Sounds like quite a disruptive innovation in the aerospace industry. Always wondered how much it cost to get innovations like this off the ground. $400m funding round sounds pretty serious...
Or by social media standards. I know it's a rather over-used meme now, but I'm again reminded of Instagram's $1b buyout vs. this.
This seems like a good blue-sky venture for a scientific philanthropist. There's a lot that could go wrong, it might not work (though as pointed out elsewhere, this isn't all theory - they have tested the heat exchanger in real life on a proper jet engine), but it could be a big win. If only someone like Gates could put down $400m for a chance of a big pay off later.
