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/sci/ - Science & Math

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9914968 No.9914968 [Reply] [Original]

Why has this terribly inefficient device been allowed to plague our oceans for nearly 150 years? Why are physicists and engineers so useless?

>> No.9915046
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9915046

>>9914968
>terribly inefficient
[citation needed]

>> No.9916891

>>9914968
MHD too expensive

>> No.9916895

>>9914968
What alternative is there?
Did the Australians revolutionize the propeller just like they revolutionized mathematics?

>> No.9916965
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9916965

>>9915046

>> No.9916967

>>9916895
Ever heard of a jet-ski?

I have no idea if it is more efficient, but there have been jet-boats since at least the 70s.

>> No.9917040
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9917040

>>9916967

>you can propel a 1000 foot long container vessel with a jet-ski motor

>> No.9917085
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9917085

>>9914968
Some of my engineering professors have worked on alternatives that are better and faster, sold some to the US military (I'm from Australia btw).

The boat takes in water from the front and shoots the water at high speed behind it just above water level, gives very good handling and speed, although it's harder to steer them at lower speeds. Pic related

>> No.9917094

it took me scrolling past that image 5 times to realize what it is

>> No.9917120

>>9917094
At first I thought it was a security camera.

>> No.9917435

>>9916891

It's also shit and immensely power-inefficient

>> No.9917564

>>9917085
>The boat takes in water from the front and shoots the water at high speed behind it just above water level
But do the turbines not use propellers too? Also: are they more efficient or just faster?

>> No.9917597

>>9917120
Same. Why the fuck would there be security cameras in the ocean? Dolphins are not going to assault ships, we are not ready yet.

>> No.9917607

>>9914968
There are such things as in-board motors

>> No.9917609

>>9917564
They're supposedly much more efficient, and I'm not sure how they eject the water behind them, possibly turbines with propellors inside. INCAT is a bit careful with how much info they give people like me lmao. All I can say is, if it uses propellors, they aren't external props like in the OP's

>> No.9917783

>>9917040
>Jet-ski motors are the largest jet motors possible.

>> No.9917786

>>9917607
Inboard motors and outboard motors both drive a prop, though.

>> No.9917816

Blue water boats have greater concerns or higher priorities than efficiency. Such as salt water corrosion and constant ship maintenance/upkeep. Props are easy to repair/replace.
Internalized water jet propulsion systems are harder to maintain, and less people know how. Which means if you're stranded at a port and can't find or get a mechanic that specialized in jet propulsion to fix your shit, then you're stuck there forever.