The albatross is the largest spaceplane I dared to make. I created and iterated several times so far: Albatross I: can take off with minimum wingspan Albatross II: increased wingspan. Single ocean flight succeeded. Landing was not. Albatross III: better engine configuration Albatross IV: full delta wingspan. Transcontinental flight across two oceans tested and succeeded. Landing mildly successful Albatross V: converted airplane to spaceplane. Can make it to the Mun Albatross VI: capable of landing on the Mun... backwards... barely. Albatross VII: more balanced RCS thrusters. Trying to land it backwards on the Mun: http://imgur.com/a/019mi Attached is the Mk IV, V, VI, VII. It\'s a little slow on the rise, but it\'s quite stable.