Brit312
The way it is stated in the web site its almost like you're getting a free lunch - like the engine delivering only 6% while the rest comes with the territory!
The compresion process as described - a ram air effect - some how, to me at least, suggests a drag force rather than something producing thrust...
btw, you must know all about Proteous engines? Very fond of the 312 myself having spanned the Atlantic ocean on them as a kid.