An extended Europa.

One obvious way to improve the performance of Europa was to add strap on boosters. Here are the French proposals to do this.
On the left is the liquid fuel booster arrangement, the boostersbeing modified versions of the first stage of the Diamant launcher.
On the right is the solid fuel booster proposal.

Here is another view of the solid fuel boosted Europa:

The all important question is: what would be the payload? The report from SEREB estimated that the solid fuel boosted Europa would be capable of putting 310-360kg in geostationary orbit. A figure quoted for the liquid fuel version was 600-700kg in geostationary orbit.

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