Jim, I'm guessing 2 percent is the grade you need for easy pulling, but 2.8 is almost 3 percent. Is that too steep for a S scale helix? Jack Bartman
Oh boy, a math puzzle.... (GRIN) Let's see if the little gray cells are working...! In this scenario, to keep the radius at 23" (46" diameter), you would have to increase the rate of elevation to 2.8%. Conversely, to hold it to a 2% rise, you would need to increase the radius to just under 31"... right? Jim Kindraka Plymouth, WI --- In [email protected]_ (mailto:[email protected]) , "scale S only" wrote: > > Hi Jack -- > > No, it is not possible. 46†diameter works out to about 12 feet of run > per circle of track (presuming that you are also limiting the whole helix to > 48†x 48â€) whereas to gain the requisite 4†between levels will take 16 feet > at approximately 2%. Now if you stretch the helix into an oval, you can > see that you can do it in 48 x 72â€. I used 4†between levels which gives > you approximately one inch for benchwork to support the track, but > practically no clearance for the trains. > > I hope this helps! > Bill Winans > ------------------------------- > > Would anyone know if it is possible to design a working helix that has a > track diameter of 46 inches, would fit on 48 inch table, rise 15 inches at 2 > percent grade? > > Jack >
