  The Far Ultraviolet (FUV: hereafter 900-1150 A) is a spectral range which
contains many of the ground state transitions of common elements but has had
limited observational capabilities due to the unique technological requirements
to operate in this waveband. Conceptual designs are presented, for high
resolution (R > 50,000) echelle spectrographs for CubeSat, SMEX and MIDEX
missions, along with comparisons of their performance to past instruments.
