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Statics Challenge. J. W. Eischen. Precision Engineering Center Lunch Seminar March 4 , 2011. Early Boeing 747 Engine Mount Issue. Original Design- statics. floating mount - weight and maneuver loads. s ingle thrust mount . R f. H r. R r. d ( turbine case offset). T. L.
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Statics Challenge J. W. Eischen Precision Engineering Center Lunch Seminar March 4, 2011
Original Design- statics floating mount - weight and maneuver loads single thrust mount Rf Hr Rr d (turbine case offset) T L causes ovalization
Original Design- statics Rf Hr Rr d M T L
Early Boeing 747 Engine Mount Issue 34- load pickup member 66- pin 44- thrust block 46,48- mount rails 50,52- slider blocks 62,64- holes
Improved Design- statics floating mount - weight and maneuver loads Rt axial sliding mount Rf d(1-cos(60)) Rr a dcos(60) T L
Improved Design- statics Rt Rf d(1-cos(60)) Rr a dcos(60) M T L bending moment reduced 50%