so i finally made a plane that i kinda like, and it can circumnavigate kerbin with ~40% fuel left cruising above 20 km at ~mach 4 and carry 20 pax
still using 1.3.1 so i can use far
also kerbin's radius seems to be 1000 km instead of 600km
(notice the one excess airbrake i later got rid of)
twin tail version has a tad less delta v than the single tail version
another circumnavigation
rapier engine version that can cruise higher and faster