In article ,
says...
I did not personally hear anyone booing, but I will tell you that it was
a very disappointing performance.
It was a very over hyped event. The name "jetpack" is a gross misnomer.
It is two ducted fans, similar to a project and device that flew in the
US several years ago. It was funded with DARPA money. The prototype was
offered for sale after the initial test flights. Wish I could recall the
name.
It reminds me of the old days of Oshkosh with its unproven performance
statistics, high price, and ambitious but speculative claims.

I am trying to understand how the engine they have developed will
produce the claimed 200 HP.

MythBusters built a similar device last year and failed to achieve the
lift necessary for flight with off the shelf components.

Thanks for the feedback John.

--
Duncan