SV Panopevidéo
Rudder Stock and Quadrant Stress Tests
3 février 2025 · 21 min · 3K vues
Ce que couvre cette vidéo
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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