N scale Helix - Minimum Space Requirements

PMR N scale 1 track and 2 track helixes require the following space as shown in the table below. For 2 track helixes, use the outer radius of your helix to lookup the space required.

(The helix will fit in a circle with radius that is 1 1/2" greater than the track radius. For convenience, the minimum space listed in the table below shows this as length x width.)

Radius Space Required (length x width) Radius Space Required (length x width)
13.5" 343mm 30" x 30" 76cm x 76cm 20.0" 508mm 43" x 43" 109cm x 109cm
14.0" 356mm 31" x 31" 79cm x 79cm 20.5" 521mm 44" x 44" 112cm x 112cm
14.5" 368mm 32" x 32" 81cm x 81cm 21.0" 533mm 45" x 45" 114cm x 114cm
15.0" 381mm 33" x 33" 84cm x 84cm 21.5" 546mm 46" x 46" 117cm x 117cm
15.5" 394mm 34" x 34" 86cm x 86cm 22.0" 559mm 47" x 47" 119cm x 119cm
16.0" 406mm 35" x 35" 89cm x 89cm 22.5" 572mm 48" x 48" 122cm x 122cm
16.5" 419mm 36" x 36" 91cm x 91cm 23.0" 584mm 49" x 49" 124cm x 124cm
17.0" 432mm 37" x 37" 94cm x 94cm 23.5" 597mm 50" x 50" 127cm x 127cm
17.5" 445mm 38" x 38" 97cm x 97cm 24.0" 610mm 51" x 51" 130cm x 130cm
18.0" 457mm 39" x 39" 99cm x 99cm 24.5" 622mm 52" x 52" 132cm x 132cm
18.5" 470mm 40" x 40" 102cm x 102cm 25.0" 635mm 53" x 53" 135cm x 135cm
19.0" 483mm 41" x 41" 104cm x 104cm 25.5" 648mm 54" x 54" 137cm x 137cm
19.5" 495mm 42" x 42" 107cm x 107cm 26.0" 660mm 55" x 55" 140cm x 140cm