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Prop Shaft Material |
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Material |
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Yield / TS (psi) |
Mod Elas (psi) |
Density (lb/cu.in) |
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1 |
Aquamet 22 |
70,000 |
0 |
28,000,000 |
0 |
0.285 |
0 |
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2 |
Aquamet 18 |
60,000 |
0 |
28,800,000 |
0 |
0.281 |
0 |
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3 |
Aquamet 17 |
70,000 |
0 |
28,500,000 |
0 |
0.284 |
0 |
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4 |
Monel 400 |
40,000 |
0 |
26,000,000 |
0 |
0.319 |
0 |
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5 |
Monel K500 |
67,000 |
0 |
26,000,000 |
0 |
0.306 |
0 |
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6 |
Tobin Bronze |
20,000 |
20000 |
16,000,000 |
16,000,000 |
0.304 |
0.304 |
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7 |
Inox 304 (Stainless) |
20,000 |
0 |
28,000,000 |
0 |
0.206 |
0 |
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Enter material no 1-7 |
6 |
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20000 |
Selected material Yield strength PSI |
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0.304 |
Selected material density |
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16,000,000 |
Selected material elasticity |
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Tobin Bronze has become
an unfashionable material for propshafts lately, and preference given to
"stainless" |
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steels.
This is unfortunate, since these steels are far more brittle and prone to
shear, though these properties |
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are useful in long
shafts driven by powerful motors. However a stainless shaft carrying a bronze
prop |
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is a source of galvanic
corrosion. NEVER under-specify
propshaft or thrust bearing equipment. At best |
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you may shear the shaft
and lose all power, at worst you have a hole below waterline of propshaft
diameter. |
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