I would have loved to have seen that thing run. Apparently the prop ran at 3000 RPM...strewth, the old Harvard here at Boscombe Down makes enough racket when they firewall the loud lever and that dont spin the toothpick anywhere near that much !!!
Well, it does have the look of the SAAB Viggen, but that other exhaust is a puzzler, unless it's an auxiliary dump. So, I'll go with Viggen, in a 'low vis' scheme.