'flat' is an optical illusion in the video Bill posted because I've flown this approach with a 0.33 zoom setting (to have all the instruments in view).
Until the 'transition' the rate of descend is average 900fpm.
The ground speed is 155kts which means that glidepath is even slightly more steep than the standard 3deg.
Furthermore the VASIS are all red because you don't want to cross the threshold at 50ft in the T-38 so the 3deg glidepath is actually 'parallel' to the ILS or visual glideslope.
That of course makes another 'too low' impression.
That was one thing that caused question marks to pop up over my head when watching Bill's video. I kept thinking "how the heck can he keep descending at 700-900 FPM, while being that low the whole time? What sort of magic plane is this?"
:ernae: