When I got my tail wheel endorsement a few years back, my instructor asserted that you should always have enough altitude to reach the field if you loose your engine during the approach.
That sounds good to me, but I see a number of videos online that do not seem to support this recommendation; that is, they're dragging it in.
I'm not good at math, so I don't know how being on the glide slope, or other altitude aid, (VASI) would compare with the glide angle of the aircraft.
All things considered, do you think "If you can't make the field, you're too low." is a good rule to follow Thanks. ~glen