My first post and first large SSTO, all stock! There's some good info on SSTOs here and I'm learning a lot. Have any of you experimented with the "Rhino" engine. I went with it because of the high TWR and ISP. My ship is 198T and the payload is 45T. With the remaining fuel (about 10T) you get over 27% payload. I think one of you who knows more about SSTO design could optimize it much further.