SV Panopevídeo
Rudder Stock and Quadrant Stress Tests
3 de febrero de 2025 · 21 min · 3K visitas
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Steve Goodwin tests the rudder stock and steering quadrant on Panope by pulling machined aluminum samples and the actual stock assembly to destruction or yielding using a come-along, a load cell, and a remote readout.0:37 Tensile tests on machined coupons confirm the rudder stock is 6061 T6 aluminum, breaking at 44,000 PSI — within the expected range.0:50 A deliberately annealed sample fails at 26,600 PSI, 40 percent weaker, establishing the heat-affected zone risk from welding.3:03 The torque test rigs the actual stock and a shop-built steering quadrant against a tree and house foundation; the stock itself does not bend or twist, but the six grade-8 quarter-inch quadrant bolts deflect more than 25 degrees, bending into a double-Z shape and elongating their holes.6:00 An engineer estimates the stock reached roughly 29,000 PSI in torsion — near the 30,000 PSI shear strength of 6061 T6 — but a keyway cut into the test sample, not the welds, proves to be the weak point.7:24 Upgrading the quadrant bolts to 5/16-inch is the one confirmed improvement Goodwin plans to make on the actual boat.19:10 Normal helm loads of 20–50 pounds represent about one-tenth of the stock's yield threshold, giving a safety margin large enough to make fatigue failure negligible.18:10 Quarter-inch steering cables, calculated to see 5,000–6,000 pounds at stock-bending loads, match their rated breaking strength and are identified as the most likely first failure point in a severe overload.18:36
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