O.k.
guys READ EVERYTHING AGAIN and watch carefully.
This are three(!!) different planes with the same design.

First one is at the VIDEO with a Behotec J66 engine with 75N thrust and the max speed is 395 km/h (246mph). It has a long black canopy. Take off weight is 11lbs. This one flew at the AMT- Jet-Meeting at Porz/Germany with 33° celsius outside air temperatur with approx. 370 km/h. 395km/h was meassured at 6°celsius. I´ve seen Bennys Pulse Jet. 420 is for sure but a loud plane always seem to be faster than a quite turbine plane.

Second plane has a Behotec J66HP engine with 85N thrust. The clamps are just turned around now!! This plane showed at the first meassured flight 455km/h. It is the one a this Homepage: http://lim0707.bei.t-online.de/niels.html
Max speed was 481 km/h(299mph). Take off weight is 11.4lbs

The third one is powered by a Behotec JB130 engine with 140N !!
and has a take off weight off 14lbs. It is at this homepage: www.hessenbruch.de/niels and it is the fastes with 576km/h(358mph)

Look at the colours. I think pink and green are the best colours for flying far away.

Hope it makes everything more clear.

@mikec if the vertical plane would be included then it would be faster.
and no one said that it is for the Guiness Book

Niels