I have seen this plane fly, and it is Smooooothe :-)
It seems to have a very large speed range. It can fly like a park slowflyer, open up the throttle, and its super sonic :-)
I took some picturse of it at Holstebro, and a few movies of it at an other event.
The plane in the movie has a simjet 1200 SP turbine.
Small low quality movies
Speed Pass 300kb :
http://bornholm.adsl.dk/modelfly/fil...superjet/1.WMV
Speed Pass and roll 650kb:
http://bornholm.adsl.dk/modelfly/fil...superjet/2.WMV
Takeoff 720kb :
http://bornholm.adsl.dk/modelfly/fil...superjet/3.WMV
SJ.