The reference expendable core space transportation system of the DLR study is the Ariane 5 ECB with cryogenic upper stage, but skipped SRB. The basic requirement is to reach almost the same commercial GTO payload as for the launcher with solid rocket boosters. The replacement of powerful solid rocket-motors by liquid propellant engines requires the utilization of high mass flow engine designs. Such large motors considerably contribute to the total development cost of these space transportation vehicles, if a new lay-out is selected. To obtain a substantial reduction in space transportation price, the employment of existing or derived engines is of high interest.
The following table lists all reusable booster stages investigated by SART so far, sorted by propellant combinations.
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