot of the Johnson 16 (you've seen this I'm sure),



The caption from the site (http://www.trainweb.org/nzgearedloc...n-p-1.html) points out that these are wooden rails. And those are wide wheels! I guess that's the point of all the wheels, load distribution?

Wonder how they "threw" the wooden switch... maybe literally throwing a board?!

Anyway, great project Vic, I'm looking forward to seeing your progress!

Cliff
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Old 01-16-2014, 01:12 PM   #9 (permalink)
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Default RE: Johnson 16 wheeler

Vic,
The prototype pics show a central gear transfer case between the trucks - a bit like a Climax ? Were all wheels driven, or just a few ?
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Old 01-16-2014, 03:07 PM   #10 (permalink)
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Default RE: Johnson 16 wheeler

Not to butt in Pete, but here's a relevant paragraph from that trainweb site:

Designed as a replacement for horse teams, the axle loading of 1 tonne per axle was arrived at as being similar to that achieved on log buggies. The loco weighed in at 16.25 tons. A twin-cylinder vertical marine type engine was cab mounted and drove a longitudinal crankshaft that in turn drove an intermediate shaft via spur gears giving two speeds of ratios 1:1 and 1:2. The intermediate shaft then drove another set of spur gears down to the level of the line shaft. The lower, larger gear was 3ft 6in (1067 mm) in diameter. The line shaft was set just above the truck axles and a bevel gear pair drove from the line shaft to a stub shaft aligned across the truck. A pair of spur gears then transmitted power down to the axle. In all a total of 38 gears were in the transmission. The use of bevels on the stub shaft gave rise to high tooth stress and rapid wear. The wheels were carried on four trucks, the front two trucks being joined by a beam pivoted on the trucks and again at its mid-point where it was attached to the loco frame. The rear trucks were arranged the same. Top speed was about 5 mph (8km/h) and the average service life about 23 years. None exist today. The above image clearly shows the location of the twin cylinders and the reduction gears to the drive train. The loco worked at the Glenham Sawmilling Co. in 1910.
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