For my entry I used only three engines. By letting the nosecone overheat I was able to reach 1640 m/s in air breathing mode,  This greatly reduced the amount of lf/ox I needed to carry.  Last entry i made had 13 oscar b tanks, this one needed only 6. I found that the radial ram intake gave better performance then other intakes, they seam to have better drag/intake air ratio then other intakes. I needed 3 of them to avoid the rapier loosing thrust at 15+ km altitude I made LKO ->
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