Crest Pre-Flight Report Rich Northrop The University of Chicago September

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Roundsling (SpanSet RCE 240) 21,200 lb. Vertical rated capacity & 5:1 design factor Crosby Swivel Hoist Ring (HR-125) 8,000 lb. rated capacity & 5:1 design factor Crest Flight Rigging Components Crosby Sling Shakle (S-253) 17,500 lb. rated capacity & 5:1 design factor Rev.A RN 5

Gondola Design - Corner Suspension Loading Rule: For multiple-cable suspensions, each cable must have an ultimate strength greater than five times the weight of the payload divided by the sine of the angle that the cable makes with horizontal in a normal flight configuration. Cable terminations, cable attachments, and gondola structural members must be capable of withstanding the load described above. Total suspended load = 6,088 lbs. x 5 divided by sine 60 degrees = 35,150 lbs. 6

Gondola Design - Suspension Loading Rule: A load 10 times the weight of the payload applied vertically at the suspension point. Fixed Point 10 G Body Load Total suspended load = 6,088 lbs. x 10 = 60,880 lbs. 60,880 lbs. divided by 4 = 15, deg. 60 deg. 7

Gondola Corner attachment Bracket 3/8 – 16 Grade 8 Bolts - 10 total Stress area =.0775 sq. in. each Vertical load (each corner) = 35,150 lbs. Bolt shear = 35,150 lbs. /.0775 (10 bolts) = 45,355 psi < 90,000 Ultimate shear 8

Gondola Design - Corner Suspension Loading Rule: A load five times the weight of the payload applied at the suspension point and 45 degrees to the vertical. This load factor must be accounted for in the direction perpendicular to the gondola’s short side, perpendicular to the gondola’s long side, and in the direction of the major rigid support member at the top of the gondola structure. If flexible cable suspension systems are used, they must be able to withstand uneven loading caused by cable buckling. 5 G Weight of gondola 45 deg. Fixed Corner Total suspended load = 6,088 lbs. x 5 = 30,440 lbs. 9

Gondola Corner Framing 10

New slides added on Dec. 8, 2011 for teleconference 11

Image 61 LongColumnT2 Loading reference only 12

Primary Gondola 13

Image 17 CenterBeam Image 14 CenterBeamAngle Image 26 CornerChannelAngle 14

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