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SSTO won't break mach barrier


I am attempting to build a relatively low thrust to weight ratio SSTO (about 15.5 tonnes to one Rapier) but I just can't get it to break the mach barrier. The SSTO can get to about 315m/s and about 185kn of thrust but it will go no faster. At takeoff I pitch up to 5 degrees and keep it at about the same angle untill about 5000m but then my velocity starts to drop. I have tried @Rune's White Dart which is heavier than mine but has no trouble breaking the mach barrier.  The only thing I can think it might be is that it only has 2 of the 0.625m air intakes. 

Here is a download link if you need a closer look: http://kerbalx.com/mrmcp1/21

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On 31/01/2016 at 10:58 PM, fourfa said:

You can delete "ion" from your comment too.  RTG for all ships (once researched), FCA as needed, and leave the solar at home.  Haven't had a mission-ending broken solar panel since!

Oh but the price of the buggers! 

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