Rim Driven Coreless Thruster running at higher RPMs 

I mean different materials and actively cooled bearings is definitely a possibility, that is what they they do in real jet engines after all

carbon fiber isnt all that exotic anymore, can buy and make at the consumer level, commercial jets use CF blades

@@bigmikeobama5314 Carbon fiber composites aren‘t very good for compression tho, so they prlly wouldn‘t be that good in these blades anyway

You're right, this thing will eat itself at those loads. Just the side guide rollers being loaded with high surface speeds at high pressure and lots of sideways slip all under high dynamic loading via vibrations

Also, for the above suggestion - the blades actuators should be fixed on the spool, powered by electromagnetic induction and operated via RF channel

liquid helium or nitrogen would be a little over kill for this

Or, attempt to do something similar to what the Rolls Royce jet engines do with the shaft which runs up the centre of the engine, using air bearing tech. Place a cowel over the lip and make sure the outer rim and the inner surface of the cowel conforms to a certain shape with either side of the rim being the opposite to each other, then, air pressure alone should maintain the gap.

You should make a device like this and implement all your suggestions.

@@lastofthebest5102 I know a fair bit…access to the tools or the knowledge about how to use them on the other hand…no

Yes done decades ago at Harbor Branch Oceanographic Institute

Please study magnetic brakes. Aluminum spinning inside a magnetic field is literally used to stop trains and stuff. This will NOT reduce drag, it will create whole another circle of hell to engineer around.

Making a central shaft with relatively simple bearings would save a world of complexity while still allowing for the rim driven electric motor design. He could change the pitch of the blades from the center shaft like the pitch on a helicopter tail rotor. It looks cool as heck with a hole in the center, but cool looks are not a replacement for good old common sense.

@@mp6756 like a fenstron

@@ahaffke Exactly that is a great example 👍

This prototype is not running fast enough to provide any meaningful data from a smoke test.

Probably not as ship propellers, as even with the rim spinning, it's going to have drag under water, and massively increase the surface area of a moving part that doesn't actually provide thrust (compared to a stem that holds a traditional propeller). Not to mention if something gets sucked through there and gets caught on the blades, it's going to be a mess to get out, and cause more damage. There's also already something similar to this used in water propulsion, and that is water jet propulsion engines. Another thing about this design is it's not really a strong design for high torque, which is what is needed when pushing a lot of heavy water through a turbine in a stable manner. Water jet propulsion is pretty robust as is, with a solid central crank shaft that drives blades in a design that both sucks in water and also gives it a hard push on its way out, with two different rows of blade types. Keep in mind his design is primarily for low cost high volume for smaller craft. All it really does is invert the way an aircraft turbine is typically designed, where blades are fixed to a central shaft and rotate on it, while this rotates the blades from the outside with a hollow central shaft, which should also allow more unimpeded space for thrust to flow through. And it's really mainly designed to replace propeller driven planes, not jet engines.

Once the flow starts moving there is an entrainment effect that pulls the air through the center. The blade tips at that point are not subject to tip vortices as the air is already moving past them. The entrainment is known for creating a much higher efficiency.

@@petermuller9177 Thanks for the reply! In absolute terms, of course air is rammed trough, but relative to the free stream, is the flow in the hole positive?

www.amca.org/assets/resources/public/pdf/Education%20Modules/AMCA%20210-16.pdf

no

I do, and offered it up to "Design the Future". A horizontal ring 50' in diameter weighing in at 12 tons. Electromagnets drive it, connected to a right angle gear box to the propeller shaft. The gyro force would help stabilize the ship in rough seas. I think what you describe is with higher merit than his current approach. It permits higher rpm without the huge tip mass increase.

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Adam sandler

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