The Saturn INT-20 was a proposed intermediate payload follow-on from the Apollo Saturn V launch vehicle. An interstage would be fitted on top of the S-IC stage to support the S-IVB stage so it could be considered either a retrofitted Saturn IB with a more powerful first stage or a stubby cut-down Saturn V without the S-II second stage.Three variants were studied one with three F-1 engines in the first stage one with four and one with five.
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