Dedicated Water Thruster - The Propeller

Chris shared this feedback 2 months ago
Not Enough Votes

Seeing as Atmo Thrusters operate by compressing and accelerating gasses to produce thrust, and water is uncompressible, would it not make more sense to have a propeller as a primary method of movement.


Just a thought

Replies (1)

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Despite appearances, the SE1 atmo thruster is an electric fan (like on a drone) and not a jet engine; provided the SE2 version is waterproof, it should at least provide some thrust underwater, but the optimal blade profile for air and water are different.

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Electric fan motors for atmosphere and for aqueous environments differ in principle only in the speed of rotation.

Basically, it is only a question of how much air or water (in kilograms) and at what output speed the motor can pump from the inlet side to the outlet side.


Chris - The compressibility of air and the "incompressibility" of water are irrelevant - air is "light", so you need to achieve a high discharge velocity to achieve usable momentum. Therefore you need to both compress it and heat it. Water is "a thousand times" denser than air - so you don't need to either compress it or heat it - and you don't need such a high discharge velocity either. You can achieve the necessary Momentum at the outlet with a simple vane pump.


I tried this in another game - Kerbal KSP - and it works great, just swap the medium air for water and a bit of fiddling with the numbers.

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Lets have a few types with different profiles for different purposes.

deepspeed-chart-propeller-hydrojet-propulsion-comparison

I personally like this one a bit.

voith-linear-jet-1

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My ZIL-4906 "Sinaya Ptica" for KSP. Two "waterjets" are behind the rear wheels. The used model is the jet engine from the game.


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Max. speed on water with 2x waterjet ~50km/h (13,7m/s), with whell only~12km/h (3,4m/s)

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Nice duck

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