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SELECTION GUIDE

Section properties of Ronstan beam tracks (moments of inertia, centroid, cross-sectional area, alloy yield values) and the minimum bend radius for each traveller car length, to size a spanning traveller or order a curved track.

DocumentRonstan Track Sectional, Mechanical & Curved Track Data
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Ronstan Track Sectional Mechanical DataPDF · 1 p.Curved track data (minimum bend radius)PDF · 1 p.
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Ronstan Track Sectional, Mechanical & Curved Track Data

Beam Track Sectional & Mechanical Data

  • Beam tracks span cockpits, companionways and unsupported deck sections where fastening options are restricted, or to avoid building extra support structure into the boat. Have the designer or builder choose the section for the application.
  • Beam tracks for ball bearing cars are supplied without holes; custom hole arrangements can be drilled on request.
Section Ix Iy y (centroid) CSA
RC6190 14294mm4 (0.0343in4) 4219mm4 (0.0101in4) 12.56mm (0.4945") 196mm² (0.3038in²)
RC6320 59000mm4 (0.1417in4) 30360mm4 (0.0729in4) 16.96mm (0.6677") 471mm² (0.7301in²)
RC1225B-2.0 133881mm4 (0.3217in4) 98716mm4 (0.2372in4) 20.2mm (0.7957") 836 mm² (1.2969in²)
RC1225-3.0 664730mm4 (1.5970in4) 184248mm4 (0.4427in4) 42.3mm (1.6654") 768mm² (1.1904in²)
RC1305B-3.0 338641mm4 (0.8136in4) 202808mm4 (0.4872in4) 26.9mm (1.0591") 1051mm² (1.6291in²)
RC1425-3.0 797749mm4 (1.9166in4) 558530mm4 (1.3419in4) 34.7mm (1.3611") 1687mm² (2.6149in²)
Material Applies to Values printed as σ yield
Aluminium alloy AL6005-T6 All tracks unless otherwise stated 225 MPa (32.6 ksi); 270 MPa (39.2 ksi)
Aluminium alloy AL6063-T6 RC1225-3.0 170 MPa (24.7 ksi); 215 MPa (31.2 ksi)
Aluminium alloy AL6061-T6 RC6190, RC6320 240 MPa (34.1 ksi); 290 MPa (42.1 ksi)

Two values are printed for each alloy, both labelled σ yield (as printed). Section drawings with overall dimensions below.

Ronstan beam track section drawings RC6190, RC6320, RC1225B-2.0, RC1225-3.0, RC1305B-3.0, RC1425-3.0

Minimum Bend Radius by Car Length

Traveller series Car length mm Min. horizontal A-bend radius mm Min. horizontal B-bend radius mm Car length in A-bend radius in B-bend radius in
Series 14 47 1300 800 1 27/32 51 7/32 31 17/32
50 1400 970 1 31/32 55 1/8 38 7/32
68 2000 2000 2 11/16 78 13/16 78 13/16
78 3500 4500 3 1/16 137 29/32 177 5/16
Series 19 50 1500 1500 1 31/32 60 27 29/32 (as printed)
70 2500 3000 2 3/4 98 1/2 118 3/16
85 3500 4500 3 11/32 137 29/32 177 5/16
100 5000 5500 3 15/16 197 216 11/16
Series 22 75 1500 2000 2 31/32 59 3/32 78 13/16
125 5000 5000 4 15/16 197 197
175 9000 13000 6 29/32 354 19/32 512 3/16
180 9000 13000 7 3/32 354 19/32 512 3/16
Series 26 108 2500 2500 4 1/8 98 13/32 98 13/32
120 4000 4000 4 23/32 157 19/32 157 19/32
200 8000 8000 7 7/8 315 3/16 315 3/16
205 9000 9000 2 1/16 (as printed) 354 19/32 354 19/32
210 9400 9400 8 1/4 370 3/32 370 3/32
Series 30 100 2500 2500 3 15/16 98 1/2 98 1/2
108 2875 2875 4 1/4 113 3/16 113 3/16
120 4900 4900 4 23/32 192 1/32 192 1/32
150 8000 8000 5 29/32 315 3/16 315 3/16
210 12400 12400 8 1/4 488 3/16 488 3/16
225 16000 16000 8 7/8 630 13/32 630 13/32
332 22500 22500 13 1/16 885 13/16 885 13/16
I-Track 19 51 400 400 * 2 15 3/4 15 3/4
86 1200 Not suitable 3 3/8 47 1/4 Not suitable
I-Track 32 76 500 500 * 3 19 11/16 20 (as printed)
157 500 Not suitable 6 3/16 19 11/16 Not suitable

Ball bearing traveller Series 14 to 30 and I-Track. * B-bends for I-Track 19 and 32 have length and radius limitations: ask with your requirements. Ronstan gives minimum bend radii for Series 42 and 55 traveller cars on request.

A-Bend and B-Bend

  • 'A' bend (horizontal, plan view): for cars and fittings that rotate around a central pivot, so the load on the car stays vertical; keeps full strength, free rolling and constant purchase tension (mainsheet and boom vang travellers).
  • 'B' bend (vertical, concave or convex, top mounted or underhung): to match deck camber, or to keep constant tension in a purchase on the car, popular on mainsheet and self-tacking jib systems.
  • In a ball bearing system a bend can reduce the load capacity by loading the balls unevenly along the car. Not all track types take both bends and some cannot be curved at all.
  • The minimum radius is the tightest curve the car will run around freely. Light bends can be "sprung in" during installation, taking great care to keep the curve even, with no tight spots and no permanent deformation; for best results order the track pre-bent.

Ordering a Curved Track

  1. Specify the track profile by product no.
  2. Indicate the bend: 'A' (horizontal) or 'B' (vertical), concave or convex.
  3. Give two critical dimensions (three if possible) and clear drawings where possible: radius R and offset O, or R and track length L, or R and chord length C, or offset O and chord length C.
  4. Where R is not known it is easiest to specify C and O; the radius the track follows MUST then be constant.

Need a part that isn't listed? Ask us to source it and quote the part number from the PDF.

Products in this Selection Guide