When Glenn spoke to a group of potential investors (which I was somehow a part of) back in 2011 you'd think that they were on the cusp of having a finished product and a stack of orders from the US DOD, a variety of commercial organisations, and dozens of rich people who want a personal aircraft. Technically Martin Jetpack still exists, but it has failed to bring anything to market, despite having millions of dollars poured into the company [1]

I struggle to see how Jetpack Aviation is going to achieve what Glenn and his company failed to do. They don't even have a flying prototype or a physical mockup, only some cool CAD models that look like they were made by some high school kid who's watched Star Wars a few too many times.

Jetpacks and flying motorbikes look cool, but on a practical basis they just aren't useful. They don't fly high enough or fast enough, and they can't operate in high wind or poor weather. For military/government use they aren't suitable and there just aren't enough rich people who want an expensive flying toy to sustain the market.

[0] http://www.martinjetpack.com/

[1] https://www.nzherald.co.nz/business/news/article.cfm?c_id=3&...