Hi there,
I am trying to get a SSTO build working, however I can't figure out how it will accelerate enough to get to orbit. I followed @Matt Lowne build on the beautiful SSTO, however my build will never get fast enough. It stops around 300m/s. So I tried his craft file from the video and it is even worse. ;-)
So now I am stuck on how to go on? Adding engines only gives small increments on the max speed and probably would need 10 more rapiers to hit ~400m/s.
Is it something with