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1

That "any prop" part is the killer. Most people get less thrust from trying that: My experiments suggest only a a max of 20% improvement is possible: It should spin slower (because more of the prop is producing lift, instead of stuck in the vortex at the tips) for the same power. ...


1

No, there isn't. Weight (which is a result of mass and gravity) is not related to mach number (which depends on velocity and the local speed of sound). You are comparing apples and oranges.


3

Yes, they have a limit at around 2. And this can only be achieved at Mach 1, as Peter Kampf points out. Increasing the inlet to diffuser area ratio to extreme values will just lead to your engine being filled with slow moving air. The mass and volume of air in your engine will increase, but neither the pressure nor the rate of airflow will increase ...


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