If we forget history -we are doomed to repeat it
Good ol Dyson - The vacuum sales huckster. he now wants to sell a update of the venturi vacuum setup
Don't believe it
The FIRST time I saw it use was on dry cleaning pressess from the 194o's Sane thing without the "airplane wing shape thing
if you ever walked by an old dry cleaner shop you would hear the blast of steam coming from a pipe vented out of doors
scary the first time you heard it
Why did the shops stop using it
simple
Extremely inefficent use of steam and desired vacuum flow was weak from the press -which needed flow thru pads and the garment being dried and cooled
The principle was identical to Dyson' "discovery". -blow high pressure thru venturi- creating a low pressure upstream-
The horrible fan blades which chop up the air (sic) are actually the most efficient method of moving air
Look at the bypass fan setup on current heavy lifters .
By the way
The vacuum needed in dry cleaning is now furnished by large flow vacuum units - EFFICIENCY is the key in today's air movement devices.
Even in air conditioners
The high efficiency air conditioning unites move lots of air at the big thing outside the house and at low pressures the pumps are also designed to uses less electric power
basically less compressing power needed and the less heat exchanging power needed - the less $$$electricy is needed
Th Dyson setup would need one incredible high pressure air pump to make it any kind of a usable thrust unit
Here comes the reality part -again
The more you try to increase pressure or speed from the natural state, (rest) The more the power required at an ever increasing RATE. 4x the power needed to double the speed etc..

As a simple example - a lighter aircraft will always perform better than a heavier one - unless you are using gravity to propel it.