Mid 1990s at Las Vegas TOC. Noon demo be Bob Violet's crew with 2 BVM DF jets modified for turbines.

Coincidentally, The first time I ever saw a Ducted Fan was also at a Las Vegas TOC...1975 or 1976. Bob Violet doing a noon demo of his Blue Angels A4 Skyhawk. I remember that the engine was not able to idle very well and each landing I witnessed was dead stick.