I have designed (the scale model) and build a few steam loco and so far, I did not have yet to compromised on neither driver size or center to center distance although it was close for my current project, a USRA 2-10-2. The prototype had a blind center driver but still could use a flanged center driver no problem.
But I thought of it before and my choice would be, if I have to make a compromise for scale operation, to use slightly undersize driver. The reasons been: 1. the oversize flange (RP25, not AF) already increase the overall wheel diameter. Reducing the diameter on the scale model for a total overall scale to the flange will not IMO be distractive. (well, with RP25 flanges, with AF flanges it is distractive) 2. RR were re-turning the drivers over the years and all the engines I have measured in museum, had their drivers smaller than their specification, by almost an inch for some. Simon Parent -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of richgajnak Sent: December-22-12 3:02 PM To: [email protected] Subject: {S-Scale List} Re: Drivers and Flanges There's several ways a manufacturer can deal with drivers. 1: Correct driver size and space out axles to compensate for flanges. This is the least desirable, it may require "stretching" the locomotive to look right. 2: Correct axle spacing, correct driver size, blind center drivers. 3: Correct Axle spacing, undersize drivers, enough to compensate for all wheels flanged. But, all is not lost. There is some built in leeway. There is some space between the flanges on the prototype. Prototype wheels not flange-to-flange with no space inbetween. On the N&W Y6b 2-8-8-2 for example, the driver size was 58". The axles were spaced 63" apart. That's a whole 5"(a little less than 3/32" in S)to play with. Rich G(ajnak) --- In [email protected], Robert Lampe <danceswithwolves49@...> wrote: > > Changing hi-rail wheels for scale in a diesel wouldn't be so bad but it would seem to me that the drivers on a steamer would present a problem. The side rods would have to be made anew in order to fit unless the drivers tire diameter itself were of a scale diameter to begin with. When i was in HO a lot of foreign imports used high flanges on the wheels this presented a problem when running on code 70 rail which was the norm back then for scale appearance. the flanges rode on top of the ties so a lot of guys who had the means turned the flanges or else bought custom drivers or replaced wheels with those that had smaller flanges. > > To: [email protected] > From: brian__jackson@... > Date: Sat, 22 Dec 2012 17:14:39 +0000 > Subject: {S-Scale List} Re: The Y3 > > > > > > > > > > > > > > > > > > > > > > > > > > > I bet Jim Kindraka has experience in this and can explain. > > > > Brian Jackson > > --- In [email protected], "Brian Jackson" <brian__jackson@> wrote: > > > > > > Bob, > > > > > > I'm pretty sure even brass locos designed for Code 110 operation from the outset use larger spacing between drivers than the prototype. So maybe there is already built-in slack? > > > > > > Brian Jackson > > > > ------------------------------------ Yahoo! Groups Links ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
