Inertia Conversion TablesTo convert from A to B multiply by entry in table. | ||||||||||
| A\B | lb•ft2 | lb•ft•s2 or slug-ft2 | lb•in2 | lb•in•s2 | oz•in2 | oz•in•s2 | kg•cm2 | kg•cm•s2 | g•cm2 | g•cm•s2 |
|---|---|---|---|---|---|---|---|---|---|---|
| lb•ft2 | 1 | 3.108 x 10–2 | 144 | 0.373 | 2.304 x 103 | 5.968 | 421.4 | 0.4297 | 4.214 x 105 | 429.71 |
| lb•ft•s2 | 32.174 | 1 | 4.633 x 103 | 12 | 7.413 x 104 | 192 | 1.356 x 104 | 13.825 | 1.356 x 107 | 1.383 x 104 |
| lb•in2 | 6.944 x 10–3 | 2.158 x 10–4 | 1 | 2.590 x 10–3 | 16 | 4.144 x 10–2 | 2.926 | 2.984 x 10–3 | 2.926 x 103 | 2.984 |
| lb•in•s2 | 2.681 | 8.333 x 10–2 | 386.1 | 1 | 6.177 x 103 | 16 | 1.130 x 103 | 1.152 | 1.130 x 106 | 1.152 x 103 |
| oz•in2 | 4.34 x 10–4 | 1.349 x 10–5 | 6.25 x 10–2 | 1.619 x 10–4 | 1 | 2.59 x 10–3 | 0.183 | 1.865 x 10–4 | 182.901 | 0.186 |
| oz•in•s2 | 0.168 | 5.208 x 10–3 | 24.13 | 6.25 x 10–2 | 386.088 | 1 | 70.616 | 7.201 x 10–2 | 7.0616 x 104 | 72.008 |
| kg•cm2 | 2.373 x 10–3 | 7.376 x 10–5 | 0.3417 | 8.851 x 10–4 | 5.467 | 1.416 x 10–2 | 1 | 1.0197 x 10– | 1000 | 1.0197 |
| kg•cm•s2 | 2.327 | 7.233 x 10–2 | 335.109 | 0.8679 | 5.362 x 103 | 13.887 | 980.665 | 1 | 9.807 x 105 | 1000 |
| g•cm2 | 2.373 x 10–6 | 7.376 x 10–8 | 3.417 x 10–4 | 8.851 x 10–7 | 5.467 x 10–3 | 1.416 x 10–5 | 10–3 | 1.0197 x 10– | 1 | 1.0197 x 10–3 |
| g•cm•s2 | 2.327 x 10–3 | 7.233 x 10–5 | 0.3351 | 8.680 x 10–4 | 5.362 | 1.389 x 10–2 | 0.9807 | 10–3 | 980.667 | 1 |
| Example: Convert a rotor inertia of 90 g•cm2 to oz•in•sec2; The multiplier from the table above is 1.416 x 10–5; The new inertia = 90 x 1.416 x 10–5 = 1.27 x 103 oz•in•sec2 | ||||||||||