duplicate development in Europe), while the US could profit from using the Kourou launch site. For the final version of a real large SPS transporter it could even be envisaged that development funding can be provided commercially (from banks and power companies) since amortization can easily be achieved for this type of fully reusable cargo vehicle. REFERENCES 1. D.E. Koelle and H.H. Koelle, Future Low-Cost Space Transportation System Analysis, Acta A.v- tronautica 6(1635-1667, 1979. 2. D.E. Koelle, Performance and Cost Analysis for an SSTO + OTV Heavy Cargo Transportation System to Geosync Orbit, Paper 78 A-27, lAF-Congress Dubrovnik, 1978. 3. D.E. Koelle and R.G. Reichert. Europe and Future Space Transportation Systems, Paper 80-097, DGLR/AAS Symposium: Shuttle/Spacelab, Hannover, April 1980.
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