[Original Message>From: Paul Brezicki [mailto:doctorpb_@_bellsouth.net] Sent: Tuesday, September 30, 2008 6:44 AM There are several ways of superelevating curves on model RR's. Probably the superior way is to use spline subroadbed and superelevate that.] Since superelevation on model railroads is a tricky proposition, the best way is that way whose "technology" is somehow most concordant with the skill sets and favorite materials of the builder. For superelevation I put meticulous efforts into having vertical risers for the subroadbed that were cut to the correct angles and carefully fixed in place and also level per the inside track. This was especially critical in the transitions/easements. The subroadbed was 3/4" ply precut to the track plan configuration that was then just power-screwed to conform to the angulation of these risers (this also presumes benchwork that is strong enough to deal with the moderate torque involved). The 3/4" ply has its own way of also making a nice smooth transition with no need to sand. I have used 5-degree geometric angles (roughly 5-inch superelevation) on all curves (48" minimum) with transition lengths of 24" to 50". I wouldn't hardsell this method to anyone, but I personally have been extremely happy with the flowing smoothness of the outcome in both appearance and especially in operation. Joe Braun The Erie Lackawanna Mailing List http://EL-List.railfan.net/ To Unsubscribe: http://Lists.Railfan.net/erielackunsub.html ------------------------------
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