You conglomerate several concepts that shouldn't be conglomerated. Let's untangle a few concepts first:
Laminar/Turbulent flow in this application refers to the state of the boundary layer around an object. The boundary layer is a thin layer adjacent to the surface from which the flow velocity...
A leeboard does nothing for stability, if anything they decrease it because together with the sail they form the heeling moment. Removing the leeboard actually reduces the heeling moment because the lateral resistance point moves upward (although I wouldn't use that as a method to prevent...
I think you are underestimating how stable a flat bottomed ship actually is, just as an example, this is fine:
These ships have no keel, to be clear.
Also, the height of the center of mass isn't as high as it looks. That there is a lot of volume high up doesn't mean the mass is as well. I...
Yeah, purely sail powered is not gonna fly, I agree with that. There is indeed some over ambitious, economically naive and ridiculously fantastical things going on there...
There is a lot happening in the field for wind assist ships at commercial scale:
There are several attempts for commercialization:
https://www.bbc.com/news/technology-66543643
https://www.econowind.nl/
https://bound4blue.com/
http://www.dealfeng.com/
There are research initiatives with...
I think what he meant a word of caution: "please constrain your problem well enough or engineers will run with it in the direction they think is fun, rather than useful" Because hey, if you can make a trebuchet within the given specs, that's just way more fun :cool:.
There is a new paper in Nature saying that a now vanished branch of the Nile river (dubbed the Ahramat Branch) was much closer to where the Pyramids were build. The branch dried probably thousands of years ago.
So... It wasn't aliens after all...
At my work there was a special room that you could use either to relax in or for new mothers to express milk. The sign said in Dutch:
"kolf ruimte / rust ruimte"
('kolven' meaning 'to express milk', 'ruimte' means 'room' and 'rust' means 'rest', i.e. 'rust ruimte' is a room to rest/relax in)...
I think your reasoning is that the difference in density causes a larger difference in pressure if you increase the height. So (rho_hot*g*h1 - rho_cold*g*h1) < (rho_hot*g*2*h1 - rho_cold*g*2*h1), which on itself is true of course.
The thing is that for equal P0 the temperature and therefore...
You cannot use the full dp due to difference in rho for the turbune power. Because the system has to overcome a small amount of friction as well.
If you don't include that friction it becomes a problem where you do not need any energy at all to keep the flow going (Newton's first). In that...