# Would blade-less (Dyson style) jet engines work? [duplicate]

Is it possible to design an aircraft with blade-less (same concept as Dyson) design to generate thrust?

What are some of the key benefits, drawbacks and examples of attempts (if any) at this kind of design?

Envision the engine/s:

• Are mounted inside the fuselage. E.G. in the cargo area (ofc this means reduced space for cargo)
• Have an intake which allows for air to enter the engine for compression
• Thrust-points are located throughout different point/s of the fuselage/wing

Here are some (faux) examples of what this concept could sort of look like:

It seems like this type of design could reduce drag and therefore improve efficiency. Plus the added benefit of reduced noise and impact of bird strikes.

Here’s an article which explains how Dyson fans work for reference: https://electronics.howstuffworks.com/gadgets/home/dyson-bladeless-fan.htm

• Thing is, the "bladeless" bit is a bunch of marketing BS. There are oodles of blades; they are just hidden inside a housing and are used to create a high velocity stream to pull along a low velocity stream. In other words, an ejector pump. A useful mechanism if you want to move air using a handy motive source that would otherwise be wasted. An extremely inefficient way to accelerate a mass of air for thrust purposes. Jan 2 at 16:17
• The photos showing a superficial resemblance between an empty nacelle and an allegedly bladeless fan, (that actually isn’t) severely hamper the credibility of this question in my opinion. (I.e. it looks like it’s asking “can we just remove the engine and still produce thrust?”) Jan 2 at 18:19
• Oh, kinda funny the preceding dyson fan question has 53 fans (atm). Pun inteded. Jan 3 at 11:43

As stated in many places on this site, thrust T = $$\dot m \cdot \Delta V$$, while the energy expelled E$$_{kin}$$ = $$½ \cdot \dot m \Delta V^2$$. So thrust efficiency is highest when the largest amount of air flow is accelerated least. And this is exactly opposite of what the Dyson fan does.