John, I noticed the rapid burn of the BTP on that rocket too. It also looks to be fairly windy so this may have been a factor? Certainly didn't give the bloke much time to step back. On the German motors, they do seem to use a multi-stage method in a lot of their designs. I've tried a few over the years. Some give a big core burner thrust and then change to either titanium or big bushy charcoal and sometimes both in a 3 stage effect. Some of the Zink's have a very similar Standard style motor with a big core burn 'whoosh' with a big bushy tail all the way up. A good example of a manufacturer considering the motors to be part of the spectacle rather than just a means to get it up there. I once had a mixed size pack of Weco Hong Kong Nights from Great Northern. Small to medium rockets. They all had charcoal core burners. There's really no need for highly efficient end burners in firework rockets. Not in consumer goods. For me, if you're going to make rockets, they should be as magical as you can make them and it all starts with the motor. These are fireworks after all. Not signal flares. Fireworks should be as Gandalf would make them himself. As Jamie mentions, Funke are really getting there with their rockets.