boat_lift_failure - On August 3 1997 vessel fell from davit...

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1995 Monterrey 256 Cruiser – 300-HP Mercury I/O On August 3, 1997, vessel fell from davit cradle, causing personal injury to operator. Photograph taken on 2/25/98 – davit components have been replaced.
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Photograph by Davit Masters – 8/4/1997
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Closer view of area where plaintiff claims that failure of the I-beam occurred. Note location of failure with respect to: port side attachment point of beam principal axes of I-beam [X-X, Y-Y] beam is a “W shape”, 6WF9 designation beam length is 12 feet [144 inch long] load distributed on cradle at two points
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outboard outboard suspension suspension point point cradle cradle support support base base Schematic showing deformation in I-beam Schematic showing deformation in I-beam 4' 3' 5' ~4" Note that force has to be applied in the same direction as the deformation [web deflection] that is produced: Y Y X X force force
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In addition to the I-beam web, there was mechanical damage to the flange as well….
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~20 o Again, deflection in direction of applied force… force force
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Inboard rear pipe drive – note configuration of cable wrap… Compare to inboard front pipe drive cable wrap configuration
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incident reconstruction must contain a sequence of events incident reconstruction must contain a sequence of events which provide explanations for the obvious: which provide explanations for the obvious: damage to rear cradle support I-beam web – explain location damage to rear I-beam flange – only one cradle upright affected position of I-beam/cradle assembly after incident configuration of front and rear cable wraps on pipe drives sequence of events during incident – operator actions, boat behavior time line leading up to incident in addition, physical evidence must conform to sequence of events in addition, physical evidence must conform to sequence of events
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Invoice to Installer Invoice to Installer
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Cradle lift system selected for plaintiff’s property was a 7M model, designed to support a maximum of 7000#, distributed over two supports which were 13’ long, centered on 12’ I-beams which were 11’ apart.
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[email protected] or 6WF9 designates a wide flanged I-beam with a 6” web and a 4” flange which weighs 9# per foot of length. 50 ksi steel refers to a steel with yield strength of 50,000 psi. center loaded designates a configuration in which a beam, supported at either end, has the entire load applied to a point equidistant from its ends. a kip is a load of 1000 pounds. Some terms or definitions: Some terms or definitions:
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0.05 max 0.04 max 0.75 0.2 0.26 A36 S, w/o P, w/o Mn, w/o Cu, w/o C, w/o ASTM A36 low carbon structural steel [www.matls.com] ASTM A36 low carbon structural steel [www.matls.com] 29,008 23% 58.0-79.8 36.3 7.85 A36 modulus of elasticity, ksi EL at fracture σ t , ksi σ y , ksi ρ , g/cm 3 alloy composition alloy composition mechanical properties mechanical properties
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note yield strength values for A36 versus high strength low alloy steels
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center loading configuration center loading configuration cradle [two-point] loading, cradle [two-point] loading, similar to configuration for the similar to configuration for the Davit Master design Davit Master design
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boat_lift_failure - On August 3 1997 vessel fell from davit...

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