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PFM White pass & Yukon mikado
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Robert Bell
John and Bob, I think the PFM 70 class is "closest" to the 70, but not exact. The real 70 had an air tank on the firman's side AND on the engineer's side. The model has two on the fireman's side of the boiler - similar to the 72/73. Rob Bell Modeling the White Pass & Yukon Route in HOn3 Waynesville, NC
On Tuesday, February 9, 2021, 11:12:54 PM EST, John Stutz <john.stutz@...> wrote:
Bob
Attached is a photograph of WP&Y 71, probably taken by the Dedman Studio photographer during initial trials. This is he online versionof item
05202_141 in the Royal Museum of British Colombia collection.
The 70 was initially very similar, except 70 had conventionally located air tanks under the left running board, and the exhaust steam injector was on the right side. Both initially had a single phase air pump on each side, and the narrow bunker tender show here. Both engines were subsequently rebuilt with exhaust steam injectors removed, a cross-compound air pump on the left side, and fitted with much larger former USATC tenders. The 71 retained the front mounted air tank. I have not attempted to determine the order or timing of these changes, but believe that all occurred after USATC's departure.
The 72 & 73 were supplied in 1947, with single sand dome, a cross-compound air pump, conventional air tanks, and arranged to use USATC tenders. All four were initially coal burners, and converted to oil in the 1950s.
So I believe that the PFM model is specific to the rebuilt 70, but should give a reasonable 73 or 73 by removing the rear sand dome.
John Stutz
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John Stutz
Bob
Attached is a photograph of WP&Y 71, probably taken by the Dedman Studio photographer during initial trials. This is he online versionof item
05202_141 in the Royal Museum of British Colombia collection.
The 70 was initially very similar, except 70 had conventionally located air tanks under the left running board, and the exhaust steam injector was on the right side. Both initially had a single phase air pump on each side, and the narrow bunker tender show here. Both engines were subsequently rebuilt with exhaust steam injectors removed, a cross-compound air pump on the left side, and fitted with much larger former USATC tenders. The 71 retained the front mounted air tank. I have not attempted to determine the order or timing of these changes, but believe that all occurred after USATC's departure.
The 72 & 73 were supplied in 1947, with single sand dome, a cross-compound air pump, conventional air tanks, and arranged to use USATC tenders. All four were initially coal burners, and converted to oil in the 1950s.
So I believe that the PFM model is specific to the rebuilt 70, but should give a reasonable 73 or 73 by removing the rear sand dome.
John Stutz
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Robert Bell
Bob, All 500 of the PFM 70 class Mikados were built in 1968. They all had 3-domes. If you want a two dome version, the easiest is to just remove the rear sand dome. But, the real 72 and 73 had a larger steam dome and a larger single sand dome. So, what I did on mine was remove all of the domes, the old steam dome becomes the new sand dome, and a new dome from PSC was installed as the larger steam dome. On mine, I have also modified/replaced the air pump & piping, air tank, injector pipes, headlight, and running boards to better represent the 72 circa 1959. The one running at Dollywood is the 70 which has three domes. Motor wise, the 15mm square Minibea is perfect. I think I sent you photos of the motor mount I made for mine. Use 1mm I.D. silicone tubing (also from China for about $1-$2/meter) to connect the motor shaft to the stock gear train. I liked this motor so much that I ripped out the 16x30mm Sagami I had installed back in the early 1990s out and sold it on eBay - somebody bid $60 for it. The motors from China cost me about $20 for 10 of them!!! If you want more photos of my project, I can send you some. Rob Bell Modeling the White Pass & Yukon Route in HOn3 Waynesville, NC
On Monday, February 8, 2021, 04:40:17 PM EST, Robert Veefkind via groups.io <snookdust@...> wrote:
Any info on this model with 2 sand domes? Looks like early stuff maybe 1970 or so. The prototype still running at Dollywood. Looks like a good candidate for a Sagami 1630 which are hard to find. There are a few Faulhabers on ebay but all gearheads. Some of you gents have been finding all kinds of stuff from China, anything close to a long shaft 1630 Sagami ? Any info is appreciated. Bob Veefkind
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Robert Veefkind
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How about a Minebea 15 mm square with a Hobbytown universal to connect it to the gear box?
toggle quoted messageShow quoted text
Look at this <https://www.ebay.com/itm/Minebea-15MM-15MM-Square-Mini-DC-Motor-DC-12V-6500RPM-Large-Torque-6-Pole-Rotor-/262928506587>, for example. I used one in a Westside SP 4-8-0 for my Dad and it works great. HTH Bill Lugg
On 2/8/21 2:40 PM, Robert Veefkind via groups.io wrote:
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Robert Veefkind
Any info on this model with 2 sand domes? Looks like early stuff maybe 1970 or so. The prototype still running at Dollywood. Looks like a good candidate for a Sagami 1630 which are hard to find. There are a few Faulhabers on ebay but all gearheads. Some of you gents have been finding all kinds of stuff from China, anything close to a long shaft 1630 Sagami ? Any info is appreciated. Bob Veefkind
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