what are you talking about?

[David in Sandusky]

Nautical Mile/statute mile = 6,000 feet/5280 feet = 1.136 = knots/mph.

We use nautical miles because:

60 nautical miles = 1 degree of latitude = 1 degree of longitude at the equator, or

1 nautical mile = 1 minute of latitude.

That is, a nautical mile fits easily into the navigation system of latitude (and longitude, but a degree of longitude approaches zero as you get closer to the North Pole.)

I can do bullards, but that’s enough for tonight.

 

[mcrow33]

How about - when you see a boats displacement. Is that in saltwater or fresh water? Wouldn't a boat displace more water in fresh water then saltwater?

 

[jon hansen]

a great lakes sailor just described ocean miles properly. david, your the man

" if you can sail the great lakes, you can sail anywhere"

 

[Will Gilmore]

How about - when you see a boats displacement. Is that in saltwater or fresh water? Wouldn't a boat displace more water in fresh water then saltwater?

Not if you measure in weight, only in volume or, if you sank your boat, then it displaces more in saltwater, but only in weight.

- Will (Dragonfly)

 

[David in Sandusky]

“Seawater weighs about 64 pounds per cubic foot—on average. "Average" fresh water weighs about 62.2 pounds per cubic foot.“ So, yes, the same boat displaces a higher volume (but same weight) of fresh water than salt water.

 

[jon hansen]

so now google is saying that a nautical mile is 6076. 1 ft. that's new to me. i always used 1.1359 for the conversion so i looked like i knew what i was talking about.. now they saying 1.1508 to 1.

what's correct? and why

 

[JamesG161]

1 nautical mile = 1 minute of latitude.

Is the winner.
But...
He doesn't win the "Demaflichy" because SBO just ran out of inventory on those!

60 nautical miles = 1 degree of latitude = 1 degree of longitude at the equator

60 nautical miles = 1 degree of latitude is a Constant.
Also ≈63 nm for longitudes in most of USA

You can estimate distances between two Lat/Lon points by remembering 60 nm.
Jim...

 

[jon hansen]

hull speed? ALL blow boaters need to understand this dynamic. trawler types too. all 93,000 SBO people should understand this

 

[JamesG161]

hull speed?

On what heel angle? What is the sea state? What is the water temperature? Are you in 20 knot winds off the beam?
Jim...

 

[jon hansen]

what's a flemish flake? saw one on a post here tonight. again, son taught me from boy scouts. kids, what can you do

 

[jon hansen]

On what heel angle? What is the sea state? What is the water temperature? Are you in 20 knot winds off the beam?
Jim...

well, none of that applies to explain the dynamics of hull speed. now, on my old CCA vessel the hull speed can change because of the shape of that old alden hull. BUT, the explanation of the the 'hull speed' dynamic is the same

 

[Stu Jackson]

your

and

you're

They are different.

Heck with the caps. I mean: heck with the caps...

 

[jon hansen]

the hull speed formula is approximately the square root of the the water line times 1.32. but we all need to understand the dynamics of hull speed.

 

[jon hansen]

stu, i need all the help i can get with grammer. mom's gone now and there is no one to help me

 

[dLj]

]You burn more fuel, you make more noise, you do not go much faster.

TRUE but why?[/QUOTE]

I haven't seen an answer to this... Wish I had a pencil, it's a lot easier to draw than explain in words, but here goes. In a displacement hull as you go faster, you start to form a sine wave shaped form of the water under your boat. The top of the sine wave is up near the bow, and the low part of the sine wave is towards the stern. As you approach and exceed your hull speed, the shape of that sine wave increases in amplitude, or the height of the front part gets higher and the low part gets lower. So you boat basically starts going up hill more and more. The stern drops down, the bow goes up, and all you do is burn more fuel, make more noise...etc...

dj

 

[markwbird]

Why do we drive on a parkway and park on a driveway?

 

[JimInPB]

so now google is saying that a nautical mile is 6076. 1 ft. that's new to me. i always used 1.1359 for the conversion so i looked like i knew what i was talking about.. now they saying 1.1508 to 1.

what's correct? and why

is that an international nautical mile? or a us nautical mile? Or an imperial nautical mile?

 

[jon hansen]

dj, your in the neighborhood, sorta, close, well, ....... no! ..... and the explanation needs to also explain how and why you can then calculate any hulls speed

 

[capta]

What's the best thing about baggywrinkles? The baggywrinkle party!

 

[RussC]

Hemorrhoids or asteroids??? The English language is so confusing.