Navy back to Sextant

[SmithDoor]

When I was starting on my MBA I checked about skipping the math courses: they asked if I used Calculus in my day-to-day work and weren’t amused when I told them, “Nobody uses Calculus in their work.” Other than a waste of time and money (was reimbursed), the Statistics & Matrix Math courses were a nice refresher (no Calculus).

I agree 99% never use Calculus after college

I use Math up to Calculus a lot when working doing engineering.

But I think in reality only about 99% never use Calculus after college.
Most just wast of time.
I have ask license Engineers that question and all said same thing only used algebra.
It is not some ever need.

What did I could not go and buy off the shelf. For my work there no charts or tables for parts
So I had figured out what was need then make the part.
Some parts took up to 5 pages for others to read.
I forgot how many pages a job would have.
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I have look at some jobs that my competitors use through and pray engineering. They heavy plate then why.
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I found in different industry the engineer said they extra heavy to keep the cost of license engineering cost down. Basically he did could not do any engineering but on he had a degree from a college for engineering.
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I never do a job without doing all the engineering first. It one best butt covers any can do.

Dave

 

[SmithDoor]

Large ships use multiple shafts to get the necessary Hp into the water, also for redundancy. Smaller and auxiliary ships typically have one.

Yes, with multiple shafts you can “steer” a ship without using the rudder, but it is not practical for anything other than limping around.

I was to see supper size with screw.
I am say all but I seen just one

Dave

 

[ChazzC]

I was to see supper size with screw.
I am say all but I seen just one

Dave

Cargo ships, like the Dali that struck the Key Bridge, typically have one screw: don’t need quick response or high speeds, just go in straight lines. The Dali displaces 149,000 t, is 984’ long and has 55,630 Hp. In comparison, the USS George H. W. Bush (CVN77) displaces 114,000 t, is 1,040’ long (waterline) and has 260,000 Hp.

 

[SmithDoor]

Cargo ships, like the Dali that struck the Key Bridge, typically have one screw: don’t need quick response or high speeds, just go in straight lines. The Dali displaces 149,000 t, is 984’ long and has 55,630 Hp. In comparison, the USS George H. W. Bush (CVN77) displaces 114,000 t, is 1,040’ long (waterline) and has 260,000 Hp.

CVN has has 65,000 hp per screw.
War ship always have lot more hours power .
The cargo ships are built for fuel economy.

I do not know why on a cargo they only have one screw.

I wonder on a cargo ship if have Sextant for Navigation.
The sextant is a safety equipment if some happens to all other Navigation equipment.

In October when read the article the Navy stop using sextant. Someone very good can find there location in less that mile .

Dave

 

[Nikhil Bhale]

Hi,
I work in merchant navy as engineer. We have sextant onboard. We have gyro compass and magnetic compass onboard too. It is duty of navigating officer to take noon sight everyday at noon to calculate for position. We also have GPS subscription for accurate position keeping.
Ships generally have a 2 stroke main engine which is really big. You can fit only one in most of the ships. Now there are some ships with 2 propellers driven by electric motors or smaller 4 stroke engines.
Some ships don't even have rudder, they have steerable propeller.

Regards
Nikhil

 

[GreenTwin]

I hear a lot of folks say "I never used calculus after college", but if you work as an engineer, then you use the knowledge constantly.

Its like saying "I learned to read in school, but I have never written a book, and so I don't use that skill".
But then you become a chef, and read a book that contains 10,000 recipes.

You most certainly use calculus as an engineer; it is the key to understanding everything you do, and the key that gives you entrance into a huge universe of knowledge that few even know exists.
There is no engineering without calculus, whether you sit around and solve forumulas or not.

People make calculus out to be some sort of black-art/vodoo type magical thing, but it is in many respects just summing area under a curve (integration), or calculating the slope of a tangent point on a curve (differentials).
Calculus is a lot like 3D modeling; very confusing at first, and then one day it all clicks, and you can see the "big picture" of what it is all about, and it becomes a lot easier than you imagined.
.

 

[SmithDoor]

Hi,
I work in merchant navy as engineer. We have sextant onboard. We have gyro compass and magnetic compass onboard too. It is duty of navigating officer to take noon sight everyday at noon to calculate for position. We also have GPS subscription for accurate position keeping.
Ships generally have a 2 stroke main engine which is really big. You can fit only one in most of the ships. Now there are some ships with 2 propellers driven by electric motors or smaller 4 stroke engines.
Some ships don't even have rudder, they have steerable propeller.

Regards
Nikhil

Gyro compass and magnetic compass onboard sounds like aircraft.
Glad to here they a sextant.
I can see why calculators are noon. I guess it was taking noon for your location on the sea.

Any photos?
How does the steering propeller work?

Dave

I hear a lot of folks say "I never used calculus after college", but if you work as an engineer, then you use the knowledge constantly.

Its like saying "I learned to read in school, but I have never written a book, and so I don't use that skill".
But then you become a chef, and read a book that contains 10,000 recipes.

You most certainly use calculus as an engineer; it is the key to understanding everything you do, and the key that gives you entrance into a huge universe of knowledge that few even know exists.
There is no engineering without calculus, whether you sit around and solve forumulas or not.

People make calculus out to be some sort of black-art/vodoo type magical thing, but it is in many respects just summing area under a curve (integration), or calculating the slope of a tangent point on a curve (differentials).
Calculus is a lot like 3D modeling; very confusing at first, and then one day it all clicks, and you can see the "big picture" of what it is all about, and it becomes a lot easier than you imagined.
.

I did use Calculus for my work.
TO many license engineers relied on forums ONLY.
Most engineers in the construction in industry avoid it.

I there so types of engineer that use Calculus.

It is very hand for manufacturing. My brother also use Calculus for his line work he does want me give what he did.
My son took Calculus too he just can see how any one ever use Calculus. I show to him but did get it.

Dave

 

[SmithDoor]

Just think of navigating on the open ocean and making maps for others to use in the 1500's just the equipment list below .Global and maps not shown


How you feel traveling ocean with just this equipment ? . ​

All this we can build in our shop with the engine for ship too.



Compass

Compass for steel ships aka Binnacle. Patented 1854, by John Gray This is also in aircraft, better Compass in cars,trucks and cellphones. In very small.

Speed and odometer
Knots rope sandglass set at 1/2 hour. Simple use drop rope with triangle so does not move water. Flip sandglass over and cout the knots.
The replacement is Speedometer was Invented 1888 but the tachometer was described in 1810 . {If you add a pro/screw on tachometer you have a measuring speed in water} witch is very close the Speedometer. So some of data dates maybe in error

Astrolabe per Sextant

Just think of sailing 1500's

Dave