The first pic shows the various clustered arrangements of SRMs for possible first stage replacements for Saturn IB. Several different configurations were studied, including 3, 4, and 5 motor versions with SRMs with either four or five segments in each motor in the cluster. It would have been interesting to see this study updated to reflect the latest state of the art in SRM's for Titan IV using the 7 segment SRBs clustered for the first stage.

The second pic is the Saturn IB with twin 156 inch SRB's.

The third pic is a scale drawing with all the dimensions for a Saturn IB cargo version with a pair of Titan III UA-1205 120 inch SRB's flanking the core stage.

The fourth pic is a performance chart using the standard S-IVB stage propellant weight as used by the regular Saturn IB and Saturn V. The added first stage thrust and increased payload really calls for an uprated (tank stretched) and strengthened S-IVB stage to optimize the performance.

The fifth and last pic is a performance chart using an uprated and lengthened S-IVB stage to better make use of the additional thrust of the first stage and payload lifting capacity.

Enjoy! OL JR

Attached Thumbnails

         

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