Below we have listed physical properties for both our E-Glass/Epoxy and Carbon/Epoxy battens.
At the bottom of the chart there is a brief discussion on the EI numbers, how we derived them and how they can help you in proper and exact batten selection for your sails.
| E-Glass Epoxy – Non Tapered – |
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|---|---|---|---|---|---|---|
| RBS Battens | Flexural Stiffness | Flexural Stiffness | 3 Point Deflection | Weight per Meter | Available Lengths | |
| Order Code | Spring Rate | Beam Theory, E.I | 10 Lbs – 1 m | |||
| Lbs/Inches | NM^2 | Inches | mm | Grams | mm | |
| E38540 | 78.12 | 285.1 | 0.128 | 3.3 | 1048 | 10660 |
| E25500 | 41.67 | 152.1 | 0.240 | 6.1 | 592 | 9144 |
| E25400 | 21.74 | 79.4 | 0.460 | 11.7 | 485 | 9144 |
| E25350 | 15.04 | 54.9 | 0.665 | 16.9 | 424 | 6100 |
| E25300 | 9.35 | 34.1 | 1.070 | 27.2 | 362 | 6100 |
| E25265 | 6.72 | 24.5 | 1.488 | 37.8 | 323 | 6100 |
| E19400 | 16.53 | 60.3 | 0.605 | 15.4 | 364 | 6100 |
| E19350 | 11.48 | 41.9 | 0.871 | 22.1 | 320 | 6100 |
| E19300 | 7.12 | 26.0 | 1.405 | 35.7 | 275 | 6100 |
| E19265 | 4.90 | 17.9 | 2.040 | 51.8 | 239 | 6100 |
| E19230 | 3.13 | 11.4 | 3.200 | 81.3 | 206 | 6100 |
| E19200 | 2.31 | 8.4 | * 2.160 | 54.9 | 185 | 6100 |
| E19180 | 1.65 | 6.0 | * 3.030 | 77.0 | 167 | 6100 |
| E19160 | 1.26 | 4.6 | ** 1.780 | 45.2 | 148 | 6100 |
| E15300 | 5.79 | 21.1 | 1.728 | 43.9 | 215 | 6100 |
| E15265 | 4.03 | 14.7 | 2.480 | 63.0 | 192 | 6100 |
| E15230 | 2.67 | 9.7 | 3.750 | 95.3 | 165 | 6100 |
| E15200 | 1.81 | 7.4 | * 2.763 | 70.2 | 148 | 6100 |
| E15180 | 1.31 | 4.8 | ** 1.715 | 43.6 | 130 | 6100 |
| E15160 | 0.95 | 3.5 | ** 2.34 | 59.4 | 117 | 6100 |
| E15140 | 0.58 | 2.1 | *** 1.605 | 40.8 | 98 | 6100 |
| E10300 | 3.99 | 14.6 | ** 0.562 | 14.3 | 146 | 6100 |
| E10265 | 2.65 | 9.7 | ** 0.848 | 21.5 | 127 | 6100 |
| E10230 | 1.85 | 6.8 | ** 1.211 | 30.8 | 110 | 6100 |
| E10200 | 1.18 | 4.3 | ** 1.898 | 48.2 | 95 | 6100 |
| E10180 | 0.86 | 3.1 | ** 2.595 | 65.9 | 85 | 6100 |
| E10160 | 0.62 | 2.3 | *** 1.495 | 38.0 | 75 | 6100 |
| E10140 | 0.46 | 1.7 | *** 2.018 | 51.3 | 67 | 6100 |
| E10120 | 0.33 | 1.2 | **** 0.700 | 17.8 | 56 | 6100 |
| E10100 | 0.26 | 0.9 | **** 0.910 | 23.1 | 48 | 4191 |
| E10090 | 0.23 | 0.8 | **** 1.000 | 25.4 | 44 | 4191 |
| * 5 lbs / 2.27 Kg weight used | ||||||
| ** 2.244 lbs / 1.019 Kg weight used | ||||||
| *** 0.933 lbs/ 0.423 Kg weight used | ||||||
| **** 0.234 lbs / 0.106 Kg weight used | ||||||
| Carbon/Epoxy –Non Tapered– |
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|---|---|---|---|---|---|---|
| RBS Battens | Flexural Stiffness | Flexural Stiffness | 3 Point Deflection | Weight per Meter | Available Lengths | |
| Order Code | Spring Rate | Beam Theory, E.I | 10 Lbs – 1 m | |||
| Lbs/Inches | NM^2 | Inches | mm | Grams | mm | |
| CB38400 | 105.26 | 384.21 | 0.095 | 2.4 | 588 | 9100 |
| CB38350 | 70.42 | 257.04 | 0.142 | 3.6 | 507 | 9100 |
| CB38300 | 43.86 | 160.09 | 0.228 | 5.8 | 438 | 9100 |
| CB38250 | 24.39 | 89.02 | 0.410 | 10.4 | 365 | 9100 |
| CB25400 | 66.67 | 243.33 | 0.150 | 3.8 | 382 | 6010 |
| CB25350 | 43.29 | 158.01 | 0.231 | 5.9 | 329 | 6010 |
| CB25300 | 27.03 | 98.65 | 0.370 | 9.4 | 284 | 6010 |
| CB25250 | 15.36 | 56.07 | 0.651 | 16.5 | 240 | 6010 |
| CB19400 | 50.76 | 185.28 | 0.197 | 5.0 | 292 | 6010 |
| CB19350 | 33.44 | 122.07 | 0.299 | 7.6 | 253 | 6010 |
| CB19300 | 21.74 | 79.35 | 0.460 | 11.7 | 218 | 6010 |
| CB19250 | 11.64 | 42.49 | 0.859 | 21.8 | 182 | 6010 |
| CB19200 | 6.88 | 25.12 | 1.453 | 36.9 | 151 | 6010 |
| CB15300 | 14.90 | 54.40 | 0.671 | 17.0 | 168 | 6010 |
| CB15250 | 9.80 | 35.78 | 1.020 | 25.9 | 150 | 6010 |
| CB15200 | 5.43 | 19.84 | 1.840 | 46.7 | 122 | 6010 |
| CB10250 | 6.51 | 23.76 | 1.536 | 39.0 | 98 | 6010 |
| CB10200 | 3.35 | 12.23 | *1.492 | 37.9 | 79 | 6010 |
| CB10150 | 1.54 | 5.63 | **1.455 | 37.0 | 61 | 6010 |
| CB10120 | 0.78 | 2.85 | **2.870 | 72.8 | 47 | 6010 |
| * 5 lbs / 2.27 Kg weight used | ||||||
| ** 2.244 lbs / 1.019 Kg weight used | ||||||
Carbon Equivalent Charts
Click here for a Printable PDF of this RBS Batten Carbon Equivalent Chart
| E-GLASS TO CARBON SUGGESTED/CLOSEST STIFFNESS EQUIVALENT | ||||||
|---|---|---|---|---|---|---|
| WEIGHT | E-GLASS | STIFFNESS | STIFFNESS | SUGGESTED CARBON EQUIVALENT |
WEIGHT | |
| 44 | E10090 | 0.8**** | n/a | n/a | n/a | |
| 48 | E10100 | 0.9**** | n/a | n/a | n/a | |
| 56 | E10120 | 1.2**** | n/a | n/a | n/a | |
| 67 | E10140 | 1.7*** | n/a | n/a | n/a | |
| 75 | E10160 | 2.3*** | n/a | n/a | n/a | |
| 85 | E10180 | 3.1** | = | 2.85** | CB10120 | 47 |
| 95 | E10200 | 4.3** | = | 5.63** | CB10150 | 61 |
| 110 | E10230 | 6.8** | = | 5.63** | CB10150 | 61 |
| 127 | E10265 | 9.7** | = | 12.23* | CB10200 | 79 |
| 146 | E10300 | 14.6** | = | 12.23* | CB10200 | 79 |
| 29 | E12050 | n/a | n/a | n/a | n/a | |
| 35 | E12060 | n/a | n/a | n/a | n/a | |
| 41 | E12070 | n/a | n/a | n/a | n/a | |
| 53 | E12090 | n/a | n/a | n/a | n/a | |
| 98 | E15140 | 2.1*** | n/a | n/a | n/a | |
| 117 | E15160 | 3.5** | = | 2.85** | CB10120 | 47 |
| 130 | E15180 | 4.8** | = | 5.63** | CB10150 | 61 |
| 148 | E15200 | 7.4* | = | 12.23* | CB10200 | 79 |
| 165 | E15230 | 9.7 | = | 12.23* | CB10200 | 79 |
| 192 | E15265 | 14.7 | = | 19.84 | CB15200 | 122 |
| 215 | E15300 | 21.1 | = | 19.84 | CB15200 | 122 |
| 148 | E19160 | 4.6** | n/a | n/a | n/a | |
| 167 | E19180 | 6* | n/a | n/a | n/a | |
| 185 | E19200 | 8.4* | = | 14.68* | CB15150 | 92 |
| 206 | E19230 | 11.4 | = | 19.84 | CB15200 | 122 |
| 239 | E19265 | 17.9 | = | 25.12 | CB19200 | 151 |
| 275 | E19300 | 26 | = | 25.12 | CB19200 | 151 |
| 320 | E19350 | 41.9 | = | 42.49 | CB19250 | 182 |
| 364 | E19400 | 60.3 | = | 79.35 | CB19300 | 218 |
| 323 | E25265 | 24.5 | = | 25.12 | CB19200 | 151 |
| 362 | E25300 | 34.1 | = | 42.49 | CB19250 | 182 |
| 424 | E25350 | 54.9 | = | 56.07 | CB25250 | 240 |
| 485 | E25400 | 79.4 | = | 98.65 | CB25300 | 284 |
| 592 | E25500 | 152.1 | = | 158.01 | CB25350 | 329 |
| 1048 | E38540 | 285.1 | = | 384.21 | CB38400 | 588 |
Batten material properties above are explained in terms of weight and stiffness.
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For weight (or mass) we use grams. (One gram equals 0.0022 lb., 1000 g or 1 Kg = 2.205 lb.)
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For stiffness we use two expressions; Spring Rate and EI-Beam Theory numbers.
Battens are used to stabilize sail shape, and are used primarily for their rigidity or stiffness.
“Spring Rate” numbers and “EI” numbers are values used to quantify this flexural rigidity or bending stiffness property of a batten due to the material properties combined with the geometry or shape and size of the batten.
“Spring Rate” numbers and “EI” numbers are values used to quantify this flexural rigidity or bending stiffness property of a batten due to the material properties combined with the geometry or shape and size of the batten.
“Spring Rate” is the ratio of the weight in lb. over the deflection in inches using a constant beam span (1 m). For the same beam geometry, and when using a constant beam span of 1 meter, the correlation factor between Spring Rate and EI is 3.65 (EI = 3.65 X SR).
SR = Bending stiffness (ratio weight over deflection) (lbs/inches)
According to Beam Theory, the bending stiffness of a beam, E.I, is defined as the product of the modulus of elasticity (E) (also called Young’s Modulus) and the moment of inertia (I) (also called mass moment of inertia). Metric units are in kilograms and meters (Kgf = 9.807 N)
E = E-modulus (N/m^2 = Pa)
I = Moment of inertia (m^4)
EI = Bending stiffness (product of E and I) (Nm^2) (or more commonly Nm^2)
EI-Beam Theory values were all measured and calculated using standard engineering calculations that give a bending stiffness value in Nm^2. The deflection (d) is measured at the center of the beam length, and is related as d = PL^3/48IE. We note that it is proportional to the load P, to the cube of the span L, and inversely proportional to the flexural rigidity IE. Solving for EI = PL^3/48d. For this calculation, any span and load can be used, making sure that the deflection doesn’t excessively sag the batten and change the measured length of the batten.
[button link=”mailto:info@rbsbattens.com?subject=Comments%20from%20the%20Deflection%20Chart” linking=”default” size=”medium” type=”wide” title=”Feel free to email us with any questions or discussions.”]Feel free to email us with any questions or discussions.[/button]Most of the deflections were measured using a 10 lb. weight for the deflection. Values preceded with a “*” were measured at the lower weights indicated, yielding higher accuracy.
PS>
Visco-elastic properties affecting dynamic batten response are not reflected by the E.I values, as they are more material property related (E-Glass, Carbon, Epoxy, interfacial adhesion, …)